Suppression of frequency-mixing effect for pm-level heterodyne interferometers based on "zero coupling" optical path length control

被引：3

作者：

Cao, Bin

Jia, Fu-Ling

Yang, Ming-Lin

Liao, Fang-Jie

Wu, Kai-Hang

Huang, Xiang-Qing

Ming, Min

Zhang, Jing-Yi

Wen, Shi-Zhe

Duan, Hui-Zong ^{[1
]}

Yeh, Hsien-Chi

机构：

[1] Sun Yat Sen Univ, TianQin Res Ctr Gravitat Phys, Frontiers Sci Ctr TianQin, CNSA Res Ctr Gravitat Waves,MOE Key Lab TianQin Mi, Zhuhai Campus, Zhuhai 519082, Peoples R China

来源：

OPTICS LETTERS | 2024年 / 49卷 / 12期

基金：

中国国家自然科学基金;

关键词：

Displacement measurement - Heterodyning - Interferometers - Laser interferometry - Stray light;

D O I：

10.1364/OL.523455

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Optical path length (OPL) noise resulting from stray light significantly constrains interferometry displacement measurements in the low -frequency band. This paper presents an analytical model considering the presence of stray light in heterodyne laser interferometers. Due to the cyclic nonlinear coupling effect, there will be some special OPLs of stray light, minimizing the frequency -mixing impact to zero. Consequently, we propose a noise suppression scheme that locks the OPL of stray light at the zero coupling point. Therefore, we significantly enhanced the interference displacement measurement noise within the low -frequency band. Experimental results show that the interferometer achieves a displacement noise level lower than 6 pm/Hz 1 / 2 covering 1 mHz. (c) 2024 Optica Publishing Group

引用

页码：3300 / 3303

页数：4

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