Spectroscopic characterization of vacuum ultraviolet free electron laser pulses

Because of the stochastic nature of self-amplified spontaneous emission (SASE), it is crucial to measure for single pulses the spectral characteristics of ultrashort pulses from the vacuum ultraviolet free electron laser (FLASH) at DESY, Germany. To meet this particular challenge, we have employed b...

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Bibliographic Details
Published in:Optics letters 2006-06, Vol.31 (11), p.1750-1752
Main Authors: DÜSTERER, S, RADCLIFFE, P, POLETTO, L, YEATES, P, LUNA, H, COSTELLO, J. T, ORR, P, CUBAYNES, D, MEYER, M, GELONI, G, JASTROW, U, KUHLMANN, M, PLÖNJES, E, TIEDTKE, K, TREUSCH, R, FELDHAUS, J, NICOLOSI, P
Format: Article
Language:English
Subjects:
Electromagnetism
electron and ion optics
Exact sciences and technology
Free-electron lasers
Fundamental areas of phenomenology (including applications)
Physics
Radiation by moving charges
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Summary:Because of the stochastic nature of self-amplified spontaneous emission (SASE), it is crucial to measure for single pulses the spectral characteristics of ultrashort pulses from the vacuum ultraviolet free electron laser (FLASH) at DESY, Germany. To meet this particular challenge, we have employed both photon and photoelectron spectroscopy. Each FEL pulse is composed of an intense and spectrally complex fundamental, centered at a photon energy of about 38.5 eV, with a bandwidth of 0.5% accompanied by higher harmonics, each carrying an intensity of typically 0.3 to 0.6% of that of the fundamental. The correlation between the harmonics and the fundamental is in remarkable agreement with a simple statistical model of SASE FEL radiation.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.31.001750