title: Common-path interferometer with diffractive lens.
abstract: We introduce a novel common-path interferometric measurement setup for optical quality testing. The setup is based on an optimized diffractive lens which produces two diffraction orders with equal efficiency and thus forms two interfering beams without any beam splitting or mirror alignments. The fabrication steps of the diffractive element are presented and the testing of the setup with injection molded millimeter scale lenses is briefly discussed.
authors.forename: Henna
authors.initials: H
authors.lastname: Elfström
authors.forename: Anni
authors.initials: A
authors.lastname: Lehmuskero
authors.forename: Toni
authors.initials: T
authors.lastname: Saastamoinen
authors.forename: Markku
authors.initials: M
authors.lastname: Kuittinen
authors.forename: Pasi
authors.initials: P
authors.lastname: Vahimaa