Free-running dual-comb spectroscopy based on calibration of passive devices

Chen Liu; Liang Xu; Lei Zhang; Chi Zhang; Xinliang Zhang

doi:10.1117/12.3007771

24 November 2023 Free-running dual-comb spectroscopy based on calibration of passive devices

Chen Liu, Liang Xu, Lei Zhang, Chi Zhang, Xinliang Zhang

Proceedings Volume 12935, Fourteenth International Conference on Information Optics and Photonics (CIOP 2023); 129353I (2023) https://doi.org/10.1117/12.3007771
Event: Fourteenth International Conference on Information Optics and Photonics (CIOP 2023), 2023, Xi’an, China

Abstract

In recent years, spectral measurement systems based on dual-comb interferometers have attracted more and more attention due to their characteristics of large bandwidth, high resolution, and high frame rate. However, the requirement to maintain strict coherence between light sources greatly hinders the development and application of dual-comb spectroscopy (DCS) systems. In this work, we use the phase-shifted fiber Bragg grating (PS-FBG) and the broadband Fabry-Perot cavity (F-P cavity) to calibrate the relative frequency jitter between two combs instead of introducing other complex feedback control loops. In this way, a DCS system operating at a free-running state was proposed and experimentally demonstrated. With the calibration of the PS-FBG, a 100-MHz resolution over the range of more than 100 nm was achieved without distortion. Benefitting from the excellent wavelength thermal stability, we subsequently corrected wavelength deviation through the optical frequency division process, and the equivalent locking accuracy improved by about 167 times compared with the traditional electrical reference scheme. Finally, the spectral absorption measurement of hydrogen cyanide gas molecules was carried out which was in good consistency with the HITRAN database to verify the potential in molecular spectroscopy. Our scheme is also compatible with other platforms and band ranges and will provide new solutions for free-running DCS systems.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Chen Liu, Liang Xu, Lei Zhang, Chi Zhang, and Xinliang Zhang "Free-running dual-comb spectroscopy based on calibration of passive devices", Proc. SPIE 12935, Fourteenth International Conference on Information Optics and Photonics (CIOP 2023), 129353I (24 November 2023); https://doi.org/10.1117/12.3007771

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KEYWORDS

Calibration

Spectroscopes

Teeth

Fiber Bragg gratings

Temperature metrology

Molecular spectroscopy

Oscillators

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