Abstract

We report what we believe is the first cw quasi-phase-matched intracavity frequency doubling of a diode-pumped 946-nm Nd:YAG laser by use of bulk periodically poled MgO–LiNbO3. A maximum second-harmonic power of 5.9  mW was obtained at a laser diode power of 500  mW. The blue beam profile showed a TEM00 single spatial mode of low ellipticity (1:1) because there was no walk-off problem. Bulk periodic domain inversion was accomplished by a corona discharge method with a first-order modulation period of 4.75  µm for a wavelength of 946  nm over a 2-mm interaction length in Z-cut 0.4-mm-thick MgO–LiNbO3.

© 1997 Optical Society of America

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