Abstract

Quasi-phase-matched (QPM) UV second-harmonic generation (SHG) in a periodically poled $\mathrm{MgO}:{\mathrm{LiNbO}}_3$ waveguide is presented. A ridge-type waveguide with high nonlinearity and strong resistance to photorefractive damage was achieved by use of an ultraprecision machining technique. By use of this waveguide in $1.4‐\mathit{\mu }\mathrm{m}$ periodically poled $\mathrm{MgO}:{\mathrm{LiNbO}}_3$, a first-order QPM SHG device for 340-nm UV radiation was demonstrated. In a single-pass configuration, continuous-wave 22.4-mW UV light was generated for a fundamental power of 81 mW, corresponding to a normalized conversion efficiency of 340%/W.

© 2003 Optical Society of America

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