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We demonstrated compact intracavity-pumped Ho: YAG slab lasers utilizing diode-pumped a-cut and b-cut Tm: YAP slab lasers at room temperature, respectively. In the Tm laser experiment, we conducted detailed investigations on both the acut and b-cut Tm: YAP lasers, achieving maximum output powers of 8.5 W at 1.99 μm and 9.2 W at 1.94 μm under the incident LD power of 31.8 W, respectively. In the intracavity-pumped Ho configuration, a-cut Tm: YAP laser pumped Ho: YAG laser obtained a maximum output power of 3.2 W at 2.12 μm with a slope efficiency of 16.9%. This is slightly lower compared to the b-cut Tm: YAP laser pumped Ho: YAG laser, which reached a maximum output power of 3.4 W at 2.12 μm with a slope efficiency of 20.8% in the same cavity. To our knowledge, this represents the highest output power of Tm: YAP intracavity-pumped Ho: YAG laser. Additionally, the beam quality factors M2 of the Ho: YAG laser were estimated to be better than 1.2 in both the horizontal and vertical directions. This indicates the appearance of near-diffraction-limited beam quality.
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