Planar waveguides have been fabricated in Nd- or Ho-doped gallium lanthanum sulfide laser glasses by Ar or N ion implantation. The refractive index profiles were reconstructed based on the results of prism coupling. The Ar implanted waveguides exhibit an approximate steplike distribution, while the N implanted ones show a “well + barrier” type. This difference can be attributed to the much lower dose of Ar ions. After annealing, the N implanted waveguides can support two modes at and have low propagation loss, which makes them candidates for novel waveguide lasers.
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