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Kosareva O, Panov N, Shipilo D, Mokrousova D, Nikolaeva I, Mitina E, Koribut A, Reutov A, Rizaev G, Couairon A, Houard A, Skryabin D, Saletskiy A, Savel'ev A, Seleznev L, Ionin A, Chin SL. Postfilament supercontinuum on 100 m path in air. OPTICS LETTERS 2021; 46:1125-1128. [PMID: 33649673 DOI: 10.1364/ol.416224] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2020] [Accepted: 01/26/2021] [Indexed: 06/12/2023]
Abstract
Pulses at 744 nm with 90 fs duration, 6 mJ energy, and a weakly divergent wavefront propagate for more than 100 m and generate a filament followed by an unprecedently long high intensity (≥1TW/cm2) light channel. Over a 20 m long sub-section of this channel, the pulse energy is transferred continuously to the infrared wing, forming spectral humps that extend up to 850 nm. From 3D+time carrier-resolved simulations of 100 m pulse propagation, we show that spectral humps indicate the formation of a train of femtosecond pulses appearing at a predictable position in the propagation path.
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Shutova M, Shutov AD, Zhdanova AA, Thompson JV, Sokolov AV. Coherent Raman Generation Controlled by Wavefront Shaping. Sci Rep 2019; 9:1565. [PMID: 30733515 PMCID: PMC6367464 DOI: 10.1038/s41598-018-38302-y] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2018] [Accepted: 12/21/2018] [Indexed: 12/03/2022] Open
Abstract
We investigate the possibility of tailoring coherent Raman generated spectra via adaptive wavefront optimization. Our technique combines a spatial light modulator and a spectrometer providing a feedback loop. The algorithm is capable of controlling the Raman generation, producing broader spectra and an improved overall efficiency, and increasing the intensity of high-order sidebands. Moreover, by wavefront optimization we can extend the generated spectra towards the blue spectral region and increase the total power of generated sidebands. Mutual coherence and equal frequency separation of the multiple Raman sidebands are of interest for the synthesis of ultrashort light pulses with the total spectral bandwidth extending over ultraviolet, visible and near-infrared wavelengths.
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Affiliation(s)
- Mariia Shutova
- Institute for Quantum Science and Engineering, Department of Physics and Astronomy, Texas A&M University, College Station, TX, 77843-4242, USA.
| | - Anton D Shutov
- Institute for Quantum Science and Engineering, Department of Physics and Astronomy, Texas A&M University, College Station, TX, 77843-4242, USA
| | - Alexandra A Zhdanova
- Institute for Quantum Science and Engineering, Department of Physics and Astronomy, Texas A&M University, College Station, TX, 77843-4242, USA
| | - Jonathan V Thompson
- Institute for Quantum Science and Engineering, Department of Physics and Astronomy, Texas A&M University, College Station, TX, 77843-4242, USA
| | - Alexei V Sokolov
- Institute for Quantum Science and Engineering, Department of Physics and Astronomy, Texas A&M University, College Station, TX, 77843-4242, USA
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Suhaimi NS, Ohae C, Gavara T, Nakagawa K, Hong FL, Katsuragawa M. Generation of five phase-locked harmonics by implementing a divide-by-three optical frequency divider. OPTICS LETTERS 2015; 40:5802-5805. [PMID: 26670516 DOI: 10.1364/ol.40.005802] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We report the generation of five phase-locked harmonics, f₁:2403 nm, f₂:1201 nm, f₃:801 nm, f₄:600 nm, and f₅:480 nm with an exact frequency ratio of 1:2:3:4:5 by implementing a divide-by-three optical frequency divider in the high harmonic generation process. All five harmonics are generated coaxially with high phase coherence in time and space, which are applicable for various practical uses.
