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提出了一种用于激光二极管端面抽运固体激光器(DPSSL)中晶体端面直接散热的新方案——在传统的侧壁散热基础上采用金刚石薄片对晶体的抽运面进行散热。使用有限元方法(FEM)分析了该方案的散热效果,并与传统侧壁散热方案的散热效果作了比较,结果表明,使用晶体端面直接散热方案可以将集中于晶体端面的热量更为有效地抽出,大幅度降低晶体抽运端面内的温差,晶体温度最高点出现在晶体内部,降低了晶体抽运端面热损伤概率,显著减弱了晶体热效应;在相同注入功率条件下实验测量了两种散热方式下的输出功率,结果表明,晶体端面直接散热方案可以有效抑制晶体热效应对于输出功率的不良影响,该方案特别适合用于解决大功率端面抽运固体激光器的散热问题。
A new scheme for direct heat dissipation of crystal facets in laser diode end-pumped solid-state lasers (DPSSL) is proposed. The conventional cooling of sidewalls is based on the use of diamond flakes to dissipate the pumping surface of the crystal. Finite element method (FEM) is used to analyze the heat dissipation effect of this solution. Compared with the heat dissipation effect of the traditional side-wall cooling solution, the results show that using the direct cooling solution of the crystal end face can effectively concentrate the heat concentrated on the crystal end face The maximum temperature of the crystal appears inside the crystal, which reduces the probability of thermal damage on the end surface of the crystal, and significantly reduces the thermal effect of the crystal. Two kinds of heat dissipation are experimentally measured under the same injection power The results show that the direct cooling scheme of the crystal end face can effectively restrain the adverse effect of the crystal thermal effect on the output power, and the scheme is particularly suitable for solving the heat dissipation problem of the high power end-pumped solid state laser.