Efficient cw $532\mathrm{nm}$ green-light generation is demonstrated using a periodically poled $\mathrm{MgO}\text{:}{\mathrm{LiNbO}}_3$ ridge waveguide prepared by a process that combines annealed proton exchange and precise dicing. Performance of waveguides with different widths has been investigated. The 6- $\mathit{\mu }\mathrm{m}$ -wide, 1.6-cm-long uncoated ridge waveguide has achieved a green output power of $127\mathrm{mW}$ under a coupled fundamental light power of $250\mathrm{mW}$ . The highest conversion efficiency achieved is 53%.

© 2011 Optical Society of America

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