We designed a planar-waveguide quasi-phase-matched second-harmonic-generation device, which consists of a Y-cut periodically poled $5\mathrm{mol.}\%$ $\mathrm{MgO}$ -doped ${\mathrm{LiNbO}}_3$ core and ${\mathrm{SiO}}_2$ claddings, that provided a $1.08\mathrm{W}$ green light with 30% conversion efficiency by using a $7\mathrm{mm}\mathrm{long}$ sample at room temperature. The highest conversion efficiency of 49% at $0.88\mathrm{W}$ second-harmonic generation was attained by using an $18\mathrm{mm}$ long device.

© 2006 Optical Society of America

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