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采用1.06μm调Q激光脉冲抽运Cr4+:YAG晶体,实现Cr4+:YAG激光器的增益开关运转。当输出镜透过率为3%,抽运能量为85mJ时,发射中心波长为1.44μm的激光脉冲,脉冲宽度和能量分别为12ns和2.84mJ,光-光转换效率为3.3%。实验上比较了采用不同透过率的输出镜时,Cr4+:YAG激光器的输出能量和转换效率与抽运能量的关系,以及不同抽运能量下的1.44μm激光脉冲的宽度和建立时间。结果表明,随着抽运能量的增加,脉冲宽度和建立时间减小;转换效率在较大抽运能量时下降;对此进行了合理的理论分析。
The Cr4 +: YAG crystal was pumped by a 1.06μm Q-switched laser pulse to realize the gain switching operation of Cr4 +: YAG laser. When the output of the output mirror is 3% and the pumping energy is 85mJ, a laser pulse with a center wavelength of 1.44μm is emitted. The pulse width and energy are 12ns and 2.84mJ respectively, and the light-to-light conversion efficiency is 3.3%. The output power and conversion efficiency of Cr4 +: YAG laser and the pumping energy were compared experimentally with the output mirror of different transmittance, and the width and settling time of 1.44μm laser pulse with different pumping energy were compared. The results show that with the increase of pumping energy, the pulse width and settling time decrease; the conversion efficiency decreases with larger pumping energy; and a reasonable theoretical analysis is made.