Planar active waveguides were produced in lithium fluoride crystals by implantation with 1.5 MeV He+ ions at several doses. The colored samples have been characterized by optical absorption, photoluminescence and m-line spectroscopy. By comparing the measured guided-mode effective indices with the ones calculated by means of the Chandler–Lama approach, the depth profile of refractive index was derived, showing that there are two competitive physical mechanisms, associated with different processes of energy deposition along the ion track, responsible for positive and negative modifications of the refractive index in the irradiated volume.
1 Apr 2005
Volume: 230 Issue: 1-4 Pages: 257-261
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms