近年来,光场的相干性理论受到国内外学者的广泛关注。传统光学研究的主要是光场的一阶相干性,HBT实验的成功打破了传统光学的局限性,开拓了相干性的物理含义。在传统光学和相干性理论研究的基础上,提出了四阶关联的概念和实验方案。通过将四阶关联函数用它的一阶形式来表示,并考虑到四个探测器处的光场强度,对计算结果中的每一项进行分析,区分出其中的背景噪声和对成像有贡献的部分,研究表明四阶关联成像在理论上是可以实现的。
Recently coherent of light field is attracting more attention by domestic and foreign scholars.First-order coherence has been mainly investigated in traditional optics.Further,the successes in HBT experiment break the limitations of traditional optics which develop the physical meanings of the coherence.In this paper,we propose a concept and experimental sheme of fourth-order correction based on the traditional optics and coherent theory.Through the analysis on fourth-order correction function carefully,we express the fourth-order correction function with its first-order form and calculate by considering the light intensity from the four detectors.We show the background noise and the part of imaging by analysizing the results in our calculation.We obtain that it is realizable in fourth-order correction imaging theoretically.