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Hoffmann A, Zürch M, Gräfe M, Spielmann C. Spectral broadening and compression of sub-millijoule laser pulses in hollow-core fibers filled with sulfur hexafluoride. OPTICS EXPRESS 2014; 22:12038-12045. [PMID: 24921323 DOI: 10.1364/oe.22.012038] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Spectral broadening in gas-filled hollow-core fibers is discussed for sulfur hexafluoride, a molecular gas with Raman activity. Experimental results for compressed pulses are presented for input pulses longer than the Raman period and shorter than the dephasing time at a central wavelength of 800 nm and 400 nm, respectively. For both wavelengths we compress the pulses by a factor of three and maintain a good pulse quality. The obtained results are of interest for compressing pulses generated with Yb doped lasers.
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Wirth A, Hassan MT, Grguraš I, Gagnon J, Moulet A, Luu TT, Pabst S, Santra R, Alahmed ZA, Azzeer AM, Yakovlev VS, Pervak V, Krausz F, Goulielmakis E. Synthesized Light Transients. Science 2011; 334:195-200. [DOI: 10.1126/science.1210268] [Citation(s) in RCA: 483] [Impact Index Per Article: 37.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Affiliation(s)
- A. Wirth
- Max-Planck-Institut für Quantenoptik (MPQ), Hans-Kopfermann-Strasse 1, D-85748 Garching, Germany
| | - M. Th. Hassan
- Max-Planck-Institut für Quantenoptik (MPQ), Hans-Kopfermann-Strasse 1, D-85748 Garching, Germany
- Department of Physics and Astronomy, King Saud University, Riyadh 11451, Kingdom of Saudi Arabia
| | - I. Grguraš
- Max-Planck-Institut für Quantenoptik (MPQ), Hans-Kopfermann-Strasse 1, D-85748 Garching, Germany
| | - J. Gagnon
- Max-Planck-Institut für Quantenoptik (MPQ), Hans-Kopfermann-Strasse 1, D-85748 Garching, Germany
| | - A. Moulet
- Max-Planck-Institut für Quantenoptik (MPQ), Hans-Kopfermann-Strasse 1, D-85748 Garching, Germany
| | - T. T. Luu
- Max-Planck-Institut für Quantenoptik (MPQ), Hans-Kopfermann-Strasse 1, D-85748 Garching, Germany
| | - S. Pabst
- Center for Free-Electron Laser Science, Deutsches Elektronen Synchrotron, Notkestrasse 85, 22607 Hamburg, Germany
- Department of Physics, University of Hamburg, Jungiusstrasse 9, 20355 Hamburg, Germany
| | - R. Santra
- Center for Free-Electron Laser Science, Deutsches Elektronen Synchrotron, Notkestrasse 85, 22607 Hamburg, Germany
- Department of Physics, University of Hamburg, Jungiusstrasse 9, 20355 Hamburg, Germany
| | - Z. A. Alahmed
- Department of Physics and Astronomy, King Saud University, Riyadh 11451, Kingdom of Saudi Arabia
| | - A. M. Azzeer
- Department of Physics and Astronomy, King Saud University, Riyadh 11451, Kingdom of Saudi Arabia
| | - V. S. Yakovlev
- Max-Planck-Institut für Quantenoptik (MPQ), Hans-Kopfermann-Strasse 1, D-85748 Garching, Germany
- Department für Physik, Ludwig-Maximilians-Universität (LMU), Am Coulombwall 1, D-85748 Garching, Germany
| | - V. Pervak
- Department für Physik, Ludwig-Maximilians-Universität (LMU), Am Coulombwall 1, D-85748 Garching, Germany
| | - F. Krausz
- Max-Planck-Institut für Quantenoptik (MPQ), Hans-Kopfermann-Strasse 1, D-85748 Garching, Germany
- Department für Physik, Ludwig-Maximilians-Universität (LMU), Am Coulombwall 1, D-85748 Garching, Germany
| | - E. Goulielmakis
- Max-Planck-Institut für Quantenoptik (MPQ), Hans-Kopfermann-Strasse 1, D-85748 Garching, Germany
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7
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Suzuki T, Katsuragawa M. Femtosecond ultrashort pulse generation by addition of positive material dispersion. OPTICS EXPRESS 2010; 18:23088-23094. [PMID: 21164650 DOI: 10.1364/oe.18.023088] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
We demonstrate femtosecond ultrashort pulse generation by adding further positive group velocity dispersion (GVD) to compensate for the presence of positive GVD. The idea is based on the integer temporal Talbot phenomenon. The broad Raman sidebands with a frequency spacing of 10.6 THz are compressed to form a train of Fourier-transform-limited pulses by passing the sidebands through a device made of dispersive material of variable thickness.
