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为克服水流冷却在固体激光热管理中结构复杂、稳定性差、能耗大等缺点,设计了热管冷却的Yb:YAG激光放大器。分别通过理论和实验验证了热管冷却技术的可行性。首先,建立了三维、瞬态的有限元模型,模拟结果表明,对于6 kW、1.2 ms的泵浦能量,1 Hz重频下的热管冷却和水流冷却散热能力接近;其次,实验测量了Yb:YAG放大器的输出能量,两种冷却方式在1 Hz下的输出能量基本相同,热管冷却的能量稳定性更好。通过优化热管参数,放大器的工作频率、输出功率得到进一步提高。
In order to overcome the disadvantages of complex structure, poor stability and high energy consumption in the solid laser thermal management of water cooling, a Yb: YAG laser amplifier with heat pipe cooling was designed. The feasibility of heat pipe cooling technology is verified by theory and experiment respectively. First of all, a three-dimensional transient finite element model was established. The simulation results show that the heat pipe cooling and water cooling cooling capacity at 1 Hz repetition rate is close to the pump energy of 6 kW and 1.2 ms. Secondly, the Yb: YAG amplifier output energy, the two cooling methods at 1 Hz under the same output energy, heat pipe cooling energy stability better. By optimizing the heat pipe parameters, the operating frequency of the amplifier, the output power is further improved.