A Polarization-Insensitive Recirculating Delayed Self-Heterodyne Method for Sub-Kilohertz Laser Linewidth Measurement

被引：9
作者：
Gao, Jing [1 ,2 ,3 ]
Jiao, Dongdong [1 ,3 ]
Deng, Xue [1 ,3 ]
Liu, Jie [1 ,3 ]
Zhang, Linbo [1 ,2 ,3 ]
Zang, Qi [1 ,2 ,3 ]
Zhang, Xiang [1 ,2 ,3 ]
Liu, Tao [1 ,3 ]
Zhang, Shougang [1 ,3 ]
机构：
[1] Chinese Acad Sci, Natl Time Serv Ctr, Xian 710600, Peoples R China
[2] Univ Chinese Acad Sci, Beijing 100039, Peoples R China
[3] Chinese Acad Sci, Key Lab Time & Frequency Stand, Xian 710600, Peoples R China
来源：
PHOTONICS | 2021年 / 8卷 / 05期
基金：
中国国家自然科学基金; 中国科学院西部之光基金;
关键词：
the linewidth measurement of narrow laser; recirculating delayed loop; polarization insensitivity; self-heterodyne of beat spectrum; INTERFEROMETER; RESOLUTION;
D O I：
10.3390/photonics8050137
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
A polarization-insensitive recirculating delayed self-heterodyne method (PI-RDSHM) is proposed and demonstrated for the precise measurement of sub-kilohertz laser linewidths. By a unique combination of Faraday rotator mirrors (FRMs) in an interferometer, the polarization-induced fading is effectively reduced without any active polarization control. This passive polarization-insensitive operation is theoretically analyzed and experimentally verified. Benefited from the recirculating mechanism, a series of stable beat spectra with different delay times can be measured simultaneously without changing the length of delay fiber. Based on Voigt profile fitting of high-order beat spectra, the average Lorentzian linewidth of the laser is obtained. The PI-RDSHM has advantages of polarization insensitivity, high resolution, and less statistical error, providing an effective tool for accurate measurement of sub-kilohertz laser linewidth.
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页数：8
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