Abstract
Laser emissions at 2.1 μm from Ho-doped YAG crystals operated at liquid nitrogen temperatures were first reported in 1965.1 Recent materials improvements with Cr and Tm sensitization now allow 2% laser efficiency at room temperature.2 For Cr,Tm,Ho:YAG lasers, reported Q-switched slope efficiencies fall short of long-pulse efficiencies.3–6 In long-pulse mode, the laser output drains the upper laser level Ho 517, while surrounding Tm ions replenish it.
© 1991 Optical Society of America
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