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Article Abstract
Tm-doped YLF crystals with different doping concentrations are grown and investigated for their suitability for continuous-wave laser operation on the H→F transition around 1.5 µm. Our spectroscopic investigations reveal the emission, absorption, and gain cross sections as well as the concentration-dependent lifetime of the relevant energy levels. Self-termination of the laser is circumvented in a cascade laser scheme H→F→H for efficient depopulation of the long-living lower laser level F. In this way, simultaneous laser operation at 1509 nm and 1923 nm with slope efficiencies of 44% and 35% and pump-power-limited output powers of 590 mW and 670 mW are obtained under 781-nm Ti:sapphire laser pumping, respectively.
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