title: In-band pumped highly efficient Ho:YAG ceramic laser with 21 W output power at 2097 nm.
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 ~1907 nm. 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 21.4 W of cw output power at 2097 nm has been generated with the 1.5 at.% doped Ho:YAG ceramic under 35 W 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%.
authors.affiliation: Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education), Department of Optical Science and Engineering, Fudan University, Shanghai 200433, China.
authors.forename: Hao
authors.initials: H
authors.lastname: Chen
authors.forename: Deyuan
authors.initials: D
authors.lastname: Shen
authors.forename: Jian
authors.initials: J
authors.lastname: Zhang
authors.forename: Hao
authors.initials: H
authors.lastname: Yang
authors.forename: Dingyuan
authors.initials: D
authors.lastname: Tang
authors.forename: Ting
authors.initials: T
authors.lastname: Zhao
authors.forename: Xiaofang
authors.initials: X
authors.lastname: Yang