Single-crystal Sr2Nb2O7 film optical waveguide deposited by rf sputtering

Abstract
A new optical waveguide of a single‐crystal Sr2Nb2O7filmgrown 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.