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Novel out-diffusion technique produces refractive-index layers in crystals, revealing low-loss waveguiding.
Positive refractive-index layers in LiNbO3 and LiTaO3 have been produced by a novel out-diffusion technique. The index profiles for a variety of conditions are measured directly with an interference microscope. Low-loss optical waveguiding on the surface of these crystals has been observed.
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Kaminow et al. (1973) studied this question.
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