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Affiliation(s)
- Takayuki Suzuki
- Department of Applied Physics and Chemistry, The University of Electro-Communications, 1-5-1 Chofugaoka, Chofu-shi, Tokyo, Japan
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8
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Wiederhecker GS, Brenn A, Fragnito HL, Russell PSJ. Coherent control of ultrahigh-frequency acoustic resonances in photonic crystal fibers. PHYSICAL REVIEW LETTERS 2008; 100:203903. [PMID: 18518538 DOI: 10.1103/physrevlett.100.203903] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2007] [Revised: 03/05/2008] [Indexed: 05/26/2023]
Abstract
Ultrahigh frequency acoustic resonances (approximately 2 GHz) trapped within the glass core (approximately 1 microm diameter) of a photonic crystal fiber are selectively excited through electrostriction using laser pulses of duration 100 ps and energy 500 pJ. Using precisely timed sequences of such driving pulses, we achieve coherent control of the acoustic resonances by constructive or destructive interference, demonstrating both enhancement and suppression of the vibrations. A sequence of 27 resonantly-timed pulses provides a 100-fold increase in the amplitude of the vibrational mode. The results are explained and interpreted using a semianalytical theory, and supported by precise numerical simulations of the complex light-matter interaction.
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Affiliation(s)
- G S Wiederhecker
- Max-Planck Research Group (IOIP), University of Erlangen-Nuremberg, Guenther-Scharowsky Str. 1/Bau 24, Erlangen 91058, Germany
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9
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Chen WJ, Hsieh ZM, Huang SW, Su HY, Lai CJ, Tang TT, Lin CH, Lee CK, Pan RP, Pan CL, Kung AH. Sub-single-cycle optical pulse train with constant carrier envelope phase. PHYSICAL REVIEW LETTERS 2008; 100:163906. [PMID: 18518202 DOI: 10.1103/physrevlett.100.163906] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2007] [Indexed: 05/26/2023]
Abstract
We describe the synthesis of periodic waveforms consisting of a train of pulses that are 0.83 cycles long and have an electric field pulse width of 0.44 fs using 7 Raman sidebands generated by molecular modulation in H2. We verify by optical correlation that the carrier-envelope phase is constant in these waveforms when they are synthesized from commensurate sidebands. The estimated overall shift of the carrier-envelope phase is less than 0.18 cycles from the first to the last pulse of nearly 10(6) pulses in the pulse train.
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Affiliation(s)
- Wei-Jan Chen
- Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei, Taiwan
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10
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Gorbach AV, Skryabin DV. Cascaded generation of multiply charged optical vortices and spatiotemporal helical beams in a Raman medium. PHYSICAL REVIEW LETTERS 2007; 98:243601. [PMID: 17677963 DOI: 10.1103/physrevlett.98.243601] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2006] [Indexed: 05/16/2023]
Abstract
Using an example of a Raman active medium we describe how a common nonlinear process of four-wave mixing can be used to induce strong coupling between the spatial and temporal degrees of freedom in optical waves. This coupling produces several unexpected effects. Amongst those are cascaded excitation of multiply charged optical vortices, spatial focusing in a nonlinearly defocusing medium, and generation of helically shaped spatiotemporal optical solitons.
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Affiliation(s)
- A V Gorbach
- Centre for Photonics and Photonic Materials, Department of Physics, University of Bath, Bath BA2 7AY, United Kingdom
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12
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Nazarkin A. Nonlinear optics of intense attosecond light pulses. PHYSICAL REVIEW LETTERS 2006; 97:163904. [PMID: 17155397 DOI: 10.1103/physrevlett.97.163904] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2006] [Indexed: 05/12/2023]
Abstract
The interaction of an intense light pulse of "subatomic" duration with a system of multiple discrete quantum states is analyzed. The nonperturbative character of the response to the pulse field leading to an efficient conversion into high order harmonics is predicted. The spatial-temporal evolution of the field is shown to obey a generalized nonlinear wave equation of the double-sine-Gordon type. In addition to the solitary wave structures, it predicts a nontrivial regime of pulse amplification accompanied by extreme temporal self-contraction of the amplified field.
