Rapid Dual-comb Coherent Raman Spectroscopy In The High-wavenumber Region

Zhang, Yujia

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https://hdl.handle.net/2142/116537 Copy

Description

Title

Rapid Dual-comb Coherent Raman Spectroscopy In The High-wavenumber Region

Author(s)

Zhang, Yujia

Contributor(s)

• Wei, Haoyun
• LI, Yan
• Lu, Minjian

Issue Date

2022-06-22

Keyword(s)

Instrument/Technique Demonstration

Abstract

\begin{wrapfigure}{r}{0pt} \includegraphics[scale=0.5]{graphics.eps} \end{wrapfigure} Delay-spectral focusing dual-comb coherent anti-Stokes Raman spectroscopy is proposed and performed, realizing a 40000 spectra/s acquisition rate, which is the fastest Raman spectral detection in the high-wavenumber region up to the present. The spectral resolution (\~{}10 \wn) and the signal-to-noise ratio (\~{}260) keep stable along the detection process. This novel spectroscopic technique avoids the invalid scanning time wasted in waiting for the superposition in time of the dual-comb pulses by actively modulating the repetition frequency difference and thus the relative delay. An intracavity electro-optic modulator (EOM), with high modulation amplitude and response frequency, is applied for fast repetition frequency modulation. Delay-spectral focusing method also helps to obtain the high-wavenumber region spectrum, which is difficult to realize for previously-used Fourier transform CARS (FT-CARS) due to the intrinsic coherence of ultrabroadband pulses. This technique shows huge potentials in which both high speed and high-wavenumber region detection are required, such as fast microspectroscopic imaging and flow cytometry.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

eng

Handle URL

https://hdl.handle.net/2142/116537&&

DOI

https://doi.org/10.15278/isms.2022.WJ10

Copyright and License Information

Copyright 2022 held by the authors

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