Hanbury Brown-Twiss interferometry at a free-electron laser. Physical Review Letters Volume 111, Issue 3, 17 July 2013, Article number 034802

14 сентября 2018
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Контактные данные автора публикации Singer, A.a, Lorenz, U.a, Sorgenfrei, F.bd, Gerasimova, N.a, Gulden, J.ae, Yefanov, O.M.af, Kurta, R.P.a, Shabalin, A.a, Dronyak, R.a, Treusch, R.a, Kocharyan, V.a, Weckert, E.a, Wurth, W.b , Vartanyants, I.A.ac a Deutsches Elektronen-Syn
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Аннотация

We present measurements of second- and higher-order intensity correlation functions (so-called Hanbury Brown - 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 109 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.
Indexed keywords
Gaussian statistics; Hanbury brown-twiss interferometries; Higher order correlation; Intensity correlation; Intensity correlation functions; Non-linear regimes; Spatial and frequency domain; Transverse coherence
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