In this paper, the finite element analysis method is used to simulate the heat dissipation effect of the water-cooling channel in a conical mirror when high power laser (104 W level) is irradiated on it. Several important factors affecting the heat dissipate, such as the inlet flow velocity, loaded laser power and the mirror material, are analyzed systematically. The temperature distribution of the conical mirror with the parameters’ variation is obtained, and the relationship between the above parameters and the temperature results are discussed. Finally, based on the thermal analysis of the water-cooling channel structure of the conical mirror under high power laser, we can find that the water-cooling channel structure can greatly improve the cooling capacity and effectively achieve heat dissipation of the conical mirror.
At present, the finite element method is often used to analyze the thermal effect of laser medium in solid-state lasers. By calculating the temperature field distribution, further research on thermal lens, thermally induced depolarization and other thermal effects can be carried out. In the thermal analysis model of laser medium based on heat conduction equation, the definition and selection of characteristic parameters have an important influence on the calculation results. Due to the difference and diversity in the definition and selection of characteristic parameters, this paper focuses on the definition of heat source in the model, gives the expression of heat source under different spatial distribution of pump light, analyzes definition of conversion coefficient of pump energy into heat deposition in crystal, and limits the range in boundary conditions. Taking the thin disk laser medium as an example, the influence of the model parameters on the calculation results is analyzed and the accuracy of the model is verified compared with the test results.
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