作　　者： ; ; ; ;

机构地区： 中国科学院合肥物质科学研究院

出　　处： 《光学学报》 2010年第5期1315-1320,共6页

摘　　要： 介绍了一种新型的辐亮度绝对定标的方法原理和实验装置。采用355 nm激光抽运偏硼酸钡(BBO)晶体,产生两个下转换光子波长分别为532.75 nm和1064 nm。利用这对可见-红外下转换相关光子对在时间、空间上的高度相关性,在红外下转换光子方向注入1064 nm待测激光光源,通过测量532.75 nm的下转换光子信号的光子计数,实现1064 nm激光光源辐亮度的绝对定标,并将红外波段的测量转移到了可见光谱区域内。改变待测激光光源的功率,实验结果显示具有较好的线性。实验过程中设置输入光功率为3.39 mW,在对系统的各项损耗和效率进行评估的基础上,测量得到相应的辐亮度大小为4.09×1017W/(m2.sr),相对不确定度为4.78%。 A new absolute method of radiance calibration was introduced,including the principle and its experimental setup.An ultraviolet laser（355 nm） was used to pump the nonlinear crystal BBO（β-BaB2O4）,producing two correlated-photons whose wavelengths were 532.75 nm and 1064 nm,respectively.The under-calibrated laser was injected along the propagation of the infrared down-converted photons.With the high correlativity of the two VIS-IR correlated photons,through the measurement of the visible down-converted photons,the radiance of the injected laser source can be calculated,allowing the radiance of an infrared source can be measured with the high-quality visible detectors.The measurement result shows good linearity at different power of injected laser.At last,based on the estimate of the efficiency factor of the system,the radiance at a fixed power of 3.39 mW was calibrated,with the result 4.09×1017 W/（m2·sr） and its relative uncertainty 4.78%.

关 键 词： 遥感 绝对定标 参量下转换 辐亮度 相关光子

领　　域： [机械工程] [理学] [理学]