Improvement and analysis of a recirculating delayed self-heterodyne interferometer for laser linewidth measurement

Wang Dongdong; Jiang Yanfei; Gu HanLi Li

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Improvement and analysis of a recirculating delayed self-heterodyne interferometer for laser linewidth measurement

机译：Improvement and analysis of a recirculating delayed self-heterodyne interferometer for laser linewidth measurement

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摘要

This paper presents an improved scheme of a passive recirculating delayed self-heterodyne interferometer (RDSHI) for laser linewidth measurement. The proposed scheme includes two additional fiber couplers in a regular RDSHI to independently control the reference beam and the loop signal for best system performance. The analysis and experimental results have confirmed that an initial equal power split for the reference beam is best suited to enhance the maximal number of detectable beat notes. The output coupling coefficient of the fiber loop has also been experimentally studied for system optimization. The experimental results have confirmed that the proposed modification to a basic RDSHI can achieve more detectable beat notes (14 vs. 12) and finer linewidth resolution (~14 improvement) than a basic RDSHI in our test setup of 2-km-long delay line.

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来源
《Optical fiber technology》 |2022年第7期|102945.1-102945.6|共6页
作者
Wang Dongdong; Jiang Yanfei; Gu HanLi Li;
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作者单位

Nanjing Univ Sci & Technol;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种英语
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关键词
Recirculating delayed self-heterodyne interfer; ometer; Narrow laser linewidth; Beat frequency; Measuring resolution;

Improvement and analysis of a recirculating delayed self-heterodyne interferometer for laser linewidth measurement

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