Transverse Propagation Characteristics and Coherent Effect of Gaussian Beams
Fei Xiang1, Lin Zhang2, Tao Chen1, Yuan-Hong Zhong3, Jin Li4**
1State Grid Chongqing Electric Power Research Institute, Chongqing 401123, China 2State Grid Chongqing Electric Power Company, Chongqing 404000, China 3School of Microelectronics and Communication Engineering, Chongqing University, Chongqing 400044, China 4College of Physics, Chongqing University, Chongqing 401331, China
Abstract：As an important electromagnetic field in experiment, Gaussian beams have non-vanishing longitudinal electric and magnetic components that generate significant energy fluxes on transverse directions. We focus on the transverse energy flux and derive the theoretical propagation properties. Unlike the longitudinal energy flux, the transverse energy flux has many unique physical behaviors, such as the odd symmetry on propagation, slower decay rate on resonant condition. By means of the characteristics of transverse energy flux, it is feasible to find the suitable regions where the information of coherent lights could be extracted exactly. With the typical laser parameters, we simulate the energy fluxes on receiver surface and analyze the corresponding distribution for the coherent light beams. Especially for coherent lights, the transverse energy flux on the $y$–$z$ plane with $x=0$ and $x$–$z$ plane with $y=0$, contains pure coherent information. Meanwhile, in the transverse distance $|y| < 2W_{0}$ ($W_{0}$ is the waist radius) and $|x| < W_{0}/3$ the coherent information could also be extracted appropriately.
2020, Vol. 37 
