Abstract

We report on the high-power and high-efficiency operation of a polycrystalline Ho:YAG ceramic laser in-band pumped by a Tm fiber laser at 1907nm. Lasing characteristics of a 1.5  at.% and a 2.0  at.% Ho3+-doped YAG ceramic were investigated and compared. Using an output coupler of 6% transmission, over 21.4W of cw output power at 2097nm has been generated with the 1.5  at.% doped Ho:YAG ceramic under 35W of incident pump power, corresponding to an average slope efficiency with respect to the incident pump power of 63.6% and an optical-to-optical conversion efficiency of 61.1%.

© 2011 Optical Society of America

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