基于DSHI的窄线宽光纤激光器线宽测量  

Linewidth Measurement of Narrow Fiber Laser Based on the DSHI

作　　者：肖华菊[1,2] 王翔[1] 马云[1] 张洁[2] 

机构地区：[1]中国工程物理研究院流体物理研究所冲击波物理与爆轰物理实验室,四川绵阳621900 [2]西南交通大学机械工程学院,成都610031

出　　处：《光电工程》2010年第8期57-61,共5页Opto-Electronic Engineering

基　　金：冲击波物理与爆轰物理国防科技重点实验室基金资助项目(9140C6713020904)

摘　　要：窄线宽光纤激光器的线宽作为相干光学系统的重要参数需要进行准确的测定,延时自外差法(DSHI)是测量窄线宽比较理想的方法。本文讨论了DSHI测量线宽的基本原理,根据DSHI的功率谱表达式,利用MATLAB程序对不同光纤延迟线长度条件下的DSHI功率谱进行了仿真,并分析和讨论了光纤延迟线长度对线宽测量结果的影响。建立了1550nm波长的DSHI线宽测量系统,对IPG公司的光纤激光器线宽进行了测量。该系统用示波器代替频谱仪,并采用FFT软件算法对示波器获取的光电流信号进行分析,测得该激光器的线宽约为16kHz,在理想的精度范围内。As an important parameter of the coherent optical system,the linewidth of narrow fiber laser must be measured accurately.Compared with other currently available linewidth measurement techniques,the Delayed Self-heterodyne Interferometer（DSHI） technique is the most promising one.In this paper,theory of the DSHI for determining the linewidth of lasers is described in detail.The MATLAB emulator is programmed to analyze the effects of fiber delay line on the results.Furthermore,an experimental setup based on the DSHI is constructed to measure IPG＇s fiber laser linewidth.We substitute oscilloscope for the spectrum analyzer in this system,and the software algorithm is designed for the analysis of the photocurrent signal.From numerical analysis,the measured linewidth of the IPG＇s fiber laser is about 16 kHz,which is in the range of an ideal accuracy.

关 键 词：线宽测量 光纤激光器 DSHI 光纤延时 

分 类 号：TN247[电子电信—物理电子学] TN253