23 May 2013 Highly efficient resonantly pumped Er:YAG large area waveguide laser with diffraction limited output
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Abstract
We demonstrated nearly a quantum defect limited CW operation of a 41-mm-long Er:YAG large area crystalline waveguide laser with a diffraction limited output, which was resonantly pumped by a fiber laser at 1532 nm. Using a Er(0.25%):YAG, 62 μm x 62 μm waveguide, surrounded by a 3 x 5 mm rectangular cladding of undoped YAG, an output power of 9.1 W with slope efficiency of 92.8% has been achieved. The output laser beam had a Gaussian profile with a ~ 2.8 x 10-2 rad divergence, which is in good agreement with the divergence expected from a waveguide with a low NA value. The waveguide laser operated simultaneously at two wavelengths, 1617 nm and 1645 nm, when the transmission of the laser cavity output coupler was less than 20-25%, and operated only at 1617 nm when the laser output mirror had a higher transmission.
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N. Ter-Gabrielyan, N. Ter-Gabrielyan, V. Fromzel, V. Fromzel, Mark Dubinskii, Mark Dubinskii, X. Mu, X. Mu, H. Meissner, H. Meissner, } "Highly efficient resonantly pumped Er:YAG large area waveguide laser with diffraction limited output", Proc. SPIE 8733, Laser Technology for Defense and Security IX, 87330L (23 May 2013); doi: 10.1117/12.1518452; https://doi.org/10.1117/12.1518452
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