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Affiliation(s)
- Alexander Nazarkin
- Fachbereich Physik, Universität Kassel, Heinrich-Plett-Strasse 40, Germany
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13
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Sensarn S, Goda SN, Yin GY, Harris SE. Molecular modulation in a hollow fiber. OPTICS LETTERS 2006; 31:2836-8. [PMID: 16969394 DOI: 10.1364/ol.31.002836] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
We report the extension of the technique of molecular modulation to a deuterium-filled optical fiber. Using driving lasers at 807 and 1064 nm, each with a pulse energy of several millijoules and a 200 microm diameter fiber with a length of 22.5 cm, we generate 12 sidebands with wavelengths spanning 1.56 microm to 254 nm.
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Affiliation(s)
- S Sensarn
- Edward L. Ginzton Laboratory, Stanford University, Stanford, California 94305, USA.
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14
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Radeonychev YV, Tokman MD, Litvak AG, Kocharovskaya O. Acoustically induced transparency in optically dense resonance medium. PHYSICAL REVIEW LETTERS 2006; 96:093602. [PMID: 16606263 DOI: 10.1103/physrevlett.96.093602] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/10/2002] [Indexed: 05/08/2023]
Abstract
It is shown that mechanical vibration (acoustical oscillation) of a solid medium along the propagation of multifrequency laser radiation enables one to control the resonant absorption. There exists an optimal spectral structure of the incident field dependent on vibration amplitude as well as the number and intensity of the frequency components that provides the full resonant transparency. A mechanism of the transparency is discussed. Transparency of this kind is shown to appear also via adiabatic modulation of the atomic transition frequency by an external microwave field.
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Affiliation(s)
- Y V Radeonychev
- Institute of Applied Physics, Russian Academy of Science, 46 Ulyanov Street, 603950 Nizhny Novgorod, Russia
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15
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Goda SN, Shverdin MY, Walker DR, Harris SE. Measurement of Fourier-synthesized optical waveforms. OPTICS LETTERS 2005; 30:1222-4. [PMID: 15943316 DOI: 10.1364/ol.30.001222] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
Following the experiments of Shverdin and colleagues [Phys. Rev. Lett. 94, 033904 (2005)], we describe a technique for determining the temporal envelope of an optical beam whose spectrum consists of n discrete, equally spaced frequency components. Four-wave mixing is employed to generate n-1 higher-frequency sidebands. The relative intensities of these sidebands, together with the intensities of the incident side-bands, determine the unknown relative phases of the incident beam.
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Affiliation(s)
- S N Goda
- Edward L. Ginzton Laboratory, Stanford University, Stanford, California 94305, USA.
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Shverdin MY, Walker DR, Yavuz DD, Yin GY, Harris SE. Generation of a single-cycle optical pulse. PHYSICAL REVIEW LETTERS 2005; 94:033904. [PMID: 15698269 DOI: 10.1103/physrevlett.94.033904] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2004] [Indexed: 05/24/2023]
Abstract
We make use of coherent control of four-wave mixing to the ultraviolet as a diagnostic and describe the generation of a periodic optical waveform where the spectrum is sufficiently broad that the envelope is approximately a single-cycle in length, and where the temporal shape of this envelope may be synthesized by varying the coefficients of a Fourier series. Specifically, using seven sidebands, we report the generation of a train of single-cycle optical pulses with a pulse width of 1.6 fs, a pulse separation of 11 fs, and a peak power of 1 MW.
