The generalization of an elliptical Gaussian beam is presented by introducing a complex shift in the transverse coordinates.
在椭圆高斯光束横坐标中引入复数偏移量，将其推广为偏心椭圆高斯光束。
2
The development of spectral method on elliptical and hyperbolic problems is summarized, and spectral method under sphere coordinates and polar coordinates is touched too.