High-Efficiency High Repetition Rate Gain-Switched Lasers at 2.4-2.7 μm Based on Polycrystalline Cr2+:ZnSe Slabs with Undoped End-Cups Pumped at 2.1 μm by Ho3+:YAG Lasers

摘要

Efficient gain-switched laser operation at 2.4–2.7 μm was achieved in polycrystalline Cr^{2+:ZnSe slabs (with rectangular or zig-zag optical path configurations) pumped at 2.1 μm by the pulsed Ho3+:YAG laser with the repetition rate of 5–30 kHz. The lasing occurred at 2.4–2.6 μm or 2.65–2.7μm, depending on the cavity mirror reflections, temperature, and resonator design. The average oscillation power reached 2.7 W (at 2.65–2.7 μm) with a slope efficiency of ~40%,or 3.4 W(at 2.4–m2.6 μm) with a slope efficiency of ~50%AA.}