部分相干平顶光束经过双焦距薄透镜的传输特性研究

Propagation Properties of Partially Coherent Flat-topped Beam Passing through Astigmatic Lens

利用一种新型部分相干平顶光束模型(这种光束的交叉光谱密度可以由一系列具有不同参数的部分相干高斯-谢尔模光束的交叉光谱密度叠加而成),着重讨论分析了它经过双焦距透镜的一些传输特性。研究结果表明,部分相干平顶光束经过双焦距透镜后光强的分布在两个焦平面上最为集中,呈现出两个高低不同的峰,而峰值的演化跟部分相干平顶光束的阶数N以及相干性都有很大的关系。

Applying a new mathematical model of partially coherent flat-topped beam,the cross-spectral density of which can be expressed as finite series of the cross-spectral density of partially coherent Gaussian-Schell model beans with different parameters,the propagation properties of partially coherent flat-topped beam passing through astigmatic lens are calculated and illustrated.The results show that the intensity distribution of partially coherent flat-topped beam passing through astigmatic lens occurs shows two different peaks at two focusing planes and the evolution of the peaks is closely related to the order and the coherence of partially coherent flat-topped beam.