A new optical waveguide of a single-crystal Sr2Nb2O7 film grown onto a b-plate Sr2Ta2O7 substrate by rf sputtering is reported. Waveguide propagation loss was 7.6 dB/cm for the TE0 mode at 6328 Å. An increased oxygen concentration in the sputtering gas is effective in lowering the optical waveguide propagation loss.
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Ishitani et al. (1976) studied this question.
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