Results for the Nd: YAG thin disk laser are presented. An output power of 65 W is achieved with a two disk laser. Fundamental mode operation is possible at the expense of a reduced efficiency due to the strong and aspherical thermal lens. Using thinner crystals will overcome this problem and a first attempt to preserve the high efficiency is made by increasing the number of pump beam passes. Laser operation at 1.3 µm as well as Q-switch operation with one disk and two disk lasers is also demonstrated.

© 2000 Optical Society of America

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