Abstract
Zinc-diffused channel waveguides fabricated in thulium-doped LiNbO 3 have been analyzed by means of confocal micro-luminescence techniques. Modifications induced by Zn 2+ ions in the doped-crystal substrate are characterized following the evolution of the 3H 4→ 3H 6 luminescence of thulium ions at 795 nm, showing the existence of two different regions in the waveguide. Several Raman modes of LiNbO 3 have been used as well to study the differences between the waveguide and the bulk material.
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