Spectral distortion of dual-comb spectrometry due to repetition rate fluctuation  

作　　者：杨宏雷 尉昊赟 李岩 

机构地区：[1]State Key Laboratory of Precision Measurement Technology & Instruments, Department of Precision Instrument,Tsinghua University

出　　处：《Chinese Physics B》2016年第4期161-165,共5页中国物理B（英文版）

基　　金：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)

摘　　要：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.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.

关 键 词：optical frequency comb Infrared spectra molecular spectra 

分 类 号：O433[机械工程—光学工程]