高功率高效率平面波导激光振荡器实验研究

研究了一种准连续工作下二极管抽运的高功率高效率Nd:YAG平面波导激光振荡器。实验采用尺寸为1 mm×10 mm×60 mm的平面波导作为增益介质, 搭建平平腔实验装置, 研究了平面波导激光器在不同输出镜透射率和不同重复频率下的激光输出特性。实验结果表明, 当输出腔镜透射率为79%时, 在重复频率为500 Hz、工作电流为200 A下, 获得1064 nm激光的平均输出功率为441 W; 在5种不同重复频率下获得最大单脉冲能量为928 mJ, 此时有效光光效率为53.2% 。输出激光脉冲波形与抽运光脉冲波形完全一致, 脉冲宽度都是240 μs。通过系统优化改进, 该激光器输出功率有能力进一步提升。

Abstract

A diode pump high power and high efficiency Nd∶YAG planar waveguide oscillator at quasi-continuous mode is reported. The 1 mm×10 mm×60 mm planer waveguide is selected as gain medium. The plane-plane cavity is built, and the output properties of the planar waveguide laser under different output mirror transmissions and different pulse repetition rates are studied. Experimental results show that when the output coupler transmission is 79%, an average output power of 441 W for the 1064 nm laser is achieved under the pulse repetition rate of 500 Hz and the drive current of 200 A. Under five different repetition rates, the maximum single pulse energy is 928 mJ, and the effective optical to optical efficiency is 53.2%. The pulse waveform of output laser is consistent with that of the pump laser, and both have a pulse width of 240 μs. The output power of the oscillator can be increased after the system optimization.

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