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Affiliation(s)
- M Y Shverdin
- Edward L. Ginzton Laboratory, Stanford University, Stanford, California 94305, USA
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17
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Goulielmakis E, Uiberacker M, Kienberger R, Baltuska A, Yakovlev V, Scrinzi A, Westerwalbesloh T, Kleineberg U, Heinzmann U, Drescher M, Krausz F. Direct Measurement of Light Waves. Science 2004; 305:1267-9. [PMID: 15333834 DOI: 10.1126/science.1100866] [Citation(s) in RCA: 165] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
The electromagnetic field of visible light performs approximately 10(15) oscillations per second. Although many instruments are sensitive to the amplitude and frequency (or wavelength) of these oscillations, they cannot access the light field itself. We directly observed how the field built up and disappeared in a short, few-cycle pulse of visible laser light by probing the variation of the field strength with a 250-attosecond electron burst. Our apparatus allows complete characterization of few-cycle waves of visible, ultraviolet, and/or infrared light, thereby providing the possibility for controlled and reproducible synthesis of ultrabroadband light waveforms.
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Affiliation(s)
- E Goulielmakis
- Institut für Photonik, Technische Universität Wien, Gusshausstrasse 27, A-1040 Wien, Austria
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18
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Sali E, Mendham KJ, Tisch JWG, Halfmann T, Marangos JP. High-order stimulated Raman scattering in a highly transient regime driven by a pair of ultrashort pulses. OPTICS LETTERS 2004; 29:495-497. [PMID: 15005204 DOI: 10.1364/ol.29.000495] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
We demonstrate efficient generation of high-order anti-Stokes Raman sidebands in a highly transient regime, using a pair of approximately 100-fs laser pulses tuned to Raman resonance with vibrational transitions in methane or hydrogen. The use of this technique looks promising for efficient subfemtosecond pulse generation.
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Affiliation(s)
- Emiliano Sali
- Blackett Laboratory, Imperial College London, London SW7 2BW, UK.
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19
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Otsuka H, Uchimura T, Imasaka T. Phase locking in four-wave Raman mixing for generation of an ultrashort laser pulse. OPTICS LETTERS 2004; 29:400-402. [PMID: 14971766 DOI: 10.1364/ol.29.000400] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The emission lines generated by four-wave Raman mixing were coherently phased and provided an approximately 30-fs pulse without any loss of energy simply by passage of the pulse beam through molecular hydrogen.
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Affiliation(s)
- Hiroyuki Otsuka
- Department of Applied Chemistry, Graduate School of Engineering, Kyushu University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan
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20
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Yavuz DD, Walker DR, Shverdin MY, Yin GY, Harris SE. Quasiperiodic Raman technique for ultrashort pulse generation. PHYSICAL REVIEW LETTERS 2003; 91:233602. [PMID: 14683184 DOI: 10.1103/physrevlett.91.233602] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/06/2003] [Indexed: 05/24/2023]
Abstract
We report the experimental demonstration of a new Raman technique that produces 200 sidebands, ranging in wavelength from 3 microm to 195 nm. By studying multiphoton ionization of nitric oxide (NO) molecules, we show mutual phase coherence among 15 visible sidebands covering 0.63 octaves of bandwidth.
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Affiliation(s)
- D D Yavuz
- Edward L. Ginzton Laboratory, Stanford University, Stanford, California 94305, USA
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21
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Kalosha VP, Herrmann J. Compression of single-cycle mid-infrared pulses by Raman-active molecular modulators. OPTICS LETTERS 2003; 28:950-952. [PMID: 12816256 DOI: 10.1364/ol.28.000950] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
We show theoretically how high-order stimulated Raman scattering in the impulsive pump-probe regime can be used for generation of single mid-infrared (MIR) single-cycle pulses. The propagation of MIR probe pulses in a hollow waveguide filled with a Raman-excited gaseous medium, with a probe delay in the maximum of the molecular oscillations, results in spectral broadening covering almost 2 octaves. The spectral phases of this broadening can be compensated for by use of an output glass window with anomalous dispersion in the MIR. The spectral and temporal characteristics of the output pulses and the mechanism of pulse compression are studied by use of numerical and analytical solutions, and compression of a 70-fs input pulse at 4 microm to a single-cycle 6.5-fs output pulse is shown.
