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Chin. Phys. B, 2015, Vol. 24(2): 024213    DOI: 10.1088/1674-1056/24/2/024213
ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS Prev   Next  

A 23.75-GHz frequency comb with two low-finesse filtering cavities in series for high resolution spectroscopy

Hou Lei (侯磊)a, Han Hai-Nian (韩海年)a, Wang Wei (王薇)b, Zhang Long (张龙)a, Pang Li-Hui (庞利辉)a, Li De-Hua (李德华)a, Wei Zhi-Yi (魏志义)a
a Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
b Department of Physics, Capital Normal University, Beijing 100048, China
Abstract  A laser frequency comb with several tens GHz level is demonstrated, based on a Yb-doped femtosecond fiber laser and two low-finesse Fabry-Pérot cavities (FPCs) in series. The original 250-MHz mode-line-spacing of the source comb is filtered to 4.75 GHz and 23.75 GHz, respectively. According to the multi-beam interferences theory of FPC, the side-mode suppression rate of FPC schemes is in good agreement with our own theoretical results from 27 dB of a single FPC to 43 dB of paired FPCs. To maintain long-term stable operation and determine the absolute frequency mode number in the 23.75-GHz comb, the Pound-Drever-Hall (PDH) locking technology is utilized. Such stable tens GHz frequency combs have important applications in calibrating astronomical spectrographs with high resolution.
Keywords:  laser frequency comb      Fabry-Pérot cavity      high repetition rate      high resolution spectroscopy  
Received:  23 July 2014      Revised:  12 August 2014      Accepted manuscript online: 
PACS:  42.55.Wd (Fiber lasers)  
  42.60.Fc (Modulation, tuning, and mode locking)  
  42.62.Eh (Metrological applications; optical frequency synthesizers for precision spectroscopy)  
Fund: Project supported by the National Basic Research Program of China (Grant No. 2012CB821304) and the National Natural Science Foundation of China (Grant Nos. 11078022 and 61378040).
Corresponding Authors:  Han Hai-Nian, Wei Zhi-Yi     E-mail:  hnhan@iphy.ac.cn;zywei@iphy.ac.cn

Cite this article: 

Hou Lei (侯磊), Han Hai-Nian (韩海年), Wang Wei (王薇), Zhang Long (张龙), Pang Li-Hui (庞利辉), Li De-Hua (李德华), Wei Zhi-Yi (魏志义) A 23.75-GHz frequency comb with two low-finesse filtering cavities in series for high resolution spectroscopy 2015 Chin. Phys. B 24 024213

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