1维部分相干光束的Z扫描理论分析
Theoretical analysis of Z-scan using one dimensional partially coherent beams
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摘要: 对使用高斯-谢尔模型光束的Z扫描做了理论分析，研究了光阑半径和空间相干度变化对Z扫描曲线的影响。研究发现：随着光阑半径的变大，Z扫描峰谷透过率之差逐渐减小直至为零，其作用效果与完全相干光一致；随着空间相干度的增加，峰谷透过率之差也逐渐增大，当空间相干度大于某一定值后，峰谷透过率之差达到饱和不变。部分相干光束的Z扫描实验为测量其空间相干度提供了一种可行的方法。Abstract: A theoretical analysis on Z-scan using Gaussian-Schell model beam is reported. The influences of aperture radius and degree of spatial coherence on the Z-scan curves are studied. It is found that the effect of aperture radius on the Z-scan curves is similar to the case of the fully coherent beams. It is also shown that the difference between peak and valley transmittance is getting larger with the increasing degree of spatial coherence till it stabilizes when the degree of spatial coherence is larger than a certain value. The results show that the Z-scan experiment with partially coherent beams may provide a feasible method for measuring the degree of spatial coherence.
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