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Affiliation(s)
- V P Kalosha
- Max Born Institute for Nonlinear Optics and Short-Pulse Spectroscopy, Max-Born-Strasse 2a, D-12489 Berlin, Germany.
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22
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Spanner M, Ivanov MY, Kalosha V, Hermann J, Wiersma DA, Pshenichnikov M. Tunable optimal compression of ultrabroadband pulses by cross-phase modulation. OPTICS LETTERS 2003; 28:749-751. [PMID: 12747727 DOI: 10.1364/ol.28.000749] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
We show how cross-phase modulation between two pulses, combined with optimal pulse shaping at the input of a dielectric medium, can be used to generate nearly single-cycle pulses that are tunable from the ultraviolet to the mid-infrared at the output of the medium, precompensating for dispersion to all orders.
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Affiliation(s)
- Michael Spanner
- Department of Physics, University of Waterloo, Waterloo, ON N2L 0R6, Canada
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Spanner M, Ivanov MY. Optimal generation of single-dispersion precompensated 1-fs pulses by molecular phase modulation. OPTICS LETTERS 2003; 28:576-578. [PMID: 12696620 DOI: 10.1364/ol.28.000576] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
We show how an optimal control approach can be combined with the pump-probe technique for pulse compression by molecular phase modulation in hollow-core fibers to generate single 1-fs pulses in the visible. Varying the intensity and duration of the Gaussian-shaped pump pulse at the input induces optimal rotational response of the molecules. The probe pulse, which scatters off of the resulting time variation of the refractive index, is shaped at the input for optimal compression at the output, including dispersion to all orders.
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Affiliation(s)
- Michael Spanner
- Steacie Institute for Molecular Sciences, National Research Council of Canada, 100 Sussex Drive, Ottawa, Ontario K1A OR6, Canada.
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Losev LL, Song J, Xia JF, Strickland D, Brukhanov VV. Multifrequency parametric infrared Raman generation in KGd(WO(4))(2) crystal with biharmonic ultrashort-pulse pumping. OPTICS LETTERS 2002; 27:2100-2102. [PMID: 18033454 DOI: 10.1364/ol.27.002100] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Mutlifrequency parametric Raman generation was carried out in a KGd(WO(4))(2) crystal by use of a dual-wavelength Ti:sapphire laser system. It was found that with femtosecond pump pulses the efficiency of Raman generation is low because of the onset of self-phase modulation. The mechanism for suppression of stimulated Raman scattering by self-phase modulation is discussed. Employing 2-ps-long chirped pulses generated four Stokes and one anti-Stokes component.
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25
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Mücke OD, Tritschler T, Wegener M, Morgner U, Kärtner FX. Determining the carrier-envelope offset frequency of 5-fs pulses with extreme nonlinear optics in ZnO. OPTICS LETTERS 2002; 27:2127-2129. [PMID: 18033463 DOI: 10.1364/ol.27.002127] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
We excite ZnO samples with two-cycle optical pulses directly from a mode-locked oscillator with average powers of several tens of milliwatts. The emitted light reveals peaks at the carrier-envelope offset frequency f(ø) and at 2f(ø) in the radio-frequency spectra. These peaks can still be detected in layers as thin as 350 nm-a step toward determining the carrier-envelope offset phase itself.
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27
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Kawano H, Ishikawa K, Suda A, Midorikawa K. Polarization of multiple rotational Raman sidebands from hydrogen gas by delayed four-wave Raman mixing in the femtosecond regime. OPTICS LETTERS 2002; 27:1917-1919. [PMID: 18033401 DOI: 10.1364/ol.27.001917] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
We demonstrate delayed four-wave Raman mixing in hydrogen gas and discuss the polarization of multiple rotational Raman radiation in the sub-100-fs regime. The mechanism of sideband generation through the interaction between a probe pulse and coherence of molecular motions induced by a pump pulse in hydrogen is revealed. One can artificially control the ellipticity of the polarization of the rotational Raman sidebands by changing the pump pulse polarization.
