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

doi:10.1088/1674-1056/24/2/024213

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

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

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