Video-rate broadband longwave IR dual-comb spectroscopy with 240,000 comb-mode resolved data points
Abstract
We report molecular detection using dual frequency-comb spectroscopy with highly coherent broadband (6.6-11.4 {\m}m) long-wavelength infrared (LWIR) combs. The combs were produced via intra-pulse difference frequency generation (IDFG) in ZGP crystals using sub-three-cycle (20 fs) driving pulses from mode-locked Cr:ZnS lasers at the central wavelength of 2.4 {\m}m). Real-time and up to video rate (0.1-12 s per spectrum) acquisition of molecular spectra with some 240,000 comb-mode-resolved data points spaced by 80 MHz and referenced to a Rb clock with a signal-to-noise ratio (SNR) >300 has been demonstrated. The key to achieving such a high rate of massive spectral data acquisition is a low phase and intensity noise of the LWIR combs and excellent mutual coherence. The high SNR was also facilitated by the high (7.5%) IDFG conversion efficiency resulting in an average LWIR comb power of 300 mW per channel.
Keywords
Cite
@article{arxiv.2210.07421,
title = {Video-rate broadband longwave IR dual-comb spectroscopy with 240,000 comb-mode resolved data points},
author = {Sergey Vasilyev and Andrey Muraviev and Dmitrii Konnov and Mike Mirov and Viktor Smoslki and Igor Moskalev and Sergey Mirov and Konstantin Vodopyanov},
journal= {arXiv preprint arXiv:2210.07421},
year = {2022}
}
Comments
7 pages, 8 figures (main text)