Spectral measurement of the film–substrate index difference in proton-exchanged LiNbO₃ waveguides

1998/09/20 by Kacem El Hadi, Vipul Rastogi, M. R. Shenoy +5
Physics and Astronomy · Engineering · #Photorefractive and Nonlinear Optics #Advanced Fiber Laser Technologies #Photonic and Optical Devices

paper · doi:10.1364/ao.37.006463

Abstract

We report the spectral characterization of proton-exchanged lithium niobate (PE:LiNbO(3)) waveguides in terms of the variation of the refractive-index difference between the waveguiding layer and the substrate. The dispersion of the extraordinary refractive-index increase (deltan(e)) is measured from 405 to 1319 nm with several light sources. Two types of proton-exchanged waveguide, prepared under different conditions, are studied. These measurements should be of use in the optimization of PE:LiNbO(3) waveguides for nonlinear optical applications, particularly in second-harmonic generation in the blue-green wavelength region.

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