中国激光, 2009, 36 (11): 2893, 网络出版: 2009-11-11
脉冲式赝热光源的实验研究
Research on the Pulsed Pseudo-Thermal Light
量子光学 强度关联量子成像 脉冲式赝热光源 散斑 二阶关联函数 交叉谱纯 quantum optics intensity correlated quantum imaging pulse pseudo-thermal light speckle second order correlation function cross-spectrally pure
摘要
高亮度的辐照热光源一定程度上限制了基于经典热光场的强度关联量子成像技术的实验研究和广泛应用。因为一般热光源相干时间极短,且每个相干元胞内光子数少(亮度低),而采用激光照射旋转毛玻璃形成的动态散斑作为赝热光场可以解决上述问题。当采用的是纳秒脉冲激光时,得到的赝热光场除了能极大程度地模拟真实热光场的热涨落,光场涨落服从真实热光场所具有的高斯统计分布以外,另一个最重要的特性是光场涨落的测量不受光电探测系统有限通频带的限制,即使是慢响应探测电路,也能准确地记录光场抖动,即该光场符合交叉谱纯条件。
Abstract
The intensity correlated quantum imaging experiment and application with thermal light restricted by the high bright thermal light to some extent. The coherence time is shorter,and the number of photons in a coherent cellular is smaller because of true thermal light,so true thermal light is replaced by pseudo-thermal light,which can be obtained by a laser transmitting through rotary ground glass. When a nanosecond laser is used,the source simulates the intensity fluctuation of true thermal light extremely,and obeys to Gauss statistical distribution property. In addition,the important property is that the measurement to intensity fluctuation isn’t limited by finite pass band of the photo-detector. Even in the case of slower response detector,the intensity fluctuation can be recorded accurately,and the light field is cross-spectrally pure.
沈夏, 张明辉, 刘红林, 韩申生. 脉冲式赝热光源的实验研究[J]. 中国激光, 2009, 36(11): 2893. Shen Xia, Zhang Minghui, Liu Honglin, Han Shensheng. Research on the Pulsed Pseudo-Thermal Light[J]. Chinese Journal of Lasers, 2009, 36(11): 2893.