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Structure of high index proton exchange LiNbO3 waveguides with undegraded nonlinear optical coefficients

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3 Author(s)
Rams, J. ; Departamento de Fisica de Materiales C-IV, Universidad Autónoma de Madrid, Canto Blanco, E-28049 Madrid, Spain ; Agullo-Rueda, F. ; Cabrera, J.M.

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A structural study is presented on proton exchanged LiNbO3 waveguides prepared in benzoic acid vapor which, for z-cut substrates, were previously reported to simultaneously exhibit high index jump, very low losses, and undegraded nonlinear optical coefficients. X-ray rocking curves of z-cut guides show a unique, intense peak with the same bandwidth as the substrate peak, located at the κ2-phase position of HxLi1-xNbO3, as well as a small α-phase contribution. For x-cut guides only the β1-phase peak is obtained, with a bandwidth about 60% greater than the substrate peak. Distinctive features of κ2 and β1 guides are also shown in micro-Raman spectra. © 1997 American Institute of Physics.

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Applied Physics Letters  (Volume:71 ,  Issue: 23 )