Abstract
Millisecond-pulse laser operation of ions at 78 K is demonstrated in the () crystal under a Tm fiber 1940 nm laser pumping through a energy transfer process for the first time, to the best of our knowledge. The laser slope efficiency was 1% with respect to absorbed pumping energy at 1940 nm. The laser central wavelength shift from 4450 nm at 78 K up to 4510 nm at 110 K was observed. Tunability from 4350 up to 4670 nm at 78 K was achieved using an intracavity tuning element.
© 2019 Optical Society of America
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