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利用有限元方法,考虑高脉冲能量高峰值功率激光系统对工作介质的要求,分析了一种大尺寸大宽厚比钕玻璃板条激光介质的热效应,给出了不同尺寸板条介质的温度、应力及形变分布。结果表明,采用大尺寸大宽厚比板条结构可以有效减小系统激光介质的热效应,并可通过牺牲少量通光口径来处理板条侧边效应问题,从而得到大的通光口径。根据数值模拟结果及系统对热效应和通光孔径的要求,给出了实际应用板条的参考尺寸。
Considering the working medium requirements of a high power laser system with high pulse energy, the thermal effect of a laser medium with a large aspect ratio neodymium glass slab is analyzed by using the finite element method. The temperature and stress of slab media with different sizes are given And deformation distribution. The results show that the large slab thickness ratio slab structure can effectively reduce the thermal effect of the system laser medium and can deal with the slab side effect by sacrificing a small amount of pass-through aperture to obtain a large aperture. According to the numerical simulation results and the requirements of the system for the thermal effect and the clear aperture, the reference dimensions of practical slats are given.