title: Diffractive simultaneous bidirectional shearing interferometry using tailored spatially coherent light.
abstract: Measurements of wavefront deformations can be carried out with the help of lateral shearing interferometers. Here the focus is on a setup providing two shears along orthogonal directions simultaneously to generate the data needed for a reconstruction. We describe a diffractive solution using Ronchi phase gratings with a suppressed zeroth order for both the doubling of the wavefront under test and the bidirectional shearing unit. A series arrangement of the gratings offers an on-axis geometry, which minimizes the systematic errors of the test. For illumination, an extended incoherent monochromatic light source is used. High-contrast fringes can be obtained by tailoring the degree of coherence via a periodic intensity distribution.
authors.affiliation: Institute for Optics, Information, and Photonics, Friedrich-Alexander University of Erlangen-Nürnberg, Erlangen, Germany. Vanusch.Nercissian@physik.uni‐erlangen.de
authors.forename: Vanusch
authors.initials: V
authors.lastname: Nercissian
authors.forename: Irina
authors.initials: I
authors.lastname: Harder
authors.forename: Klaus
authors.initials: K
authors.lastname: Mantel
authors.forename: Andreas
authors.initials: A
authors.lastname: Berger
authors.forename: Gerd
authors.initials: G
authors.lastname: Leuchs
authors.forename: Norbert
authors.initials: N
authors.lastname: Lindlein
authors.forename: Johannes
authors.initials: J
authors.lastname: Schwider