Ultra-rapid coherent anti-Stokes Raman dual-comb spectroscopy and microscopy

Nonlinear coherent Raman scattering with ultra-short pulse lasers has opened up new opportunities for nonintrusive three-dimensional label-free chemical sensing. A single ultrashort pulse laser, combined to a pulse shaper or a Michelson interferometer, allows for multiplex measurements. However, measuring a broad spectral bandwidth spectrum at high resolution within a very short acquisition time still remains a challenge. Recently dual-comb spectroscopy, which features such characteristics for linear absorption, been extended to nonlinear spectroscopy in a proof-of-principle experiment based on stimulated Raman scattering.