部分相干修正贝塞尔高斯光束通过光阑透镜的光谱特性

Spectrum Properties of Partially Coherent Modified Bessel-Gauss Beams Passing Through an Aperture Lens

基于部分相干光的传输理论,研究了部分相干修正贝塞尔高斯光束(MBGB)通过光阑透镜系统后,轴上光谱位移及光谱开关.数值计算结果表明,光谱开关主要与截断参量、光束菲涅耳数以及光谱相干度有关.光谱开关的个数随着光束菲涅耳数以及截断参量的增大将增多,而随光谱相干度的增大而减少.但当截断参量增大到一定值时,光谱开关将消失.例如,当光谱相干度取0.5时,截断参量大于2.2,光谱开关将消失,仅表现出蓝移.

Based on the propagation theory of partially coherent light, the spectral shift and spectral switch of partially coherent modified Bessel-Gauss beams passing through an aperture lens are studied. Numerical results show that the spectral shift and spectral switch of partially coherent modified Bessel-Gauss beams are dependent upon the spectral degree of coherence, Fresnel number and truncation parameter. The number of spectral switch increases with increasing Fresnel number and truncation parameter, but decreases with increasing spectral degree of coherence. When the truncation parameter is larger than a certain value, the spectral switch disappears. For example, when the spectral degree 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.