title: High-efficiency single-order waveguide grating coupler.
abstract: High-efficiency single-order grating coupling between an optical waveguided mode and a volume wave is achieved by means of a double-sided corrugated cover film that has phase-shifted undulations. A greater than 90% outcoupling ratio into air is demonstrated for weakly guiding ion-exchanged waveguides. The conditions for efficient coupling and the tolerances on them are established.
authors.affiliation: Institute of General Physics, Academy of Sciences of the USSR, 117942 Moscow, USSR.
authors.forename: I A
authors.initials: IA
authors.lastname: Avrutsky
authors.forename: A S
authors.initials: AS
authors.lastname: Svakhin
authors.forename: V A
authors.initials: VA
authors.lastname: Sychugov
authors.forename: O
authors.initials: O
authors.lastname: Parriaux