Continuous-wave 90-W output power is reported from 400-?m thick Yb:YAG/YAG composite structure with 10-at.% Yb:YAG core of 2?-mm<sup>2</sup> area. The slope efficiency and optical-to-optical efficiency with respect to the pump power were 40% and 28%, respectively. Optical phase distortions measurement gives focus shift bellow 0.05 m and shows the absence of astigmatism. Gold-Tin and Indium soldering techniques for bonding the laser crystal to the microchannel cooling system were evaluated.

© 2004 Optical Society of America

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