光子学报, 2014, 43 (10): 1010002, 网络出版: 2014-11-06
高动态范围激光焦斑测量数学模型研究
Mathematical Model for the Measurement of High Dynamic Range Laser Focal Spot
高动态范围 远场焦斑测量 快速准直 纹影法 主瓣 旁瓣 纹影重构 High dynamic range The measurement of far-field focal spot Fast automatic alignment Schlieren method Main lobe Side lobe Schlieren reconstruction
摘要
提出了一种高动态范围的激光焦斑测量方法.首先,构建纹影测量远场焦斑数学模型,确定重构需要的参数,并使用准直光路对参数进行标定;其次,运用综合诊断快速自动准直系统使纹影小球遮挡住旁瓣光斑中心,获得准确的旁瓣光斑;最后,改进计算纹影小球中心及图像融合等方面的纹影重构算法,克服了传统纹影重构方法中主瓣旁瓣中心误差大、合并图像拼接边缘台阶明显的缺点.对大型激光装置参数测量综合诊断系统的远场焦斑测量应用表明:通过对纹影测量远场焦斑数学模型中参数的精确标定以及对纹影重构算法的优化,能够实现高动态范围激光焦斑的准确测量.
Abstract
A measurement method of the high dynamic range laser focal spot was proposed. First of all, the mathematical model of schlieren method to measure the far-field focal spot was constructed,the main lobe intensity amplification coefficient and the laser spot amplification coefficient were confirmed, and the parameters were calibrated by automatic alignment laser beam; Secondly, the schlieren ball was put in focus position of side lobe laser beam to shade the spot centre and side lobe image was captured accurately by integrated diagnostic beam fast automatic alignment system; Finally, the schlieren reconstructed algorithm was optimized by calculating side lobe image centre and image fusion, and the error of traditional schlieren reconstruction method for side lobe center was decreased and the obvious edge of reconstructed image was eliminated. The application in parameter measurement integrated diagnostic system of the high power laser facility to measure far-field laser focal spot shows that the method can measure the far field distribution of high dynamic range laser focal spot exactly if the parameter of the mathematical model is calibrated accurately and the schlieren reconstructed algorithm is optimized.
王拯洲, 王伟, 夏彦文. 高动态范围激光焦斑测量数学模型研究[J]. 光子学报, 2014, 43(10): 1010002. WANG Zheng-zhou, WANG Wei, XIA Yan-wen. Mathematical Model for the Measurement of High Dynamic Range Laser Focal Spot[J]. ACTA PHOTONICA SINICA, 2014, 43(10): 1010002.