Broadband cavity-enhanced molecular absorption and dispersion spectroscopy with a frequency comb-based VIPA spectrometer

Charczun, Dominik

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https://hdl.handle.net/2142/100524 Copy

Description

Title

Broadband cavity-enhanced molecular absorption and dispersion spectroscopy with a frequency comb-based VIPA spectrometer

Author(s)

Charczun, Dominik

Contributor(s)

• Maslowski, Piotr
• Lisak, Daniel
• Trawiński, Ryszard S.
• Cygan, Agata
• Kowzan, Grzegorz

Issue Date

2018-06-19

Keyword(s)

Mini-symposium: Frequency-Comb Spectroscopy

Abstract

Cavity mode-width spectroscopy (CMWS) [1] and cavity mode-dispersion spectroscopy (CMDS) [2] techniques provide a way to simultaneously determine absorption and dispersion of a sample in an optical cavity. It was shown recently that CMDS can also be efficiently combined with optical frequency combs (OFCs) [3] to perform dispersion measurements in a broad spectral range. In this work, we utilize a near-infrared frequency comb and a VIPA spectrometer to retrieve absorption and dispersion of an atmospheric pressure CO-N2 sample in a high-finesse cavity, by measuring shapes and positions of 7-kHz-wide cavity modes at Hz-level precision. A Pound-Drever-Hall lock of a CW laser to the cavity and a phase-lock of the OFC to the CW laser allow for arbitrary detuning between comb and cavity modes, while cavity length stabilization to a Rb frequency standard provides absolute frequency scale. The signal-to-noise ratios for CMWS and CMDS spectra were, respectively, 190 and 380. To the best of our knowledge, the 7-kHz-wide cavity resonances shown in this work are the narrowest spectral features measured directly with a frequency comb. The presented technique is capable of fast acquisition and ultrahigh resolution in a broad spectral range, which makes it particularly suitable for spectroscopy of cold molecules or monitoring of chemical kinetics. [1] A. Cygan et al, Opt. Express 21, 29744 (2013). [2] A. Cygan et al, Opt. Express 23, 14472 (2015). [3] L. Rutkowski et al, Opt. Express 25, 21711–21718 (2017).

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

eng

Permalink

http://hdl.handle.net/2142/100524

DOI

10.15278/isms.2018.TG10

Copyright and License Information

Copyright 2018 Dominik Charczun

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