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Chebotarev AS, Ledyaeva VS, Patsap OI, Ivanov AA, Fedotov AB, Belousov VV, Shokhina AG, Lanin AA. Multimodal label-free imaging of murine hepatocellular carcinoma with a subcellular resolution. J Biophotonics 2023; 16:e202300228. [PMID: 37679905 DOI: 10.1002/jbio.202300228] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2023] [Revised: 08/02/2023] [Accepted: 09/05/2023] [Indexed: 09/09/2023]
Abstract
We demonstrate label-free imaging of genetically induced hepatocellular carcinoma (HCC) in a murine model provided by two- and three-photon fluorescence microscopy of endogenous fluorophores excited at the central wavelengths of 790, 980 and 1250 nm and reinforced by second and third harmonic generation microscopy. We show, that autofluorescence imaging presents abundant information about cell arrangement and lipid accumulation in hepatocytes and hepatic stellate cells (HSCs), harmonics generation microscopy provides a versatile tool for fibrogenesis and steatosis study. Multimodal images may be performed by a single ultrafast laser source at 1250 nm falling in tissue transparency window. Various grades of HCC are examined revealing fibrosis, steatosis, liver cell dysplasia, activation of HSCs and hepatocyte necrosis, that shows a great ability of multimodal label-free microscopy to intravital visualization of liver pathology development.
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Affiliation(s)
- Artem S Chebotarev
- Physics Department, M.V. Lomonosov Moscow State University, Moscow, Russia
- Russian Quantum Center, Skolkovo, Russia
| | | | - Olga I Patsap
- Federal Center of Brain Research and Neurotechnologies, Federal Medical-Biological Agency, Moscow, Russia
| | - Anatoli A Ivanov
- Physics Department, M.V. Lomonosov Moscow State University, Moscow, Russia
- Russian Quantum Center, Skolkovo, Russia
| | - Andrei B Fedotov
- Physics Department, M.V. Lomonosov Moscow State University, Moscow, Russia
- Russian Quantum Center, Skolkovo, Russia
| | - Vsevolod V Belousov
- Pirogov Russian National Research Medical University, Moscow, Russia
- Federal Center of Brain Research and Neurotechnologies, Federal Medical-Biological Agency, Moscow, Russia
- M.M. Shemyakin and Yu.A. Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Science, Moscow, Russia
| | - Arina G Shokhina
- Pirogov Russian National Research Medical University, Moscow, Russia
- Federal Center of Brain Research and Neurotechnologies, Federal Medical-Biological Agency, Moscow, Russia
- M.M. Shemyakin and Yu.A. Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Science, Moscow, Russia
| | - Aleksandr A Lanin
- Physics Department, M.V. Lomonosov Moscow State University, Moscow, Russia
- Russian Quantum Center, Skolkovo, Russia
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Savitsky IV, Voronin AA, Stepanov EA, Lanin AA, Fedotov AB. Sub-cycle pulse revealed with carrier-envelope phase control of soliton self-compression in anti-resonant hollow-core fiber. Opt Lett 2023; 48:4468-4471. [PMID: 37656530 DOI: 10.1364/ol.499008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2023] [Accepted: 07/29/2023] [Indexed: 09/03/2023]
Abstract
The influence of the carrier-envelope phase (CEP) of a pump pulse on the multioctave supercontinuum (SC) generation in a gas-filled anti-resonant hollow-core fiber (AR HCF) by soliton self-compression (SSC) has been explored. We have shown an octave-wide third harmonic generation (THG) in the visible-to-near-infrared range during the pulse compression down to a sub-cycle duration. The CEP of a multi-cycle pump pulse provides control of interference between the third harmonic (TH) and the SC that indicates the coherent synthesis of a sub-cycle pulse with a duration of about 0.4 optical cycles and a peak power of more than 2 GW at the fiber output.
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Pochechuev MS, Bilan DS, Fedotov IV, Kelmanson IV, Solotenkov MA, Stepanov EA, Kotova DA, Ivanova AD, Kostyuk AI, Raevskii RI, Lanin AA, Fedotov AB, Belousov VV, Zheltikov AM. Real-time fiber-optic recording of acute-ischemic-stroke signatures. J Biophotonics 2022; 15:e202200050. [PMID: 35654757 DOI: 10.1002/jbio.202200050] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2022] [Revised: 04/24/2022] [Accepted: 05/31/2022] [Indexed: 06/15/2023]
Abstract
We present an experimental framework and methodology for in vivo studies on rat stroke models that enable a real-time fiber-optic recording of stroke-induced hydrogen peroxide and pH transients in ischemia-affected brain areas. Arrays of reconnectable implantable fiber probes combined with advanced optogenetic fluorescent protein sensors are shown to enable a quantitative multisite time-resolved study of oxidative-stress and acidosis buildup dynamics as the key markers, correlates and possible drivers of ischemic stroke. The fiber probes designed for this work provide a wavelength-multiplex forward-propagation channel for a spatially localized, dual-pathway excitation of genetically encoded fluorescence-protein sensors along with a back-propagation channel for the fluorescence return from optically driven fluorescence sensors. We show that the spectral analysis of the fiber-probe-collected fluorescence return provides means for a high-fidelity autofluorescence background subtraction, thus enhancing the sensitivity of real-time detection of stroke-induced transients and significantly reducing measurement uncertainties in in vivo acute-stroke studies as inherently statistical experiments operating with outcomes of multiply repeated measurements on large populations of individually variable animal stroke models.
