新型部分相干光束的产生及其相干特性

Generation of a New Kind Partially Coherent Beam and Its Coherent Properties

利用相干理论,研究了新型部分相干光束的相干特性.用激光光束透过旋转的特殊毛玻璃,产生一种相干性分布特殊的新型部分相干光束.实验上经双孔干涉,记录了该光束经不同小孔间距双孔产生的干涉条纹,计算得出所对应的相干度,并获得了该光束在不同传输距离下的相干度分布情况,发现该光束的相干度分布与高斯-谢尔模型光束的相干度分布不相同,其相干度随着传输距离的增大而变强.

Based on the coherent theory, the coherent properties of the new partially coherent beam were studied. The new partially coherent beam with the specific distribution of coherence was formed by the laser passing through a rotating special ground glass. The interference fringes produced by this beam passing through some double-holes with different hole spaces were experimentally recorded and their corresponding coherence degree was calculated. The coherence distributions of this beam under different propagation distances were experimentally investigated. The results show that, the coherence distributions of this beam are different with those of Gaussian Schell-model beams, and the degree of coherence increases with the increasing of propagation distances.