Dual-Comb Coherent Raman Spectroscopy with Lasers of 1-GHz Pulse Repetition Frequency

TL;DR

This paper demonstrates a dual-comb coherent Raman spectroscopy technique using 1-GHz repetition lasers, achieving rapid, high-resolution spectra of liquids with significantly reduced acquisition times compared to lower repetition rate systems.

Contribution

The work extends multiplex coherent Raman spectroscopy to 1-GHz lasers, enabling faster measurements and improved acquisition efficiency over previous 100-MHz systems.

Findings

Spectra span 1100 cm$^{-1}$ of Raman shifts.

Measurement time as short as 5 microseconds.

Refresh rate of 2 kHz with ten-fold improvement in waiting period.

Abstract

We extend the technique of multiplex coherent Raman spectroscopy with two femtosecond mode-locked lasers to oscillators of a pulse repetition frequency of 1 GHz. We demonstrate spectra of liquids, which span 1100 cm$^{-1}$ of Raman shifts. At a resolution of 6 cm$^{-1}$, their measurement time may be as short as 5 microseconds for a refresh rate of 2 kHz. The waiting period between acquisitions is improved ten-fold compared to previous experiments with two lasers of 100-MHz repetition frequencies.