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增益介质的热效应是制约掠入射板条激光器获得高功率和高光束质量的重要因素。采用Nd…YAG和蓝宝石晶体键合的方法,研究掠入射板条激光器增益介质的热效应。理论模拟了Nd…YAG与蓝宝石键合晶体增益介质的温度场分布和热焦距。实验对比了Nd…YAG和蓝宝石键合晶体与单块Nd…YAG晶体增益介质的输出特性:在相同腔长和抽运的自由振荡条件下,键合晶体的最大稳定输出功率比单块Nd…YAG晶体提高了26%;当抽运功率为44W时,键合晶体相对于单块Nd…YAG晶体热焦距增长了69%;同时,键合晶体宽度、厚度方向的光束质量因子M_x~2=1.84、M_y~2=2.29,单块Nd…YAG晶体宽度、厚度方向的光束质量因子M_x~2=2.92、M_y~2=4.38。理论分析和实验结果表明,Nd…YAG和蓝宝石键合晶体能够降低掠入射板条激光器增益介质的热效应,有利于输出功率和光束质量的提高。
The thermal effect of the gain medium is an important factor that limits the high power and high beam quality of a grazing incidence slab laser. The thermal effect of the gain medium in a grazing incidence slab laser is studied by using a combination of Nd: YAG and sapphire crystals. The temperature distribution and thermal focal length of the Nd: YAG and sapphire bonded crystal gain medium are simulated theoretically. The output characteristics of the Nd: YAG and sapphire bonded monolithic Nd: YAG crystal gain medium are compared experimentally: the maximum stable output power of the bonded crystal under the same cavity length and pumping free oscillation The YAG crystal is increased by 26%; when the pumping power is 44W, the thermal focal length of the bonded crystal is increased by 69% with respect to that of the single Nd: YAG crystal; meanwhile, the beam quality factor M_x ~ 2 = 1.84, and M_y ~ 2 = 2.29. The beam quality factors M_x ~ 2 = 2.92 and M_y ~ 2 = 4.38 in the width and thickness direction of monolithic Nd ... YAG crystal. Theoretical analysis and experimental results show that the Nd: YAG and sapphire bonded crystals can reduce the thermal effect of the grazing incidence slab laser gain medium, which is beneficial to the improvement of output power and beam quality.