非均匀偏振光束通过环状光阑的传输

Propagation of nonuniformly polarized beams through an annular aperture

使用光束相干偏振矩阵方法,推导出非均匀偏振光束通过环状光阑后偏振度和光强分布的表达式,研究了非均匀偏振光束通过环状光阑后偏振度和光强的变化。结果表明,在横平面上通常偏振度为非均匀分布,但在中心区域近似为均匀分布,均匀分布范围与非均匀偏振光束参数、光阑遮拦比和传输距离有关。初始为均匀分布的光强通过光阑后变为具有中心主极大和小衍射旁瓣的非均匀分布。

By using the beam eoherenee-polarization（BCP） matrix method, the expressions for the degree of polarization and intensity of nonuniformly polarized（NUP） beams propagating through an annular aperture are derived, whieh enable to study the changes in the degree of polarization and intensity of NUP beams propagating through the annular aperture. It is shown that, the degree of polarization is usually nonuniform, but is nearly uniform in the eentral region at the transversal plane, whieh depends on the NUP beam parameters, obseure ratio of the aperture and propagation distanee. The uniform intensity of NUP beams beeomes non-uniform with a eentral prineipal maximum and small diffraetion side lobes after passing through the aperture.