Author: Vartaniants, I.
Paper Title Page
Hanbury Brown and Twiss Interferometry at XFEL Sources  
  • I. Vartaniants
    DESY, Hamburg, Germany
  The invention of optical lasers led to a revolution in the field of optics as well as to the birth of quantum optics. The reasons were the unique statistical and coherence properties of lasers. Short-wavelength free-electron lasers (FELs) are sources of bright, coherent extreme-ultraviolet and X-ray radiation with pulse duration on the order of tens of femtoseconds and are presently considered to be laser sources at these energies. Hanbury Brown and Twiss (HBT) interferometry that is based on intensity correlations allows fast and comprehensive analysis of the FEL statistical properties. We demonstrate that self-amplified spontaneous emission (SASE) FELs are highly spatially coherent to the first-order, but despite their name, statistically behave as chaotic sources. HBT measurements performed at an externally seeded FEL FERMI showed that it behaves as a real laser-like source according to a Glauber definition.  
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