Spectrum Properties of Partially Coherent Modified Bessel-Gauss Beams Passing Through an Aperture Lens
部分相干修正贝塞尔高斯光束通过光阑透镜的光谱特性

Based on the propagation theory of partially coherent light, the spectral shift and spectral switch of partially coherent modified Be ssel-Gauss beams passing through an aperture lens are studied. Numerical result s show that the spectral shift and spectral switch of partially coherent modifie d Bessel-Gauss beams are dependent upon the spectral degree of coherence, Fresn el number and truncation parameter. The number of spectral switch increases with increasing Fresnel number and truncation parameter, but decreases with increasi ng spectral degree of coherence. When the truncation parameter is larger than a certain value, the spectral switch disappears. For example, when the spectral de gree of coherence equals to 0.5, and the truncation parameter is larger than 2.2 , the spectral switch disappears and there is only the blue shift.