FORMATION AND PROPERTIES OF PROTON-EXCHANGED Z-CUT MGO-LINBO3 CRYSTALWAVE-GUIDES

Proton-exchanged waveguides of Z-cut LiNbO3 (LN) doped with different contents of MgO are fabricated in benzoic acid. The effective refracti ve indexes of the guided modes are measured by prism-coupling method a t different wavelengths of 480 nm, 514.5 nm, 532 nm, 632.8 nm and 1064 nm respectively, and the dispersion of the refractive index increment s of the waveguides is given. The refractive index profiles are obtain ed by IWKB method and the diffusion coefficients are calculated. The r esults show that the waveguides have the step-like profiles and the di ffusion characteristics are influenced by the doping MgO contents in t he LiNbO3 crystal. The diffusion mechanisms are discussed finally.