Raman-induced Kerr-effect dual-comb spectroscopy

TL;DR

This paper demonstrates a novel nonlinear dual-comb spectroscopy technique using Raman-induced Kerr effects, enabling rapid, broad-bandwidth phase and amplitude Raman measurements with high sensitivity.

Contribution

It introduces the first implementation of nonlinear dual-frequency-comb spectroscopy based on Raman-induced Kerr effects, combining femtosecond lasers with heterodyne detection for enhanced spectral analysis.

Findings

Achieved spectral resolution of 200 GHz.

Measured Raman spectra in 293 microseconds.

Sensitivity of 10^-6 for liquid samples.

Abstract

We report on the first demonstration of nonlinear dual-frequency-comb spectroscopy. In multi-heterodyne femtosecond Raman-induced Kerr-effect spectroscopy, the Raman gain resulting from the coherent excitation of molecular vibrations by a spectrally-narrow pump is imprinted onto the femtosecond laser frequency comb probe spectrum. The birefringence signal induced by the nonlinear interaction of these beams and the sample is heterodyned against a frequency comb local oscillator with a repetition frequency slightly different from that of the comb probe. Such time-domain interference provides multiplex access to the phase and amplitude Raman spectra over a broad spectral bandwidth within a short measurement time. Experimental demonstration, at a spectral resolution of 200 GHz, a measurement time of 293 {\mu}s and a sensitivity of 10^-6, is given on liquid samples exhibiting a C-H stretch Raman shift.