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设计并研究了双晶四端泵浦的Tm:YLF激光器。利用Ansys软件中的稳态热分析模块计算了散热底板水通道在热交换系数分别为1000W/(m~2·℃)、4000W/(m~2·℃)、8000W/(m~2·℃)和15000W/(m~2·℃)以及采用TEC制冷时对应的晶体夹具及散热底板的温度分布。根据计算结果,在采用水温16℃中等强制对流及以上时与TEC制冷控温18~20℃时对Tm:YLF晶体冷却效果近似,可近似等效于TEC制冷。根据模拟计算的结果,设计了可用光纤耦合半导体激光器泵浦的U型腔结构Tm:YLF激光器。在采用16℃冷却水直接冷却晶体夹具时,单晶双端泵浦和双晶四端泵浦的Tm:YLF输出功率分别达到了25.9W和46W的激光输出,对应的斜效率分别为40.7%和37.1%。在实验过程中,晶体夹具未出现温度过高。实验结果说明设计的直接传导冷却系统可有效地冷却泵浦功率在140W时的双晶四端泵浦结构Tm:YLF晶体。
A dual-crystal, four-terminal pumped Tm: YLF laser was designed and studied. Using the steady-state thermal analysis module in Ansys software, the effects of heat exchange coefficient of water channel of heat-dissipating floor at 1000W / (m ~ 2 ℃), 4000W / (m ~ 2 ℃), 8000W / (m ~ 2 ℃ ) And 15000W / (m ~ 2 · ℃) and the TEC cooling corresponding crystal fixture and the cooling floor temperature distribution. According to the calculation results, the cooling effect of Tm: YLF crystal is similar to that of TEC cooling when the water temperature is 16 ℃ moderately forced convection and above, which is approximately equivalent to TEC cooling. Based on the simulation results, a U-cavity structure Tm: YLF laser pumped by a fiber-coupled semiconductor laser was designed. When using 16 ℃ cooling water to directly cool the crystal fixture, the output power of Tm: YLF with single-crystal double-ended pump and double-crystal four-terminal pump respectively reaches 25.9W and 46W laser output with corresponding ramp efficiencies of 40.7% And 37.1%. During the experiment, the crystal fixture did not appear over-temperature. The experimental results show that the designed direct conduction cooling system can effectively cool the dual crystal four terminal pump structure Tm: YLF crystal with pump power at 140W.