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Adaptive cavity-enhanced dual-comb spectroscopy
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DOI：10.1364/PRJ.7.000883.png)
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Abstract
En 中文
Resolution and bandwidth are critical for cavity-enhanced dual-comb spectroscopy (CE-DCS). Here, we pioneer an adaptive approach in CE-DCS to improve the broadband as well as the resolution. Postcorrections to dual-comb interferograms adaptively compensate the relative phase jitters of the optical frequency combs and result in both a mode-resolved spectral resolution and a signal-to-noise ratio of 440:1 in 1 s. Meanwhile, an adaptive combcavity locking scheme exploits more than 90% of the comb modes, covering 340 cm(-1) (10 THz) at 6450 cm(-1). For a single dual-comb interferogram, more than 40,000 comb teeth spaced by 250 MHz are measured in less than 7.5 ms, contributing to a noise equivalent absorption per spectral element of 2 x 10(-10) cm(-1).Hz(-1/2). This adaptive cavity-enhanced dual-comb spectroscopy technique provides an attractive spectroscopic tool that may be utilized in trace-gas sensing, breath and cancer analysis, and engine combustion diagnosis. (C) 2019 Chinese Laser Press
Keywords:
OPTICAL FREQUENCY COMB
LASERS
Journal
IF:
7.2
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2.4K
Citations:
1.3W
