We present measurements of the second order spatial coherence function of thermal light sources using Hanbury-Brown and Twiss interferometry with a digital correlator. We demonstrate that intensity fluctuations between orthogonal polarizations, or at detector separations greater than the spatial coherence length of the source, are uncorrelated but can be used to reduce systematic noise. The work performed here can readily be applied to existing and future Imaging Air-Cherenkov Telescopes used as star light collectors for Stellar Intensity Interferometry (SII) to measure spatial properties of astronomical objects.
@article{arxiv.1708.05708,
title = {Development of a Digital Astronomical Intensity Interferometer: laboratory tests with thermal light},
author = {Nolan Matthews and David Kieda and Stephan LeBohec},
journal= {arXiv preprint arXiv:1708.05708},
year = {2017}
}
Comments
13 pages, 5 figures, Accepted into special issue of the Journal of Modern Optics