Modelling phase imperfections in compound refractive lenses. (11th February 2020)

• Record Type: Journal Article
• Authors: Celestre, Rafael; Berujon, Sebastien; Roth, Thomas; Sanchez del Rio, Manuel; Barrett, Raymond
• Is Part Of: Journal of synchrotron radiation. Volume 27:Part 2(2020)
• Page Start: 305
• Page End: 318
• Publication Date: 2020-02-11
• Subjects: compound refractive lenses -- CRLs -- X‐ray optics -- physical optics -- wavefront propagation -- simulation -- SRW; Synchrotron radiation -- Periodicals; Free electron lasers -- Periodicals; 539.73505
• DOI: 10.1107/S1600577519017235
• Languages: English
• ISSNs: 0909-0495

Abstract

Abstract : Coherent and partially coherent accurate wavefront propagation simulations using Synchrotron Radiation Workshop ( SRW ) through thick two‐dimensional Be compound refractive lenses are presented, taking into account the effects of phase errors obtained by X‐ray speckle vectorial tracking at the BM05 Instrumentation Beamline at the ESRF. Abstract : A framework based on physical optics for simulating the effect of imperfect compound refractive lenses (CRLs) upon an X‐ray beam is described, taking into account measured phase errors obtained from at‐wavelength metrology. A CRL stack is modelled, with increasing complexity, as a single thin phase element, then as a more realistic compound element including absorption and thickness effects, and finally adding realistic optical imperfections to the CRL. Coherent and partially coherent simulations using Synchrotron Radiation Workshop ( SRW ) are used to evaluate the different models, the effects of the phase errors and to check the validity of the design equations and suitability of the figures of merit.