F. Lu et al., REFRACTIVE-INDEX PROFILES OF ION-IMPLANTATION WAVE-GUIDES FORMED ON LITHIUM-NIOBATE AND LITHIUM TANTALATE CRYSTALS, JPN J A P 1, 36(7A), 1997, pp. 4323-4325
The planar waveguides are formed by He ion implantation on lithium nio
bate and lithium tantalate crystals. The refractive index profiles in
the waveguides are obtained and fitted. The He ion implantation result
s in the decrease of indices in the barriers both for lithium niobate
and lithium tantalate. In the region of guide, the profiles of the ext
raordinary indices n(e) in two crystals are significantly different. T
he probable reasons are discussed by use of O-16(alpha, alpha)O-16 3.0
45 MeV resonance reaction.