Abstract

We report the fabrication of a $12‐\mu \mathrm{m}$-thick periodically poled ${\mathrm{LiNbO}}_3$ planar waveguide buried in ${\mathrm{LiTaO}}_3$ by direct bonding of precision-polished surfaces. Frequency doubling of the 1064-nm output of a cw diode-pumped Nd:YAG laser was performed in a 5.5-mm-long device with a $6.50‐\mu \mathrm{m}$-period grating at an elevated temperature of 174 °C. The resultant green second-harmonic output exhibited fundamental-spatial-mode characteristics at a $4.3\%{\mathrm{W}}^{-1}$ conversion efficiency.

© 1999 Optical Society of America

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