Abstract
We report on a widely tunable Ho:CYA laser resonantly pumped by a high power Tm:fiber laser at ~1922 nm. A volume Bragg grating is used as a resonator mirror for wavelength selection and spectrum narrowing. A wavelength tuning range of 2055-2100 nm with ~0.1 nm of spectrum line-width has been achieved. Output power of 7.4 W has been obtained at 2095 nm under an incident pump power of 32 W. In free-running mode, over 11.3 W of output power at ~2085 nm has been generated under 40 W of incident pump power, corresponding to a slope efficiency of 30.7%.
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