Optical frequency comb active filtering and amplification for second cooling laser of strontium optical clock

doi:10.7498/aps.67.20172733

NTSC-IR

	Optical frequency comb active filtering and amplification for second cooling laser of strontium optical clock
	Xu Qin-Fang 1; Yin Mo-Juan 1; Kong De-Huan 1; Wang Ye-Bing 1,2; Lu Ben-Quan 1,2; Guo Yang 1,2; Chang Hong1
	2018-04-20
发表期刊	ACTA PHYSICA SINICA
ISSN	1000-3290
卷号	67 期号:8 页码:7
摘要	In this paper, we propose an optical frequency comb active filtering and amplification method combined with injection-locking technique to select and amplify a single mode from a femtosecond mode-locked laser. The key concept is to optically inject an optical frequency comb into a single mode grating external cavity semiconductor laser. The optical frequency comb based on a femtosecond mode-locked laser with a narrow mode spacing of 250 MHz is used as a master laser. The center wavelength of the optical frequency comb is 689 nm with a 10 nm spectral width. A single mode grating external cavity semiconductor laser with a grating of 1800 lines/mm is used as a slave laser, and the external-cavity length from the diode surface to the grating is approximately 50 mm. The master laser is injected into the slave laser, and in order to select a single comb mode, we adjust the power of the master laser to control the locking range of the slave laser whose linewidth is smaller than the optical frequency comb repetition rate (250 MHz). While the operating current of the slave laser is set to be 55 mA and a seeding power is adopted to be 240 mu W, a single longitudinal mode is selected and amplified from 2.5 x 10(4) longitudinal modes of the femtosecond optical comb despite the low power of the single mode. By tuning the optical frequency comb repetition frequency, the single longitudinal mode follows the teeth of the femtosecond optical comb, indicating the success in the optical frequency comb active filtering and amplification. The locking range is measured to be about 20 MHz. Meanwhile, the repetition frequency of the optical frequency comb is locked to a narrow linewidth 698 nm laser system (Hz level), thus the slave laser inherits the spectral characteristics of the 698 nm laser system. The linewidth is measured to be 280 Hz which is limited by the test beating laser. Then a continuous-wave narrow linewidth 689 nm laser source with a power of 12 mW and a side-mode suppression ratio of 100 is achieved. This narrow linewidth laser is used as a second-stage cooling laser source in the Sr-88 optical clock, the cold atoms with a temperature of 3 mu K and a number of 5 x 10(6) are obtained. This method can also be used to obtain other laser sources for atomic optical clock, and thus enabling the integrating and miniaturizing of a clock system.
关键词	optical frequency comb injection locking narrow linewidth laser strontium optical clock
资助者	National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program of Chinese Academy of Sciences ; Strategic Priority Research Program of Chinese Academy of Sciences ; Key Research Project of Frontier Science of Chinese Academy of Sciences ; Key Research Project of Frontier Science of Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program of Chinese Academy of Sciences ; Strategic Priority Research Program of Chinese Academy of Sciences ; Key Research Project of Frontier Science of Chinese Academy of Sciences ; Key Research Project of Frontier Science of Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program of Chinese Academy of Sciences ; Strategic Priority Research Program of Chinese Academy of Sciences ; Key Research Project of Frontier Science of Chinese Academy of Sciences ; Key Research Project of Frontier Science of Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program of Chinese Academy of Sciences ; Strategic Priority Research Program of Chinese Academy of Sciences ; Key Research Project of Frontier Science of Chinese Academy of Sciences ; Key Research Project of Frontier Science of Chinese Academy of Sciences
DOI	10.7498/aps.67.20172733
关键词[WOS]	LATTICE CLOCK ; INSTABILITY
语种	英语
资助项目	National Natural Science Foundation of China[11474282] ; National Natural Science Foundation of China[61775220] ; Strategic Priority Research Program of Chinese Academy of Sciences[XDB21030700] ; Key Research Project of Frontier Science of Chinese Academy of Sciences[QYZDB-SSW-JSC004]
资助者	National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program of Chinese Academy of Sciences ; Strategic Priority Research Program of Chinese Academy of Sciences ; Key Research Project of Frontier Science of Chinese Academy of Sciences ; Key Research Project of Frontier Science of Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program of Chinese Academy of Sciences ; Strategic Priority Research Program of Chinese Academy of Sciences ; Key Research Project of Frontier Science of Chinese Academy of Sciences ; Key Research Project of Frontier Science of Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program of Chinese Academy of Sciences ; Strategic Priority Research Program of Chinese Academy of Sciences ; Key Research Project of Frontier Science of Chinese Academy of Sciences ; Key Research Project of Frontier Science of Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program of Chinese Academy of Sciences ; Strategic Priority Research Program of Chinese Academy of Sciences ; Key Research Project of Frontier Science of Chinese Academy of Sciences ; Key Research Project of Frontier Science of Chinese Academy of Sciences
WOS研究方向	Physics
WOS类目	Physics, Multidisciplinary
WOS记录号	WOS:000443194600004
出版者	CHINESE PHYSICAL SOC
引用统计
文献类型	期刊论文
条目标识符	http://210.72.145.45/handle/361003/11648
专题	中国科学院国家授时中心
通讯作者	Chang Hong
作者单位	1.Chinese Acad Sci, Key Lab Time & Frequency Primary Stand, Natl Time Serv Ctr, Xian 710600, Shaanxi, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Xu Qin-Fang,Yin Mo-Juan,Kong De-Huan,et al. Optical frequency comb active filtering and amplification for second cooling laser of strontium optical clock[J]. ACTA PHYSICA SINICA,2018,67(8):7.
APA	Xu Qin-Fang.,Yin Mo-Juan.,Kong De-Huan.,Wang Ye-Bing.,Lu Ben-Quan.,...&Chang Hong.(2018).Optical frequency comb active filtering and amplification for second cooling laser of strontium optical clock.ACTA PHYSICA SINICA,67(8),7.
MLA	Xu Qin-Fang,et al."Optical frequency comb active filtering and amplification for second cooling laser of strontium optical clock".ACTA PHYSICA SINICA 67.8(2018):7.