title: Rotationally invariant Fresnel lens-encoded circular harmonic binary phase-only filters.
abstract: Binary phase-only circular harmonic filters show an angular dependence on the rotational orientation of the input object, which can be removed by encoding a Fresnel lens onto the filter. Theoretical and experimental results are presented using these filters written onto the magnetooptic spatial light modulator.
authors.forename: J A
authors.initials: JA
authors.lastname: Davis
authors.forename: L R
authors.initials: LR
authors.lastname: York
authors.forename: D M
authors.initials: DM
authors.lastname: Cottrell