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Xia L, van der Slot PJM, Timmerkamp M, Bastiaens HMJ, Fallnich C, Boller KJ. On-chip phase-shift induced control of supercontinuum generation in a dual-core Si 3N 4 waveguide. OPTICS EXPRESS 2023; 31:37472-37482. [PMID: 38017875 DOI: 10.1364/oe.501938] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2023] [Accepted: 10/12/2023] [Indexed: 11/30/2023]
Abstract
We investigate on-chip spectral control of supercontinuum generation, taking advantage of the additional spatial degree of freedom in strongly-coupled dual-core waveguides. Using numerical integration of the multi-mode generalized nonlinear Schrödinger equation, we show that, with proper waveguide cross-section design, selective excitation of supermodes can vary the dispersion to its extremes, i.e., all-normal or anomalous dispersion can be selected via phase shifting in a Mach-Zehnder input circuit. The resulting control allows to provide vastly different supercontinuum spectra with the same waveguide circuit.
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Lefort C, O'Connor RP, Blanquet V, Magnol L, Kano H, Tombelaine V, Lévêque P, Couderc V, Leproux P. Multicolor multiphoton microscopy based on a nanosecond supercontinuum laser source. JOURNAL OF BIOPHOTONICS 2016; 9:709-14. [PMID: 26872004 DOI: 10.1002/jbio.201500283] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2015] [Revised: 12/19/2015] [Accepted: 01/06/2016] [Indexed: 05/24/2023]
Abstract
Multicolor multiphoton microscopy is experimentally demonstrated for the first time on a spectral bandwidth of excitation of 300 nm (full width half maximum) thanks to the implementation a nanosecond supercontinuum (SC) source compact and simple with a low repetition rate. The interest of such a wide spectral bandwidth, never demonstrated until now, is highlighted in vivo: images of glioma tumor cells stably expressing eGFP grafted on the brain of a mouse and its blood vessels network labelled with Texas Red(®) are obtained. These two fluorophores have a spectral bandwidth covering the whole 300 nm available. In parallel, a similar image quality is obtained on a sample of mouse muscle in vitro when excited with this nanosecond SC source or with a classical high rate, femtosecond and quasi monochromatic laser. This opens the way for (i) a simple and very complete biological characterization never performed to date with multiphoton processes, (ii) multiple means of contrast in nonlinear imaging allowed by the use of numerous fluorophores and (iii) other multiphoton processes like three-photon ones.
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Affiliation(s)
- Claire Lefort
- Université de Limoges, CNRS UMR 7252, Labex "Sigma-Lim", INRA UMR 1061, F-87000, Limoges, France.
| | - Rodney P O'Connor
- Université de Limoges, CNRS UMR 7252, Labex "Sigma-Lim", INRA UMR 1061, F-87000, Limoges, France
| | - Véronique Blanquet
- Université de Limoges, CNRS UMR 7252, Labex "Sigma-Lim", INRA UMR 1061, F-87000, Limoges, France
| | - Laetitia Magnol
- Université de Limoges, CNRS UMR 7252, Labex "Sigma-Lim", INRA UMR 1061, F-87000, Limoges, France
| | - Hideaki Kano
- Institute of Applied Physics, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8573, Japan
| | - Vincent Tombelaine
- LEUKOS Innovative Optical Systems, 37 rue Henri Giffard, Z.I. Nord, 87280, Limoges, France
| | - Philippe Lévêque
- Université de Limoges, CNRS UMR 7252, Labex "Sigma-Lim", INRA UMR 1061, F-87000, Limoges, France
| | - Vincent Couderc
- Université de Limoges, CNRS UMR 7252, Labex "Sigma-Lim", INRA UMR 1061, F-87000, Limoges, France
| | - Philippe Leproux
- Université de Limoges, CNRS UMR 7252, Labex "Sigma-Lim", INRA UMR 1061, F-87000, Limoges, France
- LEUKOS Innovative Optical Systems, 37 rue Henri Giffard, Z.I. Nord, 87280, Limoges, France
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