基于光纤延时声光频移自差拍法快速测量激光线宽

发布时间：2018-04-10 15:36

本文选题：激光光学 + 窄线宽光纤激光器　；参考：《激光与光电子学进展》2016年06期

【摘要】：基于光纤延时声光调制器(AOM)频移自差拍法实验研究了不同线宽激光的功率谱特性,并作了相关的仿真分析;同时,提出了利用短光纤测量窄线宽激光器线宽的一种简单方法。当光纤延时时间小于激光器的相干时间时,自差拍频谱的3dB带宽不能直接用于标定激光线宽。理论分析和实验均表明,此时激光的线宽信息主要由自差拍频谱中两翼的周期性振荡成分决定,几乎不受中央尖峰的影响。根据最小二乘法理论,对实验所测的自差拍频谱进行理论拟合可获得待测激光的线宽。该方案基本不受延时自差拍系统最小分辨率的限制,可以用于激光线宽的快速测量,特别是窄线宽激光的测量。
[Abstract]:Based on optical fiber delay acousto-optic modulator (AOM), the power spectrum characteristics of different linewidth lasers are experimentally studied and simulated, and a simple method for measuring the linewidth of narrow linewidth lasers using short fiber is proposed.When the fiber delay time is less than the coherent time of the laser, the 3dB bandwidth of the self-aberration spectrum can not be used to calibrate the laser linewidth directly.Theoretical analysis and experiments show that the linewidth information of the laser is mainly determined by the periodic oscillation components of the two wings in the self-aberration spectrum, and is almost independent of the central peak.According to the theory of least square method, the linewidth of the laser to be measured can be obtained by theoretical fitting of the spectrum of self-aberration beat measured in the experiment.This scheme is not limited by the minimum resolution of time-delay self-beat system and can be used for fast measurement of laser linewidth, especially for narrow linewidth laser measurement.
【作者单位】：山西大学光电研究所量子光学与光量子器件国家重点实验室;
【基金】：国家重大科学研究计划(2012CB921601) 国家自然科学基金(61475091;11274213;61227902)
【分类号】：TN248

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