title: Moiré technique for spatial coherence measurements of soft-x-ray lasers.
abstract: We present a novel moiré diagnostic that allows the time-averaged spatial coherence properties of soft-x-ray lasers to be measured. The technique is an extension of the theoretical work in a recent paper [J. Opt. Soc. Am. A 16, 323 (1999)] and is based on the concept of decompositions of the far-field divergence for partially coherent beams. An appealing feature of the approach is that the spatial coherence width at other planes can be evaluated from the measured one at a given plane on the assumption of shape-invariant beams.
authors.affiliation: National Laboratory on High Power Laser and Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences.
authors.forename: J
authors.initials: J
authors.lastname: Yang
authors.forename: D
authors.initials: D
authors.lastname: Fan
authors.forename: S
authors.initials: S
authors.lastname: Wang
authors.forename: Y
authors.initials: Y
authors.lastname: Gu
mesh_terms: D003198:Computer Simulation; D007834:Lasers; D008962:Models, Theoretical; D015903:Moire Topography; D013997:Time Factors; D014965:X-Rays