Single frequency Nd:YAG microchip lasers were created by depositing dielectric cavity mirrors directly on a flat slab of Nd:YAG.1 The thickness of the Nd:YAG (730 μm) was chosen so that the cavity mode spacing is comparable to, or greater than, the gain bandwidth of Nd:YAG, and only a single frequency will operate. After the mirrors were deposited, the Nd:YAG was cut into 1- X 2-mm pieces, which were tight-fitted into U-shaped holders adjacent to a piezoelectric transducer, as shown in Fig. 1. The transducer applies a transverse stress to the Nd:YAG, changing the cavity length.

© 1989 Optical Society of America

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