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Affiliation(s)
| | - Dmitry S Bilan
- M.M. Shemyakin and Yu.A. Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia
- Pirogov Russian National Research Medical University, Moscow, Russia
| | - Ilya V Fedotov
- Physics Department, M.V. Lomonosov Moscow State University, Moscow, Russia
- Department of Physics and Astronomy, Texas A&M University, College Station, Texas, USA
- Russian Quantum Center, Skolkovo, Moscow, Russia
| | - Ilya V Kelmanson
- M.M. Shemyakin and Yu.A. Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia
- Pirogov Russian National Research Medical University, Moscow, Russia
| | - Maxim A Solotenkov
- Physics Department, M.V. Lomonosov Moscow State University, Moscow, Russia
| | - Evgeny A Stepanov
- Physics Department, M.V. Lomonosov Moscow State University, Moscow, Russia
| | - Daria A Kotova
- M.M. Shemyakin and Yu.A. Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia
- Pirogov Russian National Research Medical University, Moscow, Russia
| | - Alexandra D Ivanova
- M.M. Shemyakin and Yu.A. Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia
| | - Alexander I Kostyuk
- M.M. Shemyakin and Yu.A. Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia
- Pirogov Russian National Research Medical University, Moscow, Russia
| | - Roman I Raevskii
- M.M. Shemyakin and Yu.A. Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia
| | - Aleksandr A Lanin
- Physics Department, M.V. Lomonosov Moscow State University, Moscow, Russia
- Russian Quantum Center, Skolkovo, Moscow, Russia
| | - Andrei B Fedotov
- Physics Department, M.V. Lomonosov Moscow State University, Moscow, Russia
- Russian Quantum Center, Skolkovo, Moscow, Russia
- National University of Science and Technology "MISiS", Moscow, Russia
| | - Vsevolod V Belousov
- M.M. Shemyakin and Yu.A. Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia
- Pirogov Russian National Research Medical University, Moscow, Russia
- Federal Center of Brain Research and Neurotechnologies, Federal Medical Biological Agency, Moscow, Russia
| | - Aleksei M Zheltikov
- Department of Physics and Astronomy, Texas A&M University, College Station, Texas, USA
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Lanin AA, Chebotarev AS, Kelmanson IV, Pochechuev MS, Fetisova ES, Bilan DS, Shevchenko EK, Ivanov AA, Fedotov AB, Belousov VV, Zheltikov AM. Single-beam multimodal nonlinear-optical imaging of structurally complex events in cell-cycle dynamics. J Phys Photonics 2021. [DOI: 10.1088/2515-7647/ac159a] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
Abstract
We demonstrate a multimodal nonlinear-optical imaging that combines second- and third-harmonic generation (SHG and THG) with three-photon-excited fluorescence (3PEF) as a means to resolve fine details of the cell structure and trace its transformations throughout structurally complex episodes of cell-cycle dynamics, including the key stages and signatures in cell division. When zoomed in on cell mitosis, this technique enables a high-contrast multimodal imaging of intra- and extracellular signatures of cell division, detecting, via a multiplex, 3PEF/SHG/THG readout, a remarkable diversity of shapes, sizes, and symmetries in a truly single-beam setting, with no need for beam refocusing or field-waveform re-adjustment.
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Pochechuev MS, Lanin AA, Kelmanson IV, Chebotarev AS, Fetisova ES, Bilan DS, Shevchenko EK, Ivanov AA, Fedotov AB, Belousov VV, Zheltikov AM. Multimodal nonlinear-optical imaging of nucleoli. Opt Lett 2021; 46:3608-3611. [PMID: 34329236 DOI: 10.1364/ol.416300] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Accepted: 02/12/2021] [Indexed: 06/13/2023]
Abstract
Multimodal nonlinear microscopy combining third-harmonic generation (THG) with two- and three-photon-excited fluorescence (2PEF and 3PEF) is shown to provide a powerful resource for high-fidelity imaging of nucleoli and nucleolar proteins. We demonstrate that, with a suitably tailored genetically encoded fluorescent stain, the 2PEF/3PEF readout from specific nucleolar proteins can be reliably detected against the extranucleolar 2PEF/3PEF signal, enabling high-contrast imaging of the key nucleolar ribosome biogenesis components, such as fibrillarin. THG is shown to provide a versatile readout for unstained nucleolus imaging in a vast class of biological systems as different as neurons in brain slices and cultured HeLa cells.
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Chebotarev AS, Pochechuev MS, Lanin AA, Kelmanson IV, Kotova DA, Fetisova ES, Panova AS, Bilan DS, Fedotov AB, Belousov VV, Zheltikov AM. Enhanced-contrast two-photon optogenetic pH sensing and pH-resolved brain imaging. J Biophotonics 2021; 14:e202000301. [PMID: 33205577 DOI: 10.1002/jbio.202000301] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2020] [Revised: 10/29/2020] [Accepted: 11/16/2020] [Indexed: 06/11/2023]
Abstract
We present experiments on cell cultures and brain slices that demonstrate two-photon optogenetic pH sensing and pH-resolved brain imaging using a laser driver whose spectrum is carefully tailored to provide the maximum contrast of a ratiometric two-photon fluorescence readout from a high-brightness genetically encoded yellow-fluorescent-protein-based sensor, SypHer3s. Two spectrally isolated components of this laser field are set to induce two-photon-excited fluorescence (2PEF) by driving SypHer3s through one of two excitation pathways-via either the protonated or deprotonated states of its chromophore. With the spectrum of the laser field accurately adjusted for a maximum contrast of these two 2PEF signals, the ratio of their intensities is shown to provide a remarkably broad dynamic range for pH measurements, enabling high-contrast optogenetic deep-brain pH sensing and pH-resolved 2PEF imaging within a vast class of biological systems, ranging from cell cultures to the living brain.
