光阑对高斯谢尔模型光束偏振特性的影响

根据光束的相干-偏振矩阵理论,应用柯林公式对部分相干光经光阑衍射后的轴向、横向偏振特性从近场区到远场区的演化规律进行了详细的数值计算。经研究表明,由于光阑的衍射效应,使得高斯谢尔模型光束的偏振出现非均匀分布,光束偏振度沿轴向、横向分布出现多峰振荡现象,并且随着光阑截断参数的减小、光束空间相干长度的增大和传输距离的增大,多峰振荡逐渐增强。光束在自由空间沿轴向传输时,在近场区偏振度分布均匀,与源平面相同,随着传输距离的增大和空间相干长度的减小,偏振度沿轴向分布逐渐增大,无振荡现象。

Effect of the polarization properties of Gaussian Schell-model beams on rectangular aperture

Based on the beam coherence-polarization matrix and Collins formula,Compared with previous results,the evo- lution relationship from near-field to far field of the on-axis and on-radial polarization properties of Gaussian Schdl-model beams diffracted through a rectangular aperture are studied numerically.It is shown that,as diffraction effect,the polarization distri- bution of Gaussian Schell-model beams becomes non-uniform,there are oscillations of the on-axial and on radial polarization distribution,with increasing of the truncation parameter and decreasing of spatial coherence parameters and transmission dis- tance,Oscillations strengthen gradually.When the beams upon free space transmit on axis,polarization distribution in the near field is uniform,as same as that of source plane,with increasing of transmission distance and decreasing of spatial coherence pa- rameters.The on-axial polarization distribution increases,there are no oscillations