We evaluate the thermal effects of a c-cut Tm:YAP slab laser by considering the anisotropic properties of the biaxial YAP crystal. Significant improvements in thermal stress were demonstrated by selecting the crystallographic a-axis, which possesses higher thermal conductivity and thermal expansion, as the direction of the slab thickness. A maximum laser power of 30 W (E//a) at 2 µm was obtained under an incident LD power of 55 W with an optical conversion efficiency of 55.4% and slope efficiency of 61.8% using the a-slab. The slab laser was then used for realizing compact Ho lasers via intra-cavity pumping, resulting in a 0.8 W Ho:YAG laser and a 5.5 W Ho:YAP laser (E//b) at 2.12 µm and 2.13 µm, respectively.

中文翻译：

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高效Tm：YAP平板激光器及其Ho激光器腔内泵浦的各向异性热分析。

我们通过考虑双轴YAP晶体的各向异性来评估c切割Tm：YAP平板激光器的热效应。通过选择具有较高导热性和热膨胀性的结晶a轴作为板坯厚度方向，可以证明热应力的显着改善。使用a平板，在55 W的入射LD功率下，在2 µm处获得的最大激光功率为30 W（E // a），光转换效率为55.4％，斜率效率为61.8％。然后使用平板激光器通过腔内泵浦实现紧凑型Ho激光器，分别产生2.12 µm和2.13 µm的0.8 W Ho：YAG激光器和5.5 W Ho：YAP激光器（E // b）。