论文部分内容阅读
利用近轴射线近似法导出了曲板反射器所引入的交叉极化的简单公式。特别是,当反射器是旋转二次曲面,而波束的中心射线通过反射器的焦点时,高斯波束的最大交叉极化场的幅度,对轴向主极化场相对值,是式中e是自然对数的底;ξ是波束的1/e功率半径;k_⊥是垂直于入射平面反射器的曲率,θ是入射角。对于这样的反射器、波束场恰好可用每个极化平面的两个高斯模叠加来表示:基模,相应于主极化高斯波束,高次模用来计算交叉极化场和幅度“空间”锥削。通过一系列这样
Using the paraxial ray approximation, the simple formula of cross polarization introduced by the curved plate reflector is deduced. In particular, when the reflector is a rotating conic, and the center ray of the beam passes through the focal point of the reflector, the magnitude of the maximum cross-polarization field of the Gaussian beam, relative to the principal axis of polarization, is where e Ξ is the 1 / e power radius of the beam; k_⊥ is the curvature normal to the incident planar reflector and θ is the angle of incidence. For such a reflector, the beam field is exactly represented by two Gaussian modes superpositions for each polarization plane: the fundamental mode, corresponding to the main polarization Gaussian beam, and the higher order mode used to calculate the cross-polarization field and amplitude “space” Cone cut. Through a series of this