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Optimisation De L'Émission Du Continuum Femtoseconde

Authors: Ramstein, Stéphane; Mottin, Stéphane;

Optimisation De L'Émission Du Continuum Femtoseconde

Abstract

{"references": ["N. Plesnila et al. (2002), J. Neurosci. Methods, 114, 107-117", "J. P. Culver et al. (2003), J. Cereb. Blood Flow Metab., 23, 911-924", "B. Beauvoit et al. (1995), Anal. Biochem., 226, 167-174", "P. Taroni et al. (2004), J. Biomed. Opt., 9, 464-473", "S. Andersson-Engels et al. (1993), Opt. Let., 18, 1697-1699", "S. Ramstein et al. (2003), J. Phys. IV, 108, 127-130; DOI 10.1051/jp4:20030612", "P. Laporte et al. (2004), Proc. SPIE, 5249, 490-500; DOI 10.1117/12.514036", "R. R. Alfano et al. (1970), Phys. Rev. Let., 24, 584-587", "R. R. Alfano et al. (1970), Phys. Rev. Let., 24, 592-594", "R. R. Alfano (1989), The supercontinuum laser source, Springer-Verlag", "A. Brodeur et al. (1998), Phys. Rev. Let., 80, 4406-4409", "A. Brodeur et al. (1999), J. Opt. Soc. Am. B, 16, 637-650", "J. M. Watson (1994), Universit\u00e9 de Paris-Sud, Orsay", "S. S. Arvinder et al. (2000), Opt. Commun., 181, 101-107", "D. N. Nikogoyan (1997), Properties of optical and laser-related materials a Handbook, Wiley & sons", "S. L. Chin et al. (1996), Appl. Opt., 35, 907-911"]}

Un dispositif de spectroscopie avec résolution du temps de vol des photons en milieu diffus a été développé. Celui-ci repose sur l utilisation d un continuum de lumière blanche généré par focalisation d un laser amplifié (830 nm, 1 kHz, 0.5 W, 170 fs) dans de l eau déminéralisée. Afin d optimiser spectralement et en puissance la source blanche sur la fenêtre spectrale 600-800 nm, une étude de la mise en forme spatio-temporelle avant autofocalisation de l impulsion laser par le milieu a été menée. Cette mise en forme est effectuée de manière spatiale en changeant la focale de la lentille de focalisation et de manière temporelle en changeant le taux de compression de l impulsion. L étude montre que le cône de lumière émise possède plus de puissance dans la fenêtre spectrale d intérêt pour des focales longues. Sur la fenêtre 600-800 nm, le rendement énergétique intégré varie de 5%, avec une focale f = 6 cm, à 15%, avec une focale f = 30 cm. La mise en forme temporelle montre des effets similaires avec les mêmes ordres de grandeur.

License CC-BY-NC-ND. --------- French law about open access and open science: https://www.legifrance.gouv.fr/affichTexte.do?cidTexte=JORFTEXT000033202746&categorieLien=id ----------------------- LOI n° 2016-1321 du 7 octobre 2016 pour une République numérique - Article 30.

Keywords

[PHYS]Physics [physics], Time-resolved spectroscopy, Scattering media, Ultrafast technology, http://id.loc.gov/authorities/subjects/sh89005705.html, [SDV.NEU.NB]Life Sciences [q-bio]/Neurons and Cognition [q-bio.NC]/Neurobiology, http://id.loc.gov/authorities/subjects/sh91006099.html, Optical design, white light generation, femtosecond laser, http://id.loc.gov/authorities/subjects/sh85095181.html, http://id.loc.gov/authorities/subjects/sh85091159.html, [SDV.IB]Life Sciences [q-bio]/Bioengineering, [SDV.NEU]Life Sciences [q-bio]/Neurons and Cognition [q-bio.NC], Chemometrics, Spectroscopy

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