Collection Of theses on high power laser and plasma physics, 2006, 4 (1): 171, Published Online: Jun. 4, 2007  

Numerical Simulation of Thermal Induced Effects and Cooling Characteristics of Nd∶GGG Laser Crystal Slabs in the Heat Capacity Operation Mode

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实验室, 上海 201800
2 中国科学院研究生院, 北京 100039
Abstract
Based on the fundamental theory of heat transfer, the mathematical formulas that describing the transient temperature distributions of two-sided laser diode (LD) pumped Nd∶GGG (gadolinium gallium garnet) heat capacity slab laser were derived in this paper. By means of finite element analysis by ANSYS, transient temperature fields and stress distribution in the slab medium were simulated with various boundary conditions, while the beam distortions induced by thermal gradients were analyzed briefly. The obtained results could benefit to the primary designing of solid state heat capacity laser (SSHCL). Numerical analysis proved that under incomplete adiabatic boundary conditions, it would result in temperature gradients perpendicular to the optical axis. About 0.2 μm optical path differences would occur between the edge and optical axis of the slab. In addition, the thermal distributions in the slab during the subsequent cooling stage were mainly studied. The influences of different cooling methods such as air cooling, water cooling and mist cooling were discussed and cooling methods suitable for a SSHCL were briefly studied.

Liqun Hou, Jifeng Zu, Yue Dong, Tao Zhang, Yalong Gu, Xianhua Yin, Zhigang Liu, Jianqiang Zhu. Numerical Simulation of Thermal Induced Effects and Cooling Characteristics of Nd∶GGG Laser Crystal Slabs in the Heat Capacity Operation Mode[J]. Collection Of theses on high power laser and plasma physics, 2006, 4(1): 171.

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