Single source coherent anti-Stokes Raman microspectroscopy using spectral focusing

摘要

We demonstrate coherent anti-Stokes Raman scattering (CARS) microspectroscopy using a single Ti:sapphire laser oscillator and simple passive optical elements. Spectral selection by dichroic mirrors and linear chirping by glass elements creates a vibrational excitation tuneable over a large spectral range (～800-2200 cm~(-1)) with adjustable spectral resolution (～10-100 cm~(-1)). We furthermore demonstrate the applicability of differential CARS, enhancing the chemical selectivity, with the proposed single-laser configuration.