Spectral interferometric polarised coherent anti-Stokes Raman spectroscopy

TL;DR

This paper introduces a broadband interferometric CARS technique that eliminates non-resonant background, encodes mode symmetry, and is compatible with various laser parameters, enhancing Raman spectroscopy capabilities.

Contribution

The authors develop a novel interferometric implementation of CARS that removes non-resonant background and encodes symmetry information using simple polarization optics.

Findings

Achieved background-free broadband CARS spectra

Demonstrated direct comparison with polarized spontaneous Raman spectra

Compatible with diverse laser linewidths and pulse durations

Abstract

We have developed an interferometric implementation of coherent anti-Stokes Raman scattering (CARS) which enables broadband coherent Raman spectroscopy free from non-resonant background (NRB), with a signal strength proportional to concentration. Spectra encode mode symmetry information into the amplitude response which can be directly compared to polarised spontaneous Raman spectra. The method requires only passive polarisation optics and is suitable for a wide range of laser linewidths and pulse durations