Computational Doppler-limited dual-comb spectroscopy with a free-running all-fiber laser
arXiv:1905.04647 · doi:10.1063/1.5117847
Abstract
Dual-comb spectroscopy has emerged as an indispensable analytical technique in applications that require high resolution and broadband coverage within short acquisition times. Its experimental realization, however, remains hampered by intricate experimental setups with large power consumption. Here, we demonstrate an ultra-simple free-running dual-comb spectrometer realized in a single all-fiber cavity suitable for the most demanding Doppler-limited measurements. Our dual-comb laser utilizes just a few basic fiber components, allows to tailor the repetition rate difference, and requires only 350 mW of electrical power for sustained operation over a dozen of hours. As a demonstration, we measure low-pressure hydrogen cyanide within 1.7 THz bandwidth, and obtain better than 1% precision over a terahertz in 200 ms enabled by a drastically simplified all-computational phase correction algorithm. The combination of the unprecedented setup simplicity, comb tooth resolution and high spectroscopic precision paves the way for proliferation of frequency comb spectroscopy even outside the laboratory.
arXiv comment15 pages, 7 figures, presented on 05/10 at CLEO 2019
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- Dual-comb spectroscopy using free-running mechanical sharing dual-comb fiber lasers
- Quasi-real-time dual-comb spectroscopy with 750-MHz Yb:fiber combs
- Cavity-Enhanced Vernier Spectroscopy with a Chip-Scale Mid-Infrared Frequency Comb
- Streaming Self-Corrected Dual-Comb Spectrometer
- Dual-dispersion-regime dual-comb mode-locked laser