An efficient 2 μm room temperature Ho:YVO4 laser resonantly pumped by a 1.94 μm Tm:YAP laser is demonstrated, for the first time to our knowledge, in this Letter. Up to 8.58 W of laser output at 2053 nm is obtained with the optical-to-optical conversion efficiency as much as 41.2%. The output beam had quality of M2 factor with Mx2 of 3.58 and My2 of 1.76 at 8 W output level. In addition, we also obtained 4.18 W laser output at 2066 nm and 7.04 W at 2040 nm from the Ho:YVO4 laser with conversion efficiency of 27.8% and 33.8%, respectively.
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Li et al. (2011) studied this question.
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