University of Illinois Urbana-Champaign

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

Zhang, Yujia

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WJ10_1.pptx
6027.pdf

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

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
Genre of Resource
Conference Paper / Presentation
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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Abstracts & Presentations - 2022 International Symposium on Molecular Spectroscopy PRIMARY