Abstract
The rare-earth ion Yb 3+ is an efficient sensitizer for Ho 3+ crystal lasers. It has a broad absorption band lying in the emission range of commercially available InGaAs diode lasers and an efficient energy transfer to Ho 3+. We have investigated four Yb 3+:Ho 3+:YAG laser crystals with 16.1 and 30.3 at.% Yb 3+, both with 2 at.% Ho 3+ and two different crystal thicknesses. The pump absorption coefficient α is about 15.1 cm −1 for 16.1 at.% Yb 3+ in YAG at λ=936 nm. Due to the strong absorption, relatively thin crystals with a thickness of 0.5 and 1 mm were used in active mirror configuration. Room temperature cw laser emission has been achieved in all these crystals. The laser thresholds have been measured as a function of the crystal temperature between 0 and 60°C. Thresholds and slope efficiencies of the different crystals are compared. Under diode laser pumping room temperature quasi cw emission up to 370 mW has been achieved in a 15-mm-long resonator for the first time.
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