Wide-Field Interferometric Measurement Of A Nonstationary Complex Coherence Function

Abstract

Spatial coherence function (SCF) is a complex function of two spatial coordinates that, in general, carries more information than the bare intensity distribution. A fast and quantitatively accurate measurement of the SCF is extremely important for a range of applications in optical sensing and imaging. Here, we demonstrate an efficient two-step procedure for measuring the full-field complex coherence function. The measurement relies on an optimized design of a wavefront shearing interferometer capable of characterizing spatially inhomogeneous fields over an extended angular domain. The measurement precision is confirmed by the excellent agreement with a numerical estimation based on Fresnel calculations. We demonstrate that the sensitivity and the measurement range afforded by our instrument permits us to reliably describe the differences in the complex coherence functions that are due to subtle modifications in the shape, position, and orientation of radiation sources.

Publication Date

12-1-2017

Publication Title

Optics Letters

Volume

42

Issue

23

Number of Pages

4929-4932

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1364/OL.42.004929

Socpus ID

85036616966 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85036616966

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