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Affiliation(s)
- Artem S Chebotarev
- Physics Department, International Laser Center, M.V. Lomonosov Moscow State University, Moscow, Russia
| | - Matvei S Pochechuev
- Physics Department, International Laser Center, M.V. Lomonosov Moscow State University, Moscow, Russia
| | - Aleksandr A Lanin
- Physics Department, International Laser Center, M.V. Lomonosov Moscow State University, Moscow, Russia
- Russian Quantum Center, Moscow, Russia
- Kazan Quantum Center, A.N. Tupolev Kazan National Research Technical University, Kazan, Russia
| | - Ilya V Kelmanson
- M.M. Shemyakin and Yu.A. Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia
- Pirogov Russian National Research Medical University, Moscow, Russia
| | - Daria A Kotova
- M.M. Shemyakin and Yu.A. Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia
| | - Elena S Fetisova
- M.M. Shemyakin and Yu.A. Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia
| | - Anastasiya S Panova
- M.M. Shemyakin and Yu.A. Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia
| | - Dmitry S Bilan
- M.M. Shemyakin and Yu.A. Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia
- Pirogov Russian National Research Medical University, Moscow, Russia
| | - Andrei B Fedotov
- Physics Department, International Laser Center, M.V. Lomonosov Moscow State University, Moscow, Russia
- Russian Quantum Center, Moscow, Russia
- Kazan Quantum Center, A.N. Tupolev Kazan National Research Technical University, Kazan, Russia
- National University of Science and Technology "MISiS,", Moscow, Russia
| | - Vsevolod V Belousov
- M.M. Shemyakin and Yu.A. Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia
- Pirogov Russian National Research Medical University, Moscow, Russia
- Federal Center of Brain Research and Neurotechnologies of the Federal Medical Biological Agency, Moscow, Russia
| | - Aleksei M Zheltikov
- Physics Department, International Laser Center, M.V. Lomonosov Moscow State University, Moscow, Russia
- Russian Quantum Center, Moscow, Russia
- Kazan Quantum Center, A.N. Tupolev Kazan National Research Technical University, Kazan, Russia
- Department of Physics and Astronomy, Texas A&M University, College Station, Texas, USA
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Ivanov AA, Martynov GN, Lanin AA, Fedotov AB, Zheltikov AM. High-energy self-mode-locked Cr:forsterite laser near the soliton blowup threshold. Opt Lett 2020; 45:1890-1893. [PMID: 32236025 DOI: 10.1364/ol.384850] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2019] [Accepted: 01/27/2020] [Indexed: 06/11/2023]
Abstract
At the level of peak powers needed for a Kerr-lens mode-locked operation of solid-state soliton short-pulse lasers, a periodic perturbation induced by spatially localized pulse amplification in a laser cavity can induce soliton instability with respect to resonant dispersive-wave radiation, eventually leading to soliton blowup and pulse splitting of the laser output. Here, we present an experimental study of a high-peak-power self-mode-locking Cr:forsterite laser, showing that, despite its complex, explosion-like buildup dynamics, this soliton blowup can be captured and quantitatively characterized via an accurate cavity-dispersion- and gain-resolved analysis of the laser output. We demonstrate that, with a suitable cavity design and finely tailored balance of gain, dispersion, and nonlinearity, such a laser can be operated in a subcritical mode, right beneath the soliton blowup threshold, providing an efficient source of sub-100-fs 15-20 MHz repetition-rate pulses with energies as high as 33 nJ.
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Lanin AA, Chebotarev AS, Pochechuev MS, Kelmanson IV, Kotova DA, Bilan DS, Ermakova YG, Fedotov AB, Ivanov AA, Belousov VV, Zheltikov AM. Two- and three-photon absorption cross-section characterization for high-brightness, cell-specific multiphoton fluorescence brain imaging. J Biophotonics 2020; 13:e201900243. [PMID: 31568649 DOI: 10.1002/jbio.201900243] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2019] [Revised: 09/16/2019] [Accepted: 09/17/2019] [Indexed: 06/10/2023]
Abstract
We demonstrate an accurate quantitative characterization of absolute two- and three-photon absorption (2PA and 3PA) action cross sections of a genetically encodable fluorescent marker Sypher3s. Both 2PA and 3PA action cross sections of this marker are found to be remarkably high, enabling high-brightness, cell-specific two- and three-photon fluorescence brain imaging. Brain imaging experiments on sliced samples of rat's cortical areas are presented to demonstrate these imaging modalities. The 2PA action cross section of Sypher3s is shown to be highly sensitive to the level of pH, enabling pH measurements via a ratiometric readout of the two-photon fluorescence with two laser excitation wavelengths, thus paving the way toward fast optical pH sensing in deep-tissue experiments.
