Permanent optical strip waveguides in single crystals of KNbO3 were produced with MeV He ion implantation. Guided TE00 modes were observed and the propagation losses were characterized at the wavelengths of 514, 632, and 860 nm. Waveguide propagation losses of 1.4 dB/cm were measured at 632 nm.
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Fluck et al. (1991) studied this question.
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