摘要
考虑激光器外腔由在不同方面上的独立运动的反射镜构成,形成多路反馈时所产生的自混合干涉(SMI)现象,运用光干涉的基础理论,结合激光自混合干涉理论对弱光反馈条件下的多路反馈外腔(MFEC)结构的自混合干涉理论进行研究。基于两路反馈外腔结构,构造了一个含有两路反馈外腔结构的自混合干涉模型,并对所提出的结构进行理论分析及数值仿真。得出在弱光反馈条件下,两路反馈外腔结构的自混合干涉信号类似于低频率正弦相位调制的激光自混合干涉信号,为幅度周期性变化的类正弦波或类锯齿波,其干涉信号波形形状由外部反馈的强弱决定,且一个周期内的波形信号疏密程度不同。搭建相关实验系统,对仿真结果进行了验证。
The external cavities of laser formed by independent movement reflectors in different directions is consided, the self-mixing interference （SMI） effect with multiway feedback is investigated. The basic theory of SMI with multiway feedback external cavity （MFEC） can be obtained by the theory of interference and the theory of laser SMI. Based on the external cavity structure with two feedback, a SMI model with two feedback external cavity structure is proposed. The expressions of the phase and output power in the MFEC are deduced and some simulations are made under different conditions. It is found that the output of the SMI system with two external cavities in different directions is sinusoidal or sawtooth waves, which is similar to the signal of SMI by low frequency sinusoidal phase modulation. The density of interference waves is uneven in one period and the shape of the interference wave is determined by the intensity of the external feedback. A SMI with two feedback external cavity experiment system is setup, and the experiment results testifies the validity of simulations.
出处
《激光与光电子学进展》
CSCD
北大核心
2015年第6期134-139,共6页
Laser & Optoelectronics Progress
基金
国家自然科学基金(61308072)
关键词
测量
多路反馈
平面波干涉
自混合干涉
measurement
multiway feedback
plane wave interference
self-mixing interference
