Collection Of theses on high power laser and plasma physics, 2016, 14 (1): 1101002, Published Online: Mar. 22, 2017  

Measurement of Thermal Distortion of the Optical Element in High Repetition Rate Laser with Coherent Modulation Imaging

Author Affiliations
1 中国科学院上海光学精密机械研究所高功率激光物理联合实验室, 上海 201800
2 中国科学院大学, 北京 100049
Abstract
When high-power solid laser working in high repetition rate, the laser output wave-front changes due to the thermal distortion, which is caused by the gain medium under the heat deposition. Therefore, the coherent modulation imaging technology is used to realize the measurement of the laser output wave-front from one frame of diffraction intensity recorded. The phases of thermal distortion of the optical element are obtained when the amplifier working in 1, 5, 7 Hz frequency. Experimental results show that thermal distortion effect is significantly increased, the heat is concentrated toward the center region and the phase change increases as the working frequency increases.

Tao Hua, Liu Cheng, Pan Xingchen, Huang Wenfa, Huang Tingrui, Zhu Jianqiang. Measurement of Thermal Distortion of the Optical Element in High Repetition Rate Laser with Coherent Modulation Imaging[J]. Collection Of theses on high power laser and plasma physics, 2016, 14(1): 1101002.

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