激光线宽
光学
连贯性(哲学赌博策略)
激光器
物理
包络线(雷达)
干涉测量
解调
计算机科学
电信
量子力学
雷达
频道(广播)
作者
Ling Wu,Zhonghua Ji,Wu Ma,Dianqiang Su,Yanting Zhao,Xiao Liu,Suotang Jia
出处
期刊:Applied Optics
[The Optical Society]
日期:2024-02-26
卷期号:63 (7): 1847-1847
被引量:1
摘要
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.
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