Abstract

300W continuous-wave operation of a diode edge-pumped, hybrid (single-crystal/ceramic) composite, Yb3+:YAG microchip laser with a 5mm diameter and 300μm thickness single-crystal core uniformly bonded to a water-cooled heat sink by a new Au–Sn soldering system has been demonstrated. The beam quality factor M2 follows the mode mismatch between the core and the fundamental mode and was improved to 17 with a maximum output power of 230W. A thermally induced convex mirror with a spherical radius of curvature ranging from 2.5 to 1.5m was observed; the radius of curvature decreases through thermal deformation of the microchip as the pump power increases.

© 2006 Optical Society of America

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