千瓦级低透射波前畸变端抽运板条增益模块技术研究

Study on kW-Class Small Wavefront Distortion End Pumped Slab Gain Module

基于端抽运板条增益模块的主振荡器功率放大(MOPA)是高平均功率激光二极管抽运激光器(DPL)发展的有效途径之一,近年来受到广泛关注。通过理论分析和数值模拟,建立了板条增益模块的设计模型,分析了板条增益模块的小信号增益系数、输出特性、温度和热应力等关键参数。研制的模块尺寸为50cm(长)×30cm(宽)×20cm(等),静态波前畸变为0.22μm(不包括倾斜),实验研究获得了均匀性约94%的荧光分布,在占空比为60%条件下,输出平均功率1086.3W,斜率效率41.7%。

The master oscillator power amplifier（MOPA） based on end pumped slab gain medium is one way to develope high average power laser diode pumped laser（DPL）,attracts widespread attention in recent years.By using theoretical analysis and numerical simulation,the design models of slab gain module are established,and then the small-signal gain coefficient,the output characteristics,the temperature and the thermal stress of the slab gain module are obtained.The size of module is 50 cm（length）×30 cm（width）×20 cm（height）.The static wavefront distortion is 0.22 μm（excluding tilt）.The uniformity of fluorescence distribution is achieved by 94%.The average output power is achieved by 1086.3 W at duty cycle of 60%,and the slope efficiency is 41.7%.