Broadband multiplex CARS micro-spectroscopy in the picosecond regime

International audience

Source optique fibrée pour la microscopie CARS

Polarized multiplex coherent anti-Stokes Raman scattering using a picosecond laser and a fiber supercontinuum

International audience; We perform multiplex coherent anti-Stokes Raman scattering (CARS) micro-spectroscopy with a picosecond pulsed laser and a broadband supercontinuum (SC) generated in photonic crystal fiber. CARS signal stability is achieved using an active fiber coupler that avoids thermal and mechanical drifts. We obtain multiplex CARS spectra for test liquids in the 600–2000 cm−1 spectral range. In addition we investigate the polarization dependence of the CARS spectra when rotating the pump beam linear polarization state relative to the linearly polarized broad stokes SC. From these polarization measurements we deduce the Raman depolarization ratio, the resonant versus nonresonant …

Optimisation de la densité spectrale d'énergie obtenue par auto-décalage fréquentiel Raman dans une fibre microstructurée

National audience