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Affiliation(s)
- Aleksandr A Lanin
- Physics Department, International Laser Center, M.V. Lomonosov Moscow State University, Moscow, Russia
- Russian Quantum Center, Skolkovo, Moscow Region, Russia
| | - Artem S Chebotarev
- Physics Department, International Laser Center, M.V. Lomonosov Moscow State University, Moscow, Russia
| | - Matvei S Pochechuev
- Physics Department, International Laser Center, M.V. Lomonosov Moscow State University, Moscow, Russia
- Kurchatov Institute National Research Center, Moscow, Russia
| | - Ilya V Kelmanson
- M.M. Shemyakin and Yu.A. Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia
- Pirogov Russian National Research Medical University, Moscow, Russia
| | - Daria A Kotova
- M.M. Shemyakin and Yu.A. Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia
| | - Dmitry S Bilan
- M.M. Shemyakin and Yu.A. Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia
- Pirogov Russian National Research Medical University, Moscow, Russia
| | - Yulia G Ermakova
- M.M. Shemyakin and Yu.A. Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia
- European Molecular Biology Laboratory, Heidelberg, Germany
| | - Andrei B Fedotov
- Physics Department, International Laser Center, M.V. Lomonosov Moscow State University, Moscow, Russia
- Russian Quantum Center, Skolkovo, Moscow Region, Russia
| | - Anatoly A Ivanov
- Physics Department, International Laser Center, M.V. Lomonosov Moscow State University, Moscow, Russia
- Photochemistry Centre, Federal Scientific Research Centre "Crystallography and Photonics", Russian Academy of Sciences, Moscow, Russia
| | - Vsevolod V Belousov
- M.M. Shemyakin and Yu.A. Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia
- Pirogov Russian National Research Medical University, Moscow, Russia
| | - Aleksei M Zheltikov
- Physics Department, International Laser Center, M.V. Lomonosov Moscow State University, Moscow, Russia
- Russian Quantum Center, Skolkovo, Moscow Region, Russia
- Kurchatov Institute National Research Center, Moscow, Russia
- Department of Physics and Astronomy, Texas A&M University, College Station, Texas
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Lanin AA, Pochechuev MS, Chebotarev AS, Kelmanson IV, Bilan DS, Kotova DA, Tarabykin VS, Ivanov AA, Fedotov AB, Belousov VV, Zheltikov AM. Cell-specific three-photon-fluorescence brain imaging: neurons, astrocytes, and gliovascular interfaces. Opt Lett 2020; 45:836-839. [PMID: 32058483 DOI: 10.1364/ol.45.000836] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
We present brain imaging experiments on rat cortical areas, demonstrating that, when combined with a suitable high-brightness, cell-specific genetically encoded fluorescent marker, three-photon-excited fluorescence (3PEF), enables subcellular-resolution, cell-specific 3D brain imaging that is fully compatible and readily integrable with other nonlinear-optical imaging modalities, including two-photon-fluorescence and harmonic-generation microscopy. With laser excitation provided by sub-100-fs, 1.25-µm laser pulses, cell-specific 3PEF from astrocytes and their processes detected in parallel with a three-photon-resonance-enhanced third harmonic from blood vessels is shown to enable a high-contrast 3D imaging of gliovascular interfaces.
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Lanin AA, Pochechuev MS, Chebotarev AS, Kelmanson IV, Belousov VV, Zheltikov AM. Nonlinear-optical stain-free stereoimaging of astrocytes and gliovascular interfaces. J Biophotonics 2019; 12:e201800432. [PMID: 30891920 DOI: 10.1002/jbio.201800432] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2018] [Revised: 03/10/2019] [Accepted: 03/17/2019] [Indexed: 06/09/2023]
Abstract
Methods of nonlinear optics provide a vast arsenal of tools for label-free brain imaging, offering a unique combination of chemical specificity, the ability to detect fine morphological features, and an unprecedentedly high, subdiffraction spatial resolution. While these techniques provide a rapidly growing platform for the microscopy of neurons and fine intraneural structures, optical imaging of astroglia still largely relies on filament-protein-antibody staining, subject to limitations and difficulties especially severe in live-brain studies. Once viewed as an ancillary, inert brain scaffold, astroglia are being promoted, as a part of an ongoing paradigm shift in neurosciences, into the role of a key active agent of intercellular communication and information processing, playing a significant role in brain functioning under normal and pathological conditions. Here, we show that methods of nonlinear optics provide a unique resource to address long-standing challenges in label-free astroglia imaging. We demonstrate that, with a suitable beam-focusing geometry and careful driver-pulse compression, microscopy of second-harmonic generation (SHG) can enable a high-resolution label-free imaging of fibrillar structures of astrocytes, most notably astrocyte processes and their endfeet. SHG microscopy of astrocytes is integrated in our approach with nonlinear-optical imaging of red blood cells based on third-harmonic generation (THG) enhanced by a three-photon resonance with the Soret band of hemoglobin. With astroglia and red blood cells providing two physically distinct imaging contrasts in SHG and THG channels, a parallel detection of the second and third harmonics enables a high-contrast, high-resolution, stain-free stereoimaging of gliovascular interfaces in the central nervous system. Transverse scans of the second and third harmonics are shown to resolve an ultrafine texture of blood-vessel walls and astrocyte-process endfeet on gliovascular interfaces with a spatial resolution within 1 μm at focusing depths up to 20 μm inside a brain.
