Coherent Raman spectroscopy through one-dimensional random scattering medium

Abstract

We investigate the possibility of implementing coherent anti-Stokes Raman spectroscopy (CARS) with a single laser beam passed through a one-dimensional scattering object. The effect of the random scattering is emulated by shaping the laser pulses with a spectral mask corresponding to the transmission spectrum of a random layered medium. Raman resonances are retrieved through correlation analysis of the CARS spectrum. We study the effect of the scattering parameters on the resolution of the method, and show that improvement of the spectroscopic sensitivity can be achieved by compensating the phase distortions introduced by the scatterer.

Interference spectroscopy with coherent anti‐Stokes Raman scattering of noisy broadband pulses

“…We refer the reader to Ref. [20] for a detailed discussion of the transmission lines of a random layered medium, and of their dependance on the system parameters.…”

“…When, on the other hand, the spectra are different, the interference is suppressed and the the fringe visibility decreases. Random spectral noise has been recently exploited in coherent nonlinear spectroscopy [20,24,25], and this work extends its applications to interferometric CARS techniques.…”

Femtosecond lasing from a fluorescent protein in a one dimensional random cavity

“…2(a, b). The broad fluorescence line shape is modulated by a quasi-periodic transmission spectrum of the random stack [21] as shown in Fig. 2(a).…”