Open AccessMeasurement of power spectral density of broad-spectrum visible light with heterodyne near field scattering and its scalability to betatron radiation
Author(s) -
M. Siano,
B. Paroli,
E. Chiadroni,
M. Ferrario,
M. A. C. Potenza
Publication year - 2015
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.23.032888
Subject(s) - betatron , optics , physics , coherence (philosophical gambling strategy) , spectrometer , scattering , grating , electromagnetic spectrum , speckle pattern , spectral density , coherence time , laser , beam (structure) , computer science , telecommunications , quantum mechanics
We exploit the speckle field generated by scattering from a colloidal suspension to access both spatial and temporal coherence properties of broadband radiation. By applying the Wiener-Khinchine theorem to the retrieved temporal coherence function, information about the emission spectrum of the source is obtained in good agreement with the results of a grating spectrometer. Experiments have been performed with visible light. We prove more generally that our approach can be considered as a tool for modeling a variety of cases. Here we discuss how to apply such diagnostics to broad-spectrum betatron radiation produced in the laser-driven wakefield accelerator under development at SPARC LAB facility in Frascati.