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Spectral distortion of dual-comb spectrometry due to repetition rate fluctuation |
Hong-Lei Yang(杨宏雷), Hao-Yun Wei(尉昊赟), Yan Li(李岩) |
State Key Laboratory of Precision Measurement Technology & Instruments, Department of Precision Instrument, Tsinghua University, Beijing 100084, China |
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Abstract Dual-comb spectrometry suffers the fluctuations of parameters in combs. We demonstrate that the repetition rate is more important than any other parameter, since the fluctuation of the repetition rate leads to a change of difference in the repetition rate between both combs, consequently causing the conversion factor variation and spectral frequency misalignment. The measured frequency noise power spectral density of the repetition rate exhibits an integrated residual frequency modulation of 1.4 Hz from 1 Hz to 100 kHz in our system. This value corresponds to the absorption peak fluctuation within a root mean square value of 0.19 cm-1 that is verified by both simulation and experimental result. Further, we can also simulate spectrum degradation as the fluctuation varies. After modifying misaligned spectra and averaging, the measured result agrees well with the simulated spectrum based on the GEISA database.
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Received: 12 October 2015
Revised: 15 November 2015
Accepted manuscript online:
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PACS:
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42.62.Eh
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(Metrological applications; optical frequency synthesizers for precision spectroscopy)
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33.20.Ea
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(Infrared spectra)
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33.20.-t
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(Molecular spectra)
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Fund: Project supported by the State Key Laboratory of Precision Measurement Technology & Instruments of Tsinghua University and the Young Scientists Fund of the National Natural Science Foundation of China (Grant No. 61205147). |
Corresponding Authors:
Yan Li
E-mail: liyan@mail.tsinghua.edu.cn
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Cite this article:
Hong-Lei Yang(杨宏雷), Hao-Yun Wei(尉昊赟), Yan Li(李岩) Spectral distortion of dual-comb spectrometry due to repetition rate fluctuation 2016 Chin. Phys. B 25 044207
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