论文部分内容阅读
为了抑制大口径光学元件中的受激Brillouin散射效应,并满足打靶过程中束匀滑的要求,目前高能激光驱动器大都采用了正弦相位调制脉冲.然而,这类脉冲在复杂激光系统中传输时,会出现明显的调频-调幅(FM-to-AM)效应.研究这种效应的来源,对提升激光系统的整体输出性能至关重要.对复杂激光系统中一直被人们所忽视的平板光学元件带来的FM-to-AM效应进行了理论研究和数值模拟.数值模拟结果表明,通过平板光学元件的次数越多调制深度越大,呈线性递增趋势,当通过次数为10次时,调制深度高达22.2%;并且平板光学元件对各谱线的过滤也各不相同,当前端选用的中心波长为1054 nm时,平板光学对各谱线的过滤作用非常小.提出通过改变中心波长来减小FM-to-AM效应,这对于复杂激光系统的设计具有重要的指导意义.
In order to suppress the stimulated Brillouin scattering in large-aperture optics and meet the requirements of beam smoothing in the process of target generation, most of the current high-energy laser drivers use sinusoidal phase modulation pulses. However, when such pulses are transmitted in complex laser systems, There will be obvious FM-to-AM effect.It is very important to study the source of this effect to improve the overall output performance of the laser system.For the complex laser system has been neglected by the flat optical components with The numerical simulation results show that the greater the number of slab optical elements, the greater the modulation depth and a linear increasing trend. When the number of passes is 10, the modulation depth is as high as 22.2%; and the flat optics filter of each spectrum is also different, when the front-end selection of the center wavelength of 1054 nm, the flat-panel optics filtering of each spectrum is very small.It is proposed by changing the center wavelength to reduce the FM -to-AM effect, which is of great significance to the design of complex laser systems.