Experimental validation of a simple approximation to determine the linewidth of a laser from its frequency noise spectrum

被引：41

作者：

Bucalovic, Nikola ^{[1
]}

Dolgovskiy, Vladimir ^{[1
]}

Schori, Christian ^{[1
]}

Thomann, Pierre ^{[1
]}

Di Domenico, Gianni ^{[1
]}

Schilt, Stephane ^{[1
]}

机构：

[1] Univ Neuchatel, Lab Temps Frequence, Inst Phys, CH-2000 Neuchatel, Switzerland

来源：

APPLIED OPTICS | 2012年 / 51卷 / 20期

基金：

瑞士国家科学基金会;

关键词：

PHASE NOISE;

D O I：

10.1364/AO.51.004582

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Laser frequency fluctuations can be characterized either comprehensively by the frequency noise spectrum or in a simple but incomplete manner by the laser linewidth. A formal relation exists to calculate the linewidth from the frequency noise spectrum, but it is laborious to apply in practice. We recently proposed a much simpler geometrical approximation applicable to any arbitrary frequency noise spectrum. Here we present an experimental validation of this approximation using laser sources of different spectral characteristics. For each of them, we measured both the frequency noise spectrum to calculate the approximate linewidth and the actual linewidth directly. We observe a very good agreement between the approximate and directly measured linewidths over a broad range of values ( from kilohertz to megahertz) and for significantly different laser line shapes. (C) 2012 Optical Society of America

引用

页码：4582 / 4588

页数：7