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28
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Mücke OD, Tritschler T, Wegener M, Morgner U, Kärtner FX. Role of the carrier-envelope offset phase of few-cycle pulses in nonperturbative resonant nonlinear optics. PHYSICAL REVIEW LETTERS 2002; 89:127401. [PMID: 12225122 DOI: 10.1103/physrevlett.89.127401] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2002] [Indexed: 05/23/2023]
Abstract
We study the influence of the carrier-envelope offset phase of few-cycle pulses on nonperturbative resonant extreme nonlinear optics in a semiconductor. If the Rabi frequency becomes comparable to the light frequency, the different Rabi sidebands interfere around twice the laser center frequency, giving rise to a signal which strongly depends on the carrier-envelope offset phase. This signature should be measurable in GaAs samples.
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Affiliation(s)
- O D Mücke
- Institut für Angewandte Physik, Universität Karlsruhe (TH), Wolfgang-Gaede-Strasse 1, 76131 Karlsruhe, Germany
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Scully MO, Kattawar GW, Lucht RP, Opatrny T, Pilloff H, Rebane A, Sokolov AV, Zubairy MS. FAST CARS: engineering a laser spectroscopic technique for rapid identification of bacterial spores. Proc Natl Acad Sci U S A 2002; 99:10994-1001. [PMID: 12177405 PMCID: PMC123198 DOI: 10.1073/pnas.172290899] [Citation(s) in RCA: 184] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/15/2002] [Indexed: 11/18/2022] Open
Abstract
Airborne contaminants, e.g., bacterial spores, are usually analyzed by time-consuming microscopic, chemical, and biological assays. Current research into real-time laser spectroscopic detectors of such contaminants is based on e.g., resonance fluorescence. The present approach derives from recent experiments in which atoms and molecules are prepared by one (or more) coherent laser(s) and probed by another set of lasers. However, generating and using maximally coherent oscillation in macromolecules having an enormous number of degrees of freedom is challenging. In particular, the short dephasing times and rapid internal conversion rates are major obstacles. However, adiabatic fast passage techniques and the ability to generate combs of phase-coherent femtosecond pulses provide tools for the generation and utilization of maximal quantum coherence in large molecules and biopolymers. We call this technique FAST CARS (femtosecond adaptive spectroscopic techniques for coherent anti-Stokes Raman spectroscopy), and the present article proposes and analyses ways in which it could be used to rapidly identify preselected molecules in real time.
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Affiliation(s)
- M O Scully
- Institute for Quantum Studies, Departments of Physics, Electrical Engineering, and Mechanical Engineering, Texas A&M University, College Station, TX 77843, USA.
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Zhavoronkov N, Korn G. Generation of single intense short optical pulses by ultrafast molecular phase modulation. PHYSICAL REVIEW LETTERS 2002; 88:203901. [PMID: 12005564 DOI: 10.1103/physrevlett.88.203901] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/31/2001] [Indexed: 05/23/2023]
Abstract
Pulses with durations below 4 fs have been generated using the method of ultrafast molecular phase modulation. A laser pulse shorter than the molecular vibrational or rotational period obtains spectral broadening during propagation along a hollow waveguide filled with previously impulsively excited Raman active gases. The induced time dependent phase, frequency, and frequency chirp are controllable by changing the delay between excitation and probe pulse within the molecular vibrational period.
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Affiliation(s)
- N Zhavoronkov
- Max-Born-Institut, Max-Born Strasse 2A, Berlin, D-12489, Germany.
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Yavuz DD, Walker DR, Yin GY, Harris SE. Rotational Raman generation with near-unity conversion efficiency. OPTICS LETTERS 2002; 27:769-771. [PMID: 18007927 DOI: 10.1364/ol.27.000769] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
We demonstrate collinear generation of equidistant rotational sidebands in low-pressure molecular hydrogen with near-unity conversion efficiency. The spectrum consists of 37 coherent sidebands covering over 20, 000 cm(-1) of spectral bandwidth and ranging from 1.37mum to 352 nm in wavelength.
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