赝热光源是关联成像的常用光源,相较量子态的纠缠双光子光源,它更容易获得并用于关联实验.赝热光和纠缠双光子有一定的相似之处,尤其是在光场的统计特性上,这一点和关联计算密切相关.当量子场为相干态或其经典随机混合时,量子光场和经典光场在统计特性上完全相同,可采用零均值高斯态对赝热光场的非相敏传播过程进行完整描述.基于这一模型,建立了赝热光场的半经典探测理论,推导了参考光路和信号光路光电流的关联计算公式,对鬼成像的分辨率和对比度以及关联成像系统的视场进行了分析.
Pseudo-thermal light is a regular source for correlated imaging.Compared to entangled twophoton source of quantum state,it can be easily obtained and used in correlation experiment.Pseudothermal light and entangled two-photon have certain similarities,especially in statistic characteristics of light field,which is closely related to the correlated calculation.When the quantum field is a coherent state or classically-random mixture of coherent states,statistic characteristics of the quantum field and classical field are all the same.The zero-mean Gaussian state can be used to describe fully the phase-insensitive coherence propagation of pseudo-thermal light.Based on this model,semi-classical detection theory of pseudo-thermal light is established.The correlation calculation formula of photocurrent in reference path and signal path are derived.The resolution and contrast of ghost imaging and view field of correlated imaging system are analyzed.
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