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Affiliation(s)
- Aleksandr A Lanin
- Physics Department, International Laser Center, M.V. Lomonosov Moscow State University, Moscow, Russia
- Russian Quantum Center, Moscow, Russia
| | - Matvei S Pochechuev
- Physics Department, International Laser Center, M.V. Lomonosov Moscow State University, Moscow, Russia
- Kurchatov Institute National Research Center, Moscow, Russia
| | - Artem S Chebotarev
- Physics Department, International Laser Center, M.V. Lomonosov Moscow State University, Moscow, Russia
| | - Ilya V Kelmanson
- M.M. Shemyakin and Yu.A. Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia
| | - Vsevolod V Belousov
- M.M. Shemyakin and Yu.A. Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia
| | - Aleksei M Zheltikov
- Physics Department, International Laser Center, M.V. Lomonosov Moscow State University, Moscow, Russia
- Russian Quantum Center, Moscow, Russia
- Department of Physics and Astronomy, Texas A&M University, College Station, Texas
- Kurchatov Institute National Research Center, Moscow, Russia
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11
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Pochechuev MS, Lanin AA, Kelmanson IV, Bilan DS, Kotova DA, Chebotarev AS, Tarabykin V, Fedotov AB, Belousov VV, Zheltikov AM. Stain-free subcellular-resolution astrocyte imaging using third-harmonic generation. Opt Lett 2019; 44:3166-3169. [PMID: 31199407 DOI: 10.1364/ol.44.003166] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/18/2019] [Accepted: 04/11/2019] [Indexed: 06/09/2023]
Abstract
We demonstrate stain-free, high-contrast, subcellular-resolution imaging of astroglial cells using epi-detected third-harmonic generation (THG). The astrocyte-imaging capability of THG is verified by colocalizing THG images with fluorescence images of astrocytes expressing a genetically encodable fluorescent reporter. We show that THG imaging with an optimized point-spread function can reliably detect significant subcellular features of astrocytes, including cell nuclei, as well as the soma shape and boundaries.
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12
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Lanin AA, Chebotarev AS, Barykina NV, Subach FV, Zheltikov AM. The whither of bacteriophytochrome-based near-infrared fluorescent proteins: Insights from two-photon absorption spectroscopy. J Biophotonics 2019; 12:e201800353. [PMID: 30414251 DOI: 10.1002/jbio.201800353] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2018] [Revised: 11/01/2018] [Accepted: 11/06/2018] [Indexed: 06/08/2023]
Abstract
We present one- and two-photon-absorption fluorescence spectroscopic analysis of biliverdin (BV) chromophore-based single-domain near-infrared fluorescent proteins (iRFPs). The results of these studies are used to estimate the internal electric fields acting on BV inside iRFPs and quantify the electric dipole properties of this chromophore, defining the red shift of excitation and emission spectra of BV-based iRFPs. The iRFP studied in this work is shown to fit well the global diagram of the red-shift tunability of currently available BV-based iRFPs as dictated by the quadratic Stark effect, suggesting the existence of the lower bound for the strongest red shifts attainable within this family of fluorescent proteins. The absolute value of the two-photon absorption (TPA) cross section of a fluorescent calcium sensor based on the studied iRFP is found to be significantly larger than the TPA cross sections of other widely used genetically encodable fluorescent calcium sensors.
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Affiliation(s)
- Aleksandr A Lanin
- Physics Department, International Laser Center, M.V. Lomonosov Moscow State University, Moscow, Russia
- Russian Quantum Center, Skolkovo, Russia
| | - Artem S Chebotarev
- Physics Department, International Laser Center, M.V. Lomonosov Moscow State University, Moscow, Russia
| | - Natalia V Barykina
- INBICST, Moscow Institute of Physics and Technology, Moscow, Russia
- P.K. Anokhin Institute of Normal Physiology, Moscow, Russia
| | - Fedor V Subach
- INBICST, Moscow Institute of Physics and Technology, Moscow, Russia
- Kurchatov Institute National Research Center, Moscow, Russia
| | - Aleksei M Zheltikov
- Physics Department, International Laser Center, M.V. Lomonosov Moscow State University, Moscow, Russia
- Department of Physics and Astronomy, Texas A&M University, College Station, Texas
- Russian Quantum Center, Skolkovo, Russia
- Kurchatov Institute National Research Center, Moscow, Russia
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Lanin AA, Stepanov EA, Mitrofanov AV, Sidorov-Biryukov DA, Fedotov AB, Zheltikov AM. High-order harmonic analysis of anisotropic petahertz photocurrents in solids. Opt Lett 2019; 44:1888-1891. [PMID: 30985767 DOI: 10.1364/ol.44.001888] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2019] [Accepted: 03/04/2019] [Indexed: 06/09/2023]
Abstract
Polarization maps of high-order harmonics are shown to enable a full vectorial characterization of petahertz electron currents generated in a crystalline solid by an ultrashort laser driver. As a powerful resource of this methodology, analysis of energy-momentum dispersion landscapes, defined by the electron band structure, can help identify, as our analysis shows, special directions within the Brillouin zone that can provide a preferable basis for polarization-sensitive high-harmonic mapping of anisotropic petahertz photocurrents in solids.
