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Cavity-Enhanced Vernier Spectroscopy with a Chip-Scale Mid-Infrared Frequency Comb

Sterczewski, Lukasz A. and Chen, Tzu-Ling and Ober, Douglas C. and Markus, Charles R. and Canedy, Chadwick L. and Vurgaftman, Igor and Frez, Clifford and Meyer, Jerry R. and Okumura, Mitchio and Bagheri, Mahmood (2022) Cavity-Enhanced Vernier Spectroscopy with a Chip-Scale Mid-Infrared Frequency Comb. ACS Photonics, 9 (3). pp. 994-1001. ISSN 2330-4022. doi:10.1021/acsphotonics.1c01849.

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Chip-scale optical frequency combs can provide broadband spectroscopy for diagnosing complex organic molecules. They are also promising as miniaturized laser spectrometers in applications ranging from atmospheric chemistry to geological science and the search for extraterrestrial life. While optical cavities are commonly used to boost sensitivity, it is challenging to realize a compact cavity-enhanced comb-based spectrometer. Here, we apply the Vernier technique to free-running operation of an interband cascade laser frequency comb in a simple linear geometry that performs cavity-enhanced chemical sensing. A centimeter-scale high-finesse cavity simultaneously provides selective mode filtering and enhancement of the path length to 30 m. As a proof-of-concept, we sense transient open-path releases of ppm-level difluoroethane with 2 ms temporal resolution over a 1 THz optical bandwidth centered at 3.64 μm. The sub-MHz comb teeth width governs the optical resolution, while the ∼9.7 GHz comb repetition rate determines the optical sampling grid. The minimum detectable absorption reaches 4.3 × 10⁻² at 300 ms.

Item Type:Article
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URLURL TypeDescription Paper
Chen, Tzu-Ling0000-0002-2243-5780
Markus, Charles R.0000-0003-2656-0017
Okumura, Mitchio0000-0001-6874-1137
Additional Information:© 2022 The Authors. Published by American Chemical Society. Received: December 2, 2021. This work was supported by and was in part performed at the Jet Propulsion Laboratory (JPL), California Institute of Technology, under a contract with NASA. The research by L.A.S. was supported by an appointment to the NASA Postdoctoral Program at JPL, administered by Universities Space Research Association under a contract with NASA. The NRL authors acknowledge support from the Office of Naval Research (ONR). C.R.M. is grateful for support from the Arnold and Mabel Beckman Foundation through the A. O. Beckman Postdoctoral Fellowship. Funding: National Aeronautics and Space Agency’s (NASA) PICASSO Program (106822/811073., PDRDF Program; Universities Space Research Association (USRA), NASA Postdoctoral Program (NPP); Office of Naval Research through the U.S. Naval Research Laboratory. The authors declare no competing financial interest.
Funding AgencyGrant Number
NASA Postdoctoral ProgramUNSPECIFIED
Office of Naval Research (ONR)UNSPECIFIED
Arnold and Mabel Beckman FoundationUNSPECIFIED
Subject Keywords:interband cascade laser, frequency comb, mid-infrared, Vernier spectroscopy, cavity-enhanced
Issue or Number:3
Record Number:CaltechAUTHORS:20220119-233949917
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Official Citation:Cavity-Enhanced Vernier Spectroscopy with a Chip-Scale Mid-Infrared Frequency Comb. Lukasz A. Sterczewski, Tzu-Ling Chen, Douglas C. Ober, Charles R. Markus, Chadwick L. Canedy, Igor Vurgaftman, Clifford Frez, Jerry R. Meyer, Mitchio Okumura, and Mahmood Bagheri. ACS Photonics 2022 9 (3), 994-1001; DOI: 10.1021/acsphotonics.1c01849
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:113006
Deposited By: George Porter
Deposited On:20 Jan 2022 20:17
Last Modified:23 Mar 2022 17:14

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