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为了研究高功率激光传输过程中不透明颗粒引起的光束调制,通过分析这些不透明颗粒的形状和分布特点,建立了位置呈随机分布的高斯状散射点模型,从光束的衍射理论和干涉叠加理论出发,得到该模型下散射点对传输光束质量影响的解析式。数值分析了高斯状散射点的大小、密度、散射面积比及其传输距离对输出光束的近场分布、位相分布和光束透过率的影响,结果显示亚毫米量级散射点的衍射效应引起最大调制可达1.4,光学元件散射面积比小于0.003时才能满足元件透过率大于99.5%的需求。该结果可用于评价高功率激光装置光学元件的加工状况,并对光学元件加工要求和激光装置的洁净度要求有指导意义。
In order to study the beam modulation caused by opaque particles during high power laser transmission, a Gaussian scattering point model with randomly distributed positions was established by analyzing the shape and distribution characteristics of these opaque particles. Based on the diffraction theory and interference superposition theory, The analytical expression of the influence of scattering point on the transmitted beam quality under this model is obtained. Numerical analysis of the Gaussian scattering point size, density, scattering area ratio and its transmission distance of the output beam near-field distribution, phase distribution and beam transmittance, the results show that the diffraction effect of sub-millimeter-scale scattering point causes the largest Modulation up to 1.4, the optical element scattering area ratio of less than 0.003 to meet the element transmittance greater than 99.5% of the demand. This result can be used to evaluate the processing status of optical components in high power laser devices and to guide the processing requirements of optical components and the cleanliness requirements of laser devices.