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14
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Roshchin M, Ermakova YG, Lanin AA, Chebotarev AS, Kelmanson IV, Balaban PM, Zheltikov AM, Belousov VV, Nikitin ES. Thermogenetic stimulation of single neocortical pyramidal neurons transfected with TRPV1-L channels. Neurosci Lett 2018; 687:153-157. [PMID: 30267850 DOI: 10.1016/j.neulet.2018.09.038] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2018] [Revised: 09/18/2018] [Accepted: 09/20/2018] [Indexed: 11/20/2022]
Abstract
Thermogenetics is a promising innovative neurostimulation technique, which enables robust activation of single neurons using thermosensitive cation channels and IR stimulation. The main advantage of IR stimulation compared to conventional visible light optogenetics is the depth of penetration (up to millimeters). Due to physiological limitations, thermogenetic molecular tools for mammalian brain stimulation remain poorly developed. Here, we tested the possibility of employment of this new technique for stimulation of neocortical neurons. The method is based on activation gating of TRPV1-L channels selectively expressed in specific cells. Pyramidal neurons of layer 2/3 of neocortex were transfected at an embryonic stage using a pCAG expression vector and electroporation in utero. Depolarization and spiking responses of TRPV1L+ pyramidal neurons to IR radiation were recorded electrophysiologically in acute brain slices of adult animals with help of confocal visualization. As TRPV1L-expressing neurons are not sensitive to visible light, there were no limitations of the use of this technique with conventional fluorescence imaging. Our experiments demonstrated that the TRPV1-L+ pyramidal neurons preserve their electrical excitability in acute brain slices, while IR radiation can be successfully used to induce single neuronal depolarization and spiking at near physiological temperatures. Obtained results provide important information for adaptation of thermogenetic technology to mammalian brain studies in vivo.
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Affiliation(s)
- Matvey Roshchin
- Institute of Higher Nervous Activity and Neurophysiology RAS, Moscow 117485, Russia
| | - Yulia G Ermakova
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow 17997, Russia
| | - Aleksandr A Lanin
- Physics Department, International Laser Center, M.V. Lomonosov Moscow State University, Moscow 119992, Russia; Russian Quantum Center, ul. Novaya 100, Skolkovo, Moscow Region 143025, Russia
| | - Artem S Chebotarev
- Physics Department, International Laser Center, M.V. Lomonosov Moscow State University, Moscow 119992, Russia
| | - Ilya V Kelmanson
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow 17997, Russia
| | - Pavel M Balaban
- Institute of Higher Nervous Activity and Neurophysiology RAS, Moscow 117485, Russia
| | - Aleksei M Zheltikov
- Physics Department, International Laser Center, M.V. Lomonosov Moscow State University, Moscow 119992, Russia; Russian Quantum Center, ul. Novaya 100, Skolkovo, Moscow Region 143025, Russia; Department of Physics and Astronomy, Texas A&M University, College Station, TX 77843, USA
| | - Vsevolod V Belousov
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow 17997, Russia; Pirogov Russian National Research Medical University, Moscow 117997, Russia; Institute for Cardiovascular Physiology, Georg August University Göttingen, Göttingen, D-37073, Germany
| | - Evgeny S Nikitin
- Institute of Higher Nervous Activity and Neurophysiology RAS, Moscow 117485, Russia.
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Lanin AA, Fedotov IV, Ermakova YG, Sidorov-Biryukov DA, Fedotov AB, Hemmer P, Belousov VV, Zheltikov AM. Fiber-optic electron-spin-resonance thermometry of single laser-activated neurons. Opt Lett 2016; 41:5563-5566. [PMID: 27906239 DOI: 10.1364/ol.41.005563] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Optically detected electron spin resonance in fiber-coupled nitrogen-vacancy (NV) centers of diamond is used to demonstrate a fiber-optic quantum thermometry of individual thermogenetically activated neurons. Laser-induced temperature variations read out from single neurons with the NV-diamond fiber sensor are shown to strongly correlate with the fluorescence of calcium-ion sensors, serving as online indicators of the inward Ca2+ current across the cell membrane of neurons expressing transient receptor potential (TRP) cation channels. Local laser heating above the TRP-channel activation threshold is shown to reproducibly evoke robust action potentials, visualized by calcium-ion-sensor-aided fluorescence imaging and detected as prominent characteristic waveforms in the time-resolved response of fluorescence Ca2+ sensors.
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Voronin AA, Lanin AA, Zheltikov AM. Modeling high-peak-power few-cycle field waveform generation by optical parametric amplification in the long-wavelength infrared. Opt Express 2016; 24:23207-23220. [PMID: 27828386 DOI: 10.1364/oe.24.023207] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Extended coupled-wave analysis of optical parametric chirped-pulse amplification (OPCPA) reveals regimes whereby high-peak-power few-cycle pulses can be generated in the long-wavelength infrared (LWIR) spectral range. Broadband OPCPA in suitable nonlinear crystals pumped at around 2 μm and seeded either through the signal or the idler input is shown to enable the generation of high-power field waveforms with pulse widths shorter than two field cycles within the entire LWIR range.
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Stepanov EA, Lanin AA, Voronin AA, Fedotov AB, Zheltikov AM. Solid-State Source of Subcycle Pulses in the Midinfrared. Phys Rev Lett 2016; 117:043901. [PMID: 27494472 DOI: 10.1103/physrevlett.117.043901] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2015] [Indexed: 06/06/2023]
Abstract
We demonstrate a robust, all-solid-state approach for the generation of microjoule subcycle pulses in the midinfrared through a cascade of carefully optimized parametric-amplification, difference-frequency-generation, spectral-broadening, and chirp-compensation stages. This method of subcycle waveform generation becomes possible due to an unusual, ionization-assisted solid-state pulse self-compression dynamics, where highly efficient spectral broadening is enabled by ultrabroadband four-wave parametric amplification phase matched near the zero-group-velocity wavelength of the material.
