Lithium tantalate (LiTaO3) samples were implanted with HI ions at different
energies from 250 to 350 keV using different doses. Lithium triborate (LiB
3O5) Samples were implanted at 350 keV H+ ions with doses from 1 x 10(16) t
o 5 x 10(16) ions/cm(2) in increment of 1 X 10(16) ions/cm(2) at room tempe
rature. The modes in LiTaO3 and LiB3O5 samples were measured by a model 201
0 prism coupler. Two or three modes were observed in most cases. The change
of the refractive index depends on the energy, dose and annealing temperat
ure. Multi-energy implantation was used to broaden the optical barrier. The
re is a threshold dose of around 4 x 10(16) ions/cm(2) for LiB3O5 which is
different from the case of LiTa03. The preliminary results show that the wa
veguide formation in LiTaO3 and LiB3O5 crystals is possible by using keV H ion implantation. (C) 2001 Elsevier Science B.V. All rights reserved.