Abstract
Characterization of single-frequency lasers (SFLs) requires a precise measurement of their phase noise. However, there exists a contradiction between the frequency range and laser phase noise measurement sensitivity in the delay self-heterodyne method. Achieving a broadband and highly sensitive phase noise measurement often requires overlapping the results obtained from different delay lengths. In this study, we present a precisely designed short-fiber recirculating delayed self-heterodyne (SF-RDSH) method that enables the broadband and highly sensitive laser phase noise measurement in a compact setup. By designing the length of the delay fiber based on a theoretical model, the RDSH technique with a shortest delay length of 200 m enables a highly sensitive laser phase noise measurement from 1 Hz to 1 MHz for the first time, to our knowledge. In the experiment, we demonstrate the broadband phase noise measurement of an SFL by analyzing the 1st and 10th beat notes.
© 2024 Optica Publishing Group
Full Article | PDF ArticleMore Like This
Hidemi Tsuchida
Opt. Lett. 36(5) 681-683 (2011)
Weichao Ma, Bing Xiong, Changzheng Sun, Xu Ke, Zhibiao Hao, Lai Wang, Jian Wang, Yanjun Han, Hongtao Li, and Yi Luo
Appl. Opt. 58(13) 3555-3563 (2019)
Simon Thorndahl Thomsen, Mónica Far Brusatori, Niklas Hedegaard Arent, Rakesh Ranjan Kumar, and Nicolas Volet
Opt. Lett. 48(24) 6372-6375 (2023)