Abstract
Efficient monolithic 1.9μm micro-laser was realized in a 1.1-mm-thick, 6.4at.% Tm3+:BaGd2(MoO4)4 unprocessed cleaved plate coated with the cavity mirrors directly. End-pumped by a fiber-coupled 795nm diode laser, continuous-wave output power of 250mW was obtained when incident pump power was 1.15W. Slope efficiencies with respect to incident and absorbed pump power were 36% and 61%, respectively. End-pumped by a single-stripe 805nm diode laser, which is more favorable for constructing a compact and inexpensive 1.9μm all-solid-state laser, continuous-wave output power of 100mW was obtained when incident pump power was 2.0W. Slope efficiencies with respect to incident and absorbed pump power were 11% and 23%, respectively. The spectra and spatial profiles of the monolithic Tm3+:BGM micro-laser were also measured and analyzed.
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