论文部分内容阅读
基于光束在各向异性介质中的傍轴矢量传输理论,对环状平顶光束在单轴晶体中垂直于光轴的传输作了研究,导出了偏振场的慢变振幅表达式,并通过数值计算分析了光束的传输特性。结果表明,环状平顶光束在单轴晶体中垂直于光轴传输时,晶体的各向异性对其光强分布有较大影响,在正单轴晶体远场处ne/no值越大,光强越小,光束在xy平面内扩散越小;在负单轴晶体中传输性质则相反;随传输距离z的增加,中心光强逐渐加强,光强分布不再保持原来暗中空分布的特性。
Based on the theory of paraxial vector transmission of light beams in anisotropic media, the transmission of annular flat-topped beam perpendicular to the optical axis in uniaxial crystals was studied. The expression of slow varying amplitude of the polarization field was deduced, The transmission characteristics of the beam are calculated and analyzed. The results show that the anisotropy of the crystal has a great influence on the light intensity distribution when the annular flattened beam propagates perpendicularly to the optical axis in a uniaxial crystal. The greater the ne / no value is at the far field of the uniaxial crystal, The smaller the light intensity is, the smaller the light beam spreads in the xy plane; the opposite is true in the negative uniaxial crystal; the intensity of the center is gradually strengthened with the increase of the transmission distance z, and the light intensity distribution no longer maintains the characteristics of the original dark hollow distribution .