Abstract
We report a large mode volume unstable resonator working at . The resonator is combined with a variable reflectivity convex mirror and a high-reflective convex mirror. The cavity mirrors are used to compensate for the thermal lensing effect of the two Nd:YAG laser rods, which are pumped by high- energy high-repetition-rate diode lasers. A quartz rotator is placed between the two laser rods to compensate for the thermal depolarization. In the experiment, output of as high as is obtained at with slope efficiency of 36%. The pulse width is , and the beam quality factor is , .
© 2011 Optical Society of America
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