BIAXIAL BEHAVIOR OF AN OPTICAL WAVE-GUIDE FABRICATED BY ION-IMPLANTATION IN A UNIAXIAL BATIO3 SUBSTRATE

Biaxial behaviour has been observed in a waveguide fabricated by the t echnique of ion-beam implantation(H+ ions: 1 MeV at a rather high dose of 6 X 10(16) ions/cm(2)) in a uniaxial BaTiO3 single crystal. For th e first time to our knowledge this phenomenon has been connected to th e elasto-optic properties of the material. The index profile reconstru ctions both for TE and TM modes are led with two methods and we compar e the results, The computation technique to connect the latter with th e elasto-optic properties is presented, Then the calculations are succ essfully compared with the measured values. (C) 1997 Elsevier Science B.V.