基于微扰法研究涡旋光束在大气中传输的热晕效应

基于一阶微扰法,推导了涡旋光束在大气中传输的稳态热晕解析表达式,并得到了由热晕引起的涡旋光束的相位畸变表达式.通过数值模拟涡旋光束在大气中传输的光强等值线分布,详细分析了传输距离、初始功率、横向风速、大气吸收系数和初始半径对涡旋光束热晕的影响.研究结果表明,在其他参数不变的情况下,单一增大涡旋光束的初始功率、传输距离和...

The thermal blooming effect of vortex beam propagation in the atmosphere is stud ied by perturbation method

Based on the first-order perturbation method,the analytical expressio n of steady-state thermal blooming for the propagation of vortex beam in the at m osphere is derived,and the phase distortion expression of vortex beam caused by thermal blooming is obtained.Through numerical simulation of intensity distrib ution of vortex beam propagation in the atmosphere,the effects of propagation d istance,initial power,transverse wind speed,atmospheric absorption coefficien t and initial radius on thermal blooming of vortex beam are analyzed in detail. The results show that the thermal blooming effect can be enhanced by increasing the initial power,propagation distance and atmospheric absorption coefficient o f vortex beam without changing other parameters.On the contrary,increasing the initial radius and transverse wind speed can reduce the thermal blooming effect without changing other parameters.Moreover,In the presence of transverse wind s,due to the thermal blooming effect,the vortex beam always bends in the direc tion of wind,and the position of peak intensity shifts,forming an asymmetric d istribution.The phase distortion of vortex beam caused by thermal blooming alon g wind direction and vertical direction is different.The results have important guiding significance for the application of high power laser in atmospheric pro pagation and the development of high energy laser.