Ultrabroadband Multiplex Coherent anti-Stokes Raman Scattering (CARS) Microspectroscopy Using a CCD Camera with an InGaAs Image Intensifier

We developed a new microspectroscopic system based on the ultrabroadband multiplex coherent anti-Stokes Raman scattering (CARS) process using a CCD camera with an InGaAs image intensifier. Owing to the gated amplification of the CARS signal by the InGaAs Image intensifier , the CARS signal was detected with even less than 10 laser shots. As a proof-of-principle study, we applied our system to visualizing the heterogeneous structure of a blended polymer consisting of cellulose acetate and cellulose tris(phenylcarbamate). The clear vibrational contrast was observed under weak excitation condition.