Optics Letters ( IF 3.866 ) Pub Date : 2020-01-10 , DOI: 10.1364/ol.384898
Ivan Kuznetsov, Alexey Pestov, Ivan Mukhin, Mikhail Volkov, Maria Zorina, Nikolay Chkhalo, and Oleg Palashov

Composite active elements (AEs) of thin-disk geometry with an anti-amplified-spontaneous-emission (ASE) cap were created for the first time from dissimilar materials (Yb:YAG and sapphire crystals) using the surface-activated direct bonding method based on etching the surfaces with an Ar ion beam and then bringing them into optical contact. Using a sapphire anti-ASE cap allows the thermal lens optical power and the ${{\rm M}^2}$ factor to be reduced significantly compared with the same AE with a YAG anti-ASE cap, and ${{\rm M}^2}$ compared to standard Yb:YAG disks without an anti-ASE cap. Lasing with 320 W average power and ${\sim}{50}\%$ slope efficiency was obtained.

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