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为了研究标准激光光源近场空域测量精度,在理论方面建立了标准激光光源近场强度分布的理论模型,在实验方面提出了科学级CCD面响应非均匀性校正方案和激光近场计算算法。利用非均匀性校正后的科学级CCD和二维扫描装置,在1053nm标准激光光源软边光阑50mm×50mm口径内S形扫描,通过子孔径拼接得到标准激光光源近场图像。近场分布测试结果与理论值一致,差异主要是因为离轴抛物面镜表面粗糙度与科学级CCD随机噪声产生了高频分量。对近场参数测试结果进行分析,调制度扩展不确定度为0.08(k=2),对比度扩展不确定度为0.01(k=2)。研究结果提高了国家大科学工程激光参数测量系统近场空域测试置信度。
In order to study the near-field airspace measurement accuracy of a standard laser light source, a theoretical model of the near-field intensity distribution of a standard laser light source is established in theory. A scientific-level CCD surface response non-uniformity correction scheme and a laser near field calculation algorithm are proposed experimentally. The non-uniformity corrected CCD and 2D scanning device were used to S-scan in a 50mm × 50mm aperture of a 1053nm standard laser light source. The near-field image of a standard laser light source was obtained by subaperture splicing. The near-field distribution test results are consistent with the theoretical values, the difference is mainly due to the high frequency components generated by the surface roughness of the off-axis parabolic mirror and the random noise of the scientific level CCD. The results of near-field parametric test were analyzed. The uncertainty of expansion of modulation was 0.08 (k = 2), and the contrast expansion uncertainty was 0.01 (k = 2). The results improve the confidence of near-field airspace testing of the National Large Scientific Engineering Laser Parametric Measurement System.