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基于颗粒物米氏散射特性、激光自混合三镜腔理论和激光器稳态条件,推导出在大气颗粒物光反馈下激光器频率、功率、线宽的理论表达式,建立了大气颗粒物光反馈下的激光自混合理论模型。同时,数值模拟和分析了大气颗粒物物理参数对激光自混合干涉信号的影响。结果表明,在一定粒径范围内,激光自混合反馈强度随大气颗粒物粒径增大先增大后减小,且反馈强度峰值出现的位置随颗粒物折射率实部的增大、虚部的减小向粒径较大处移动;自混合系统的外腔长度影响自混合干涉信号的波动深度,激光器输出光信号的幅值随外腔长度增大呈指数衰减;自混合干涉信号波动频率与大气颗粒物运动速度呈线性关系。分析结果对基于激光自混合效应的大气颗粒物多物理参数传感具有重要作用。
Based on the Mie scattering properties of particles, the self-mixing three-cavity laser theory and the steady-state conditions of the laser, the theoretical expression of the laser frequency, power and linewidth under atmospheric feedback is deduced. The laser self- Mixed theory model. At the same time, numerical simulation and analysis of the physical parameters of atmospheric particles on the laser self-mixing interference signal. The results show that the laser self-mixing feedback intensity firstly increases and then decreases with the particle size of the atmospheric particles within a certain particle size range, and the position where the peak value of the feedback intensity appears increases with the real part of the refractive index of the particle, The length of the self-mixing system affects the fluctuation depth of the self-mixing interference signal, the amplitude of the laser output optical signal exponentially decays with the increase of the external cavity length; the frequency of the self-mixing interference signal fluctuates with the atmospheric pressure Particle velocity is linear. The results of the analysis play an important role in sensing multi-physical parameters of atmospheric particulates based on laser self-mixing effect.