Quasi-real-time dual-comb spectroscopy with 750-MHz Yb:fiber combs
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arXiv
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866916110093254656 |
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| author | Tian, Haochen Li, Runmin Sterczewski, Lukasz A. Kato, Takashi Asahara, Akifumi Minoshima, Kaoru |
| author_facet | Tian, Haochen Li, Runmin Sterczewski, Lukasz A. Kato, Takashi Asahara, Akifumi Minoshima, Kaoru |
| contents | We present quasi-real-time dual-comb spectroscopy (DCS) using two Yb:fiber combs with ~750 MHz repetition rates. A computational coherent averaging technique is employed to correct timing and phase fluctuations of the measured dual-comb interferogram (IGM). Quasi-real-time phase correction of 1-ms long acquisitions occurs every 1.5 seconds and is assisted by coarse radio frequency (RF) phase-locking of an isolated RF comb mode. After resampling and global offset phase correction, the RF comb linewidth is reduced from 200 kHz to ~1 kHz, while the line-to-floor ratio increases 13 dB in power in 1 ms. Using simultaneous offset frequency correction in opposite phases, we correct the aliased RF spectrum spanning three Nyquist zones, which yields an optical coverage of ~180 GHz around 1.035 $μ$m probed on a sub-microsecond timescale. The absorption profile of gaseous acetylene is observed to validate the presented technique. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_16523 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Quasi-real-time dual-comb spectroscopy with 750-MHz Yb:fiber combs Tian, Haochen Li, Runmin Sterczewski, Lukasz A. Kato, Takashi Asahara, Akifumi Minoshima, Kaoru Optics We present quasi-real-time dual-comb spectroscopy (DCS) using two Yb:fiber combs with ~750 MHz repetition rates. A computational coherent averaging technique is employed to correct timing and phase fluctuations of the measured dual-comb interferogram (IGM). Quasi-real-time phase correction of 1-ms long acquisitions occurs every 1.5 seconds and is assisted by coarse radio frequency (RF) phase-locking of an isolated RF comb mode. After resampling and global offset phase correction, the RF comb linewidth is reduced from 200 kHz to ~1 kHz, while the line-to-floor ratio increases 13 dB in power in 1 ms. Using simultaneous offset frequency correction in opposite phases, we correct the aliased RF spectrum spanning three Nyquist zones, which yields an optical coverage of ~180 GHz around 1.035 $μ$m probed on a sub-microsecond timescale. The absorption profile of gaseous acetylene is observed to validate the presented technique. |
| title | Quasi-real-time dual-comb spectroscopy with 750-MHz Yb:fiber combs |
| topic | Optics |
| url | https://arxiv.org/abs/2401.16523 |