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29 March 2024
 
  » arxiv » 1301.6654

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Hanbury Brown and Twiss interferometry at a free-electron laser
A. Singer ; U. Lorenz ; F. Sorgenfrei ; N. Gerasimova ; J. Gulden ; O. M. Yefanov ; R. P. Kurta ; A. Shabalin ; R. Dronyak ; R. Treusch ; V. Kocharyan ; E. Weckert ; W. Wurth ; I. A. Vartanyants ;
Date 28 Jan 2013
AbstractWe present measurements of second- and higher-order intensity correlation functions (so-called Hanbury Brown and Twiss experiment) performed at the free-electron laser (FEL) FLASH in the non-linear regime of its operation. We demonstrate the high transverse coherence properties of the FEL beam with a degree of transverse coherence of about 80% and degeneracy parameter of the order 10^9 that makes it similar to laser sources. Intensity correlation measurements in spatial and frequency domain gave an estimate of the FEL average pulse duration of 50 fs. Our measurements of the higher-order correlation functions indicate that FEL radiation obeys Gaussian statistics, which is characteristic to chaotic sources.
Source arXiv, 1301.6654
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