高功率激光系统中热像的传输及预判技术

发布时间：2018-04-10 21:53

本文选题：激光技术 + 高通量密度　；参考：《中国激光》2017年09期

【摘要】：比较了高通量密度下损伤点分别位于上游介质的前后表面时热像的位置及峰值光强的区别。讨论了热像交替排布的现象及峰值光强随损伤点尺寸的变化规律。针对上游光学元件中的损伤点是诱发后续光路中热像的主要因素,提出了以损伤点经一定传输距离后引起的衍射环图像为分析对象的热像预判技术。该技术运用高信噪比的梯度方向匹配算法来获取衍射环图像的特征信息,进而反演出衍射距离和损伤点尺寸。利用液晶空间光调制器产生的单个等效损伤点的衍射图像证明了该方法的有效性;并采用光学元件上实际存在的损伤点所引起的衍射环图像分析了该算法反演多个损伤点时抑制噪声干扰的能力及其空间分辨率。
[Abstract]:The position of thermal image and the difference of peak light intensity between the damage points located on the front and back surfaces of the upstream medium at high flux density were compared.The phenomenon of alternating arrangement of thermal images and the variation of peak light intensity with damage point size are discussed.In view of the fact that the damage point in the upstream optical element is the main factor that induces the thermal image in the subsequent optical path, a thermal image prediction technique based on the diffraction ring image caused by the damage point passing through a certain transmission distance is proposed.The gradient direction matching algorithm with high signal-to-noise ratio is used to obtain the characteristic information of the diffraction ring image, and then the diffraction distance and the damage point size are inversed.The effectiveness of the method is proved by the diffraction images of a single equivalent damage point generated by a liquid crystal spatial light modulator.The diffraction ring images caused by the actual damage points on the optical elements are used to analyze the ability and spatial resolution of the algorithm to suppress noise interference when retrieving multiple damage points.
【作者单位】：中国科学院上海光学精密机械研究所高功率激光物理联合实验室;中国科学院大学;
【分类号】：TN249

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