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Affiliation(s)
- E A Stepanov
- Physics Department, International Laser Center, M. V. Lomonosov Moscow State University, Moscow 119992, Russia
- Russian Quantum Center, 143025 Skolkovo, Moscow Region, Russia
| | - A A Lanin
- Physics Department, International Laser Center, M. V. Lomonosov Moscow State University, Moscow 119992, Russia
- Russian Quantum Center, 143025 Skolkovo, Moscow Region, Russia
| | - A A Voronin
- Physics Department, International Laser Center, M. V. Lomonosov Moscow State University, Moscow 119992, Russia
- Russian Quantum Center, 143025 Skolkovo, Moscow Region, Russia
| | - A B Fedotov
- Physics Department, International Laser Center, M. V. Lomonosov Moscow State University, Moscow 119992, Russia
- Russian Quantum Center, 143025 Skolkovo, Moscow Region, Russia
| | - A M Zheltikov
- Physics Department, International Laser Center, M. V. Lomonosov Moscow State University, Moscow 119992, Russia
- Russian Quantum Center, 143025 Skolkovo, Moscow Region, Russia
- Department of Physics and Astronomy, Texas A&M University, College Station, Texas 77843, USA
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Malevich PN, Maurer R, Kartashov D, Ališauskas S, Lanin AA, Zheltikov AM, Marangoni M, Cerullo G, Baltuška A, Pugžlys A. Stimulated Raman gas sensing by backward UV lasing from a femtosecond filament. Opt Lett 2015; 40:2469-2472. [PMID: 26030534 DOI: 10.1364/ol.40.002469] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We perform a proof-of-principle demonstration of chemically specific standoff gas sensing, in which a coherent stimulated Raman signal is detected in the direction anticollinear to a two-color laser excitation beam traversing the target volume. The proposed geometry is intrinsically free space as it does not involve back-scattering (reflection) of the signal or excitation beams at or behind the target. A beam carrying an intense mid-IR femtosecond (fs) pulse and a parametrically generated picosecond (ps) UV Stokes pulse is fired in the forward direction. A fs filament, produced by the intense mid-IR pulse, emits a backward-propagating narrowband ps laser pulse at the 337 and 357 nm transitions of excited molecular nitrogen, thus supplying a counter-propagating Raman pump pulse. The scheme is linearly sensitive to species concentration and provides both transverse and longitudinal spatial resolution.
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Lanin AA, Voronin AA, Stepanov EA, Fedotov AB, Zheltikov AM. Multioctave, 3-18 μm sub-two-cycle supercontinua from self-compressing, self-focusing soliton transients in a solid. Opt Lett 2015; 40:974-977. [PMID: 25768160 DOI: 10.1364/ol.40.000974] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Strongly coupled nonlinear spatiotemporal dynamics of ultrashort mid-infrared pulses undergoing self-focusing simultaneously with soliton self-compression in an anomalously dispersive, highly nonlinear solid semiconductor is shown to enable the generation of multioctave supercontinua with spectra spanning the entire mid-infrared range and compressible to subcycle pulse widths. With 7.9 μm, 150 fs, 2 μJ, 1 kHz pulses used as a driver, 1.2 cycle pulses of mid-infrared supercontinuum radiation with a spectrum spanning the range of wavelengths from 3 to 18 μm were generated in a 5 mm GaAs plate. Further compression of these pulses to subcycle pulse widths is possible through compensation of the residual phase shift.
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Lanin AA, Voronin AA, Stepanov EA, Fedotov AB, Zheltikov AM. Frequency-tunable sub-two-cycle 60-MW-peak-power free-space waveforms in the mid-infrared. Opt Lett 2014; 39:6430-6433. [PMID: 25490486 DOI: 10.1364/ol.39.006430] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
A physical scenario whereby freely propagating mid-infrared pulses can be compressed to pulse widths close to the field cycle is identified. Generation of tunable few-cycle pulses in the wavelength range from 4.2 to 6.8 μm is demonstrated at a 1-kHz repetition rate through self-focusing-assisted spectral broadening in a normally dispersive, highly nonlinear semiconductor material, followed by pulse compression in the regime of anomalous dispersion, where the dispersion-induced phase shift is finely tuned by adjusting the overall thickness of anomalously dispersive components. Sub-two-cycle pulses with a peak power up to 60 MW are generated in the range of central wavelengths tunable from 5.9 to 6.3 μm.
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Ivanov AA, Voronin AA, Lanin AA, Sidorov-Biryukov DA, Fedotov AB, Zheltikov AM. Pulse-width-tunable 0.7 W mode-locked Cr: forsterite laser. Opt Lett 2014; 39:205-208. [PMID: 24562107 DOI: 10.1364/ol.39.000205] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
A mode-locked chromium forsterite laser with output power in excess of 0.7 W, a central wavelength of 1.25 μm, a pulse repetition rate of 29 MHz, and an output pulse-width-tunable from 40 to 200 fs is demonstrated. The dynamics behind the buildup of ultrashort light pulses in this laser is shown to involve spectral and temporal breathing due to the interplay of gain, Kerr nonlinearity, and dispersion effects. The pulse-width-tunable 1.25 μm output delivered by the developed laser source suggests a powerful tool for nonlinear-optical bio-imaging and offers an advantageous front end for extreme-power laser technologies.
