Regensburg 2010 – scientific programme

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MA: Fachverband Magnetismus

MA 33: Poster II

MA 33.82: Poster

Friday, March 26, 2010, 11:00–14:00, Poster B1

Construction of a SHG-FROG to characterize a laser amplifier system for higher harmonic generation (HHG) — •Nadine Keul, Patrik Grychtol, Roman Adam, and Claus M. Schneider — Institute of Solid State Research, IFF-9 "Electronic Properties", Research Center Juelich, D-52425 Juelich

Latest developments in nonlinear light sources are opening the door for employing ultra-short soft X-ray pulses in a laboratory environment and thus offering a compact tool for element-selective investigation of magnetic properties on a nanometer and femtosecond scale. To this end, ultrashort (< 35 fs) laser pulses with peak-pulse energies exceeding 1 mJ are focused into a localized inert gas plasma generating higher harmonics (HHG) of the fundamental laser frequency. By this means ultrashort (< 1 fs) coherent soft X-ray pulses with energies of up to 100 eV can be generated with moderate effort. The conversion efficiency depends on the special character (length, dispersion, amplitude, etc.) of the driving laser pulse. To characterize the pulse parameters of the amplifier system we assembled a SHG-FROG (Second Harmonic Generation - Frequency Resolved Optical Gating) set-up and investigated the HHG conversion efficiency depending on the shape of the laser pulse employing a X-ray CCD camera.