Abstract
A method called the optimal demodulated Lorentzian spectrum is employed to precisely quantify the narrowness of a laser’s linewidth. This technique relies on the coherent envelope demodulation of a spectrum obtained through short delayed self-heterodyne interferometry. Specifically, we exploit the periodic features within the coherence envelope spectrum to ascertain the delay time of the optical fiber. Furthermore, the disparity in contrast within the coherence envelope spectrum serves as a basis for estimating the laser’s linewidth. By creating a plot of the coefficient of determination for the demodulated Lorentzian spectrum fitting in relation to the estimated linewidth values, we identify the existence of an optimal Lorentzian spectrum. The corresponding laser linewidth found closest to the true value is deemed optimal. This method holds particular significance for accurately measuring the linewidth of lasers characterized as narrow or ultranarrow.
© 2024 Optica Publishing Group
Full Article | PDF ArticleCorrections
Lijin Wu, Zhongua Ji, Weixin Ma, Dianqiang Su, Yanting Zhao, Liantuan Xiao, and Suotang Jia, "Narrow laser linewidth measurement with the optimal demodulated Lorentzian spectrum: erratum," Appl. Opt. 63, 2561-2561 (2024)https://opg.optica.org/ao/abstract.cfm?uri=ao-63-10-2561
More Like This
Zhongan Zhao, Zhenxu Bai, Duo Jin, Yaoyao Qi, Jie Ding, Bingzheng Yan, Yulei Wang, Zhiwei Lu, and Richard P. Mildren
Opt. Express 30(17) 30600-30610 (2022)
Morteza Ahmadi, Tarun Dutta, and Manas Mukherjee
Opt. Express 32(10) 17879-17892 (2024)
Shihong Huang, Minggui Wan, Jiayang Wu, Dunke Lu, Bingzhi Zhang, Yanhua Zheng, Cuihong Liu, and Xiaohui Fang
Appl. Opt. 61(7) 1791-1796 (2022)