End-pumping ZnWO_4:Tm~(3+) at ～1.9μm eye-safe laser

摘要

The ZnWO_4:Tm~(3+) single crystal has been grown by Czochralski method and the concentration of Tm~(3+) is 0.2 at.%. End-wing -pumping ZnWO_4:Tm~(3+) crystal by 795 nm LD, we obtain a novel～1.9 μm eye-safe laser. At different temperatures, the laser output versus pump power is measured. At 283 K, the highest output power is up to 240 mW and the slope efficiency is 1.7%. By means of the quasi-three energy level theory, we investigate the optimized crystal length. Results indicate that the slice laser system is more suitable for the end pumping ZnWO_4:Tm~(3+) crystal.