The formation of planar waveguides in potassium titanyl phosphate by H+ ions implantation at low energy is presented and discussed. The energy and dose were (600+550) keV and (1+0.8)×1016 ions cm−2, respectively. The optogeometrical parameters deduced from the optical characterization are the following: −3% for each refractive index variation (nx, ny, and nz) and a guide thickness of 4.3 μm. A good agreement is found between the value given by the top of the nuclear damages profile obtained by transport of ions in matter code and the value given by the index fall position. Losses measured in nonannealed samples were estimated to be less than 5 dB cm−1.

The Second Harmonic wave generated with Evanescent Wave (SHEW) technique is first applied to measure the value of the non-linear coefficient, d33, of lithium niobate (LN). The result is in good agreement with the known value from the literature. We subsequently investigate the second-order optical properties of the near surface of He+-implanted LN and KTiOPO4 (KTP) crystals. Our results show a rather strong degradation of the non-linearity (≈50%) in both crystals.

LiNbO3, KTiOPO4 (KTP) and Li2B4O7 (LTB) are three materials presenting specific properties for electro-optic, second harmonic generation and acousto-optic integrated applications, respectively. An optical characterization was therefore realized in each of them using the `dark m-lines' spectroscopy. From the angular guided modes spectra are calculated the effective refractive indices which values serve to construct the index profiles by an inverse WKB method. Shifts between index profiles falls were observed. We discuss those particular behaviors and explain them considering three parameters: the model to draw index profile, the experimental measurements and the ionic implantation effects.

Planar optical waveguides have been formed in Z-cut KTP materials by He+ ion implantation, Guided modes's spectra and refractive index profiles n(x), n(xy), n(y) and n(z) are determined from dark m-lines spectroscopy and by using an IWKB method. The coupling efficiency and light confinement are better with TM (n(z)) modes than TE ones. This could be explained by the cristallographic axes orientation with respect to the propagation direction. The anisotropy investigation of the waveguide will end this work.