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Lanin AA, Fedotov AB, Zheltikov AM. Broadly wavelength- and pulse width-tunable high-repetition rate light pulses from soliton self-frequency shifting photonic crystal fiber integrated with a frequency doubling crystal. Opt Lett 2012; 37:3618-3620. [PMID: 22940968 DOI: 10.1364/ol.37.003618] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Soliton self-frequency shift (SSFS) in a photonic crystal fiber (PCF) pumped by a long-cavity mode-locked Cr:forsterite laser is integrated with second harmonic generation (SHG) in a nonlinear crystal to generate ultrashort light pulses tunable within the range of wavelengths from 680 to 1800 nm at a repetition rate of 20 MHz. The pulse width of the second harmonic output is tuned from 70 to 600 fs by varying the thickness of the nonlinear crystal, beam-focusing geometry, and the wavelength of the soliton PCF output. Wavelength-tunable pulses generated through a combination of SSFS and SHG are ideally suited for coherent Raman microspectroscopy at high repetition rates, as verified by experiments on synthetic diamond and polystyrene films.
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Affiliation(s)
- Aleksandr A Lanin
- Physics Department, International Laser Center, MV Lomonosov Moscow State University, Moscow 119992, Russia
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Malevich PN, Kartashov D, Pu Z, Ališauskas S, Pugžlys A, Baltuška A, Giniūnas L, Danielius R, Lanin AA, Zheltikov AM, Marangoni M, Cerullo G. Ultrafast-laser-induced backward stimulated Raman scattering for tracing atmospheric gases. Opt Express 2012; 20:18784-18794. [PMID: 23038518 DOI: 10.1364/oe.20.018784] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
By combining tunable broadband pulse generation with the technique of nonlinear spectral compression we demonstrate a prototype scheme for highly selective detection of air molecules by backward stimulated Raman scattering. The experimental results allow to extrapolate the laser parameters required for standoff sensing based on the recently demonstrated backward atmospheric lasing.
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Affiliation(s)
- P N Malevich
- Photonics Institute Vienna University of Technology, Vienna, Austria
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24
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Lanin AA, Fedotov AB, Zheltikov AM. Ultrafast three-dimensional submicrometer-resolution readout of coherent optical-phonon oscillations with shaped unamplified laser pulses at 20 MHz. Opt Lett 2012; 37:1508-1510. [PMID: 22555720 DOI: 10.1364/ol.37.001508] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
An ultrafast three-dimensional readout of coherent optical-phonon oscillations from a diamond film is demonstrated using temporally and spectrally shaped ultrashort laser pulses, delivered by a compact, oscillator-only laser system. This system integrates a long-cavity ytterbium-fiber-laser-pumped 30 fs Cr:forsterite oscillator with a photonic-crystal-fiber soliton frequency shifter and a periodically poled lithium niobate spectrum compressor, providing coherent Raman excitation and time-delayed interrogation of optical phonons in diamond at a 20 MHz repetition rate with a submicrometer spatial resolution.
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Affiliation(s)
- Aleksandr A Lanin
- Russian Quantum Center, Physics Department, MV Lomonosov Moscow State University, Moscow, Russia
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Lanin AA, Voronin AA, Sokolov VI, Fedotov IV, Fedotov AB, Akhmanov AS, Panchenko VY, Zheltikov AM. Slow light on a printed circuit board. Opt Lett 2011; 36:1788-1790. [PMID: 21593891 DOI: 10.1364/ol.36.001788] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Slow-light effects induced by stimulated Raman scattering in polymer waveguides on a printed circuit board are shown to enable a widely tunable delay of broadband optical signals, suggesting an advantageous platform for optical information processing and ultrafast optical waveform transformation.
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Affiliation(s)
- Aleksandr A Lanin
- Physics Department, International Laser Center, M.V. Lomonosov Moscow State University, Moscow, 119992, Russia
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Lanin AA, Fedotov IV, Sokolov VI, Fedotov AB, Akhmanov AS, Panchenko VY, Zheltikov AM. Stimulated Raman amplification and high-order Raman sideband generation in a polymer waveguide on a printed circuit. Opt Lett 2010; 35:3976-3978. [PMID: 21124584 DOI: 10.1364/ol.35.003976] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The ultrafast Raman response of C-H vibrations in polymer waveguides on a printed circuit is shown to enable a high-gain amplification and high-order stimulated Raman transformation of ultrashort laser pulses. The pump and Stokes fields coupled by the C-H vibration mode with a vibration cycle of 11 fs give rise to multiple Raman sidebands, suggesting the way toward ultrafast optical data processing and few-cycle optical waveform synthesis on a printed-circuit polymer waveguide platform.
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Affiliation(s)
- A A Lanin
- Physics Department, M. V. Lomonosov Moscow State University, Moscow 119992, Russia
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Savvin AD, Lanin AA, Voronin AA, Fedotov AB, Zheltikov AM. Coherent anti-Stokes Raman metrology of phonons powered by photonic-crystal fibers. Opt Lett 2010; 35:919-921. [PMID: 20364169 DOI: 10.1364/ol.35.000919] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Coherent anti-Stokes Raman scattering (CARS) is used to measure the amplitude, the dephasing lifetime, and parameters of optical nonlinearities of optical phonons in a synthetic diamond film. A compact CARS apparatus demonstrated in this work relies on the use of an unamplified 70 fs 340 mW Cr:forsterite laser output and photonic-crystal fibers optimized for the generation of wavelength-tunable Stokes field and the spectral compression of the probe pulse.
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Affiliation(s)
- A D Savvin
- Physics Department, International Laser Center, M.V. Lomonosov Moscow State University, Moscow 119992, Russia
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