Abstract

We demonstrate a high-power $556\mathrm{nm}$ yellow-green laser generated by intracavity frequency doubling of a diode side-pumped Nd:YAG laser at $1112\mathrm{nm}$. A symmetrical L-shaped flat–flat cavity was employed to implement efficient operation of the low-gain $1112\mathrm{nm}$ transition and to achieve good power scalability. The coatings of the cavity mirrors were carefully designed to optimize the performance of the laser, and a $92\mathrm{W}$ continuous wave laser output at $1112\mathrm{nm}$ was achieved when the pumping power of the laser diodes reached $960\mathrm{W}$. By intracavity frequency doubling of the fundamental laser in a lithium triborate crystal, the maximum power of the frequency-doubled output at $556\mathrm{nm}$ was found to be as high as $52.3\mathrm{W}$ with a pulse repetition frequency of $10\mathrm{kHz}$. This corresponds to an optical-to-optical conversion efficiency of about 5.4%.

© 2010 Optical Society of America

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