摘要
为了优化半导体激光自混合振动测量系统,本文采用三镜腔理论模型,结合激光自混合振动测量的实验结果,利用数值模拟的方法对激光自混合振动信号进行仿真分析,获得了不同外腔耦合系数ζ(0.25×10-4～1.75×10-4)以及不同半导体激光器(LD)线宽展宽因子α(1～5)下自混合振动测量信号的时域特性。结果表明,较大的外腔耦合效率ζ和LD线宽展宽因子α能够获得信噪比更大、方向性更好的激光自混合振动波形。
In order to optimize the self-mixing interference,a theoretical analysis on the self-mixing interference is presented by using a three-mirror cavity model to optimize the self-mixing vibration measurement system.Combining with the experimental results of the self-mixing vibration measurement system,the time domain characteristics of self-mixing signal are obtained corresponding to the external cavity coupling efficient ζ parameter from 0.25×10-4 to 1.75×10-4 and the linewidth enhancement factor parameter α from 1 to 5.The results indicate that larger external feedback strength and linewidth enhancement factor of laser diode（LD） can enhance signal to noise ratio（SNR） and in favor of direction discrimination.
出处
《光电子．激光》
EI
CAS
CSCD
北大核心
2010年第8期1159-1162,共4页
Journal of Optoelectronics·Laser
基金
国家自然科学基金资助项目(60940022)
安徽省教育厅重点科研计划资助项目(KJ2010A019)
