Berlin 2005 – scientific programme

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SYLP: Relativistische Laser-Plasma-Physik

SYLP 3: Poster zum Symposium Relativistische Laser-Plasma-Physik

SYLP 3.8: Poster

Saturday, March 5, 2005, 10:00–17:00, HU Senatssaal

Time resolved observation of THz emission by laser-accelerated electrons in a gas jet — •Stefan Karsch¹, Steven Jamison², Kay-Uwe Amthor³, Jordan Gallacher², Ben Liesfeld³, Christopher Murphy⁴, Bernhard Hidding⁵, Laszlo Veisz¹, Ferenc Krausz¹, Roland Sauerbrey³ und Heinrich Schwoerer³ — ¹Max-Planck-Institut für Quantenoptik, Garching — ²University of Strathclyde, Glasgow — ³Friedrich-Schiller-Universität Jena — ⁴Rutherford-Appleton Laboratory, Didcot — ⁵Heinrich-Heine-Universität Düsseldorf

A time-resolved measurement of the THz radiation emitted from a laser-driven electron bunch crossing the plasma-vacuum boundary of a gas jet was performed. We re-imaged the THz radiation from the gas jet into a ZnTe crystal, which exhibits a large Pockels effect. The time-dependent polarisation caused by the THz fields in the crystal rotates the polarisation state of a stretched, chirped probe laser pulse passing simultaneously through the same crystal, acting as a fast optical shutter. The probe pulse is subsequently analysed in a spectrometer or a cross-correlated with a second, short probe pulse to reconstruct the time structure of the THz pulse. We will discuss the results obtained from both methods and discuss mechanisms for the THz generation. This will also give allow to put an upper limit for the duration of the electron bunch.