Dresden 2011 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 15: Poster 1: Quanteninformation, Quanteneffekte, Laserentwicklung, Laseranwendungen, Ultrakurze Pulse, Photonik
Q 15.53: Poster
Monday, March 14, 2011, 16:30–19:30, P1
Thomson backscattering on laser-accelerated relativistic electron sheets — •Stephan Kuschel1,2, Christian Rödel1,2, Athena Paz1,2, Oliver Jäckel1,2, Malte Kaluza1,2, and Gerhard Paulus1,2 — 1Institut für Optik und Quantenelektronik, Friedrich-Schiller-Universität Jena — 2Helmholtz-Institut Jena
High-intensity femtosecond laser pulses open the way to ultra-short particle sources with relativistic energies. When a short laser pulse interacts with a counter-propagating electron bunch, the Thomson backscattering frequency is Doppler upshifted by 4γ2 times the laser frequency. Since both the electron bunch and the optical pulse have a duration in the femtosecond domain, the scattered radiation is a promising ultra-short XUV source. An all-optical compact particle and photon source was set up for this purpose using a 30-fs 40-TW laser. An electron bunch with MeV electron temperature was created by focusing the TW pulses on a thin metal foil after enhancing the pulse contrast by means of a plasma mirror. A temporally delayed probe pulse was focused on the counter-propagating electron bunch. The XUV emission recorded with an XUV spectrometer showed a clear dependence on the delay. The yield of the XUV radiation and its spectral shape are in agreement with theoretical predictions. The XUV signal which is attributed to Thomson backscattering gives rise to an electron temperature of about 1-3 MeV which is consistent with former experimental findings and theoretical predictions.