Quasi-phase-matched adhered ridge waveguide in LiNbO3

Uniform periodically poled domains were demonstrated in an insulator-sandwiched structure with z-cut lithium niobate wafers for an adhered ridge waveguide. Efficient quasi-phase-matched second harmonic generation was achieved in a mechanically defined ridge waveguide. Strong confinement in the waveguide produced second-harmonic-generation normalized conversion efficiency of 370%/W cm(2) in the 1.5 mu m wavelength region. (c) 2006 American Institute of Physics.