Abstract

Continuous-wave laser action at 2 µm is demonstrated in a TmHo:KYF4 single crystal at room temperature. Crystal growth, spectroscopic measurements, and laser results are presented. An output power in excess of 250 mW is obtained with a tuning range of 99 nm, the largest ever published, to our knowledge, for Tm–Ho in any crystalline host.

© 2004 Optical Society of America

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