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激光强度时空分布的测量对于诊断与评估激光系统的性能具有重要意义,减少激光入射角度影响、对大尺度激光束进行高分辨力、高占空比取样是准确测量激光强度分布的关键,结合漫散射光分布与入射光方向无关的原理,提出了激光强度时空分布测量漫散射取样衰减方法,设计了漫散射取样衰减单元,建立了光强计算模型,推导了光强计算公式并进行了验证,光强衰减倍数实验结果与理论值一致。介绍了漫散射取样衰减装置与光电管阵列或CCD成像系统的组合应用。该方法的优点:空间取样分辨力高,可达2mm左右;使用角度宽,可达±30°而不需要响应修正;占空比高,可达40%以上;衰减倍数范围大,可以通过调节衰减结构参数实现任意需要的衰减倍数。漫散射取样衰减为阵列探测器对大尺寸激光束进行取样和衰减提供了一种新方法,提高了激光强度分布测量能力和测量精度。
The measurement of the spatiotemporal distribution of laser intensity is of great significance for the diagnosis and evaluation of the performance of the laser system. To reduce the impact of the laser incident angle, high resolution and high duty cycle sampling of a large-scale laser beam is the key to accurately measure the laser intensity distribution. The principle of scattered light distribution has nothing to do with the direction of incident light. A method to measure the diffuse scattering attenuation by spatiotemporal distribution of laser intensity is proposed. The diffuse scattering sample decaying unit is designed, the light intensity calculation model is established, the light intensity calculation formula is deduced, The experimental results of light intensity attenuation are consistent with the theoretical values. The combined application of diffuse scattering sampling attenuation device and photoelectric tube array or CCD imaging system is introduced. The advantages of this method are as follows: high sampling resolution of space, up to 2mm; wide angle of use up to ± 30 ° without the need of response correction; high duty cycle up to 40%; large attenuation range, Decay structure parameters to achieve any desired attenuation multiple. The diffuse scatter sampling attenuation provides a new method for the array detector to sample and attenuate large laser beams, improving the laser intensity distribution measurement capability and measurement accuracy.