Compensation of strong thermal lensing in an LD side-pumped high-power Er:YSGG laser
Compensation of strong thermal lensing in an LD side-pumped high-power Er:YSGG laser
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DOI：
10.1088/1612-2011/12/10/105004
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发表时间：
2015-09
影响因子：
1.7
通讯作者：
Jintao Wang;Tingqing Cheng;Li Wang;Jingwei Yang;D. Sun;S. Yin;Xianyou Wu;Hai-he Jiang
中科院分区：
文献类型：
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作者：
Jintao Wang;Tingqing Cheng;Li Wang;Jingwei Yang;D. Sun;S. Yin;Xianyou Wu;Hai-he Jiang
利用激光二极管侧面泵浦激光系统中的谐振腔稳定性条件，测量了Er：YSGG晶体的热焦距，得到了不同平均输入光功率下的热焦距。根据测量的热焦距计算磨削半径，用计算的磨削半径在晶体端面磨削负曲率来补偿强烈的热透镜效应。在重复频率为20 Hz时，平均输出功率为10.1 W，相应的斜率效率为6.5%，光-光效率为5.5%。在20 Hz频率下补偿后，平均输出功率提高了2.58倍。经16赫兹补偿后，最大脉冲能量达到562 mJ。相应的发散角约为θx = 8.13mrad，θy = 约为7.42mrad，能量不稳定性为1.13%。
The thermal focal length of the Er:YSGG crystal was measured using the resonator stability condition in the LD side-pumped laser system, and thermal focal lengths under different average input optical powers were obtained. The grinding radius was calculated according to the measured thermal focal length, and the strong thermal lensing was compensated by grinding negative curvatures on the crystal ends with the calculated grinding radius. The average output power of 10.1 W at a repetition frequency of 20 Hz was achieved, corresponding to the slope efficiency of 6.5% and optical–optical efficiency of 5.5%. The average output power was increased by 2.58 times after compensating at 20 Hz. The maximum pulse energy 562 mJ was achieved after compensating at 16 Hz. The corresponding divergence angles were measured to be about θx = 8.13 mrad, θy = 7.42 mrad, and the energy instability was 1.13%.