Thermal effect severely limits the output power and beam quality in high-power solid-state lasers systems. In solid-statelasers, most optical elements are cylindrical, such as laser medium, mirrors, and so on. Normally, thermal analysis isdeduced based on the hypothesis that just one surface is cooled while the others are adiabatic. This paper presentssemi-analytical formula of steady-state temperature field distribution, based on the hypothesis that both side surface andone end surface are cooled with different coefficients of heat transfer. Simulation results with Ansys confirmed thecorrectness of the above formula. The results are helpful to the study of thermal effect in disc laser, rod laser andreflective mirrors in high-power laser system.
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