机构地区: 内江师范学院工程技术学院
出 处: 《激光杂志》 2015年第10期13-17,共5页
摘 要: 提出用2×2交叉谱密度矩阵描述空间-频率域中部分相干电磁光束非相干合成光束的二阶相关性。利用广义惠更斯-菲涅耳原理推导出电磁高斯谢尔模型光束非相干合成光束在自由空间中传输的光谱密度和偏振度的解析公式。重点研究阵列参数、自相关长度、互相干长度和传输距离对非相干合成光束偏振度的影响。对所得结果用数值计算做了说明。 The 2×2 cross-spectral density matrix is put forward to describe the second-order correlation of incoherent combination of stochastic electromagnetic beams in the space- frequency domain. The analytical formulas of spectral density and the degree of polarization of incoherent combination of electromagnetic Gaussian- Schell model beams propagating in free space are deduced by using the generalized Huygens-Fresnel principle. The effect of the parameters of the array,self-and cross-correlation lengths on the spectral density and the degree of polarization of incoherent combination of stochastic electromagnetic beams are stressed. The results are illustrated by numerical examples.
关 键 词: 非相干合成 电磁高斯谢尔模型光束 偏振度