Abstract
Using excitation via an upconversion process to populate the upper laser level, laser emission at 1.73 μm from the 4S3/2 → 4I9/2 transition has been observed in 4% and 8% Er:LiYF4 (Er:YLF) at room temperature. Laser emission at 1.68 μm from the erbium 4I9/2 → 4I13/2 transition was also observed in both samples.
© 1987 Optical Society of America
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