Frankfurt 2006 – wissenschaftliches Programm
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Q: Quantenoptik und Photonik
Q 27: Erzeugung ultrakurzer Lichtimpulse
Q 27.1: Vortrag
Dienstag, 14. März 2006, 13:45–14:00, HIV
Alignment of a multi-grating mosaic compressor in a PW-class CPA-laser — •Marco Hornung, Ragnar Bödefeld, Matthias Schnepp, Joachim Hein und Roland Sauerbrey — IOQ/PAF, Max-Wien-Platz 1, 07743 Jena, Germany
PW-class ultrashort lasers based on chirped-pulse amplification (CPA) imply a temporal stretching of the beam by a factor of 104 or more in order to prevent laser induced damage to the amplifying material. The recompression of such extremely chirped pulses in a Treacy compressor design leads to a grating separation in the range of several meters. A laterally broadened pulse profile in the range of one meter on the second grating surface is the consequence. However, since meter-sized gratings are hardly available, the only alternative for high-power CPA lasers is the use of tiled gratings for the second and third grating pass.
In this talk we investigate the setup of a folded 2-grating compressor with the second grating consisting of two 190x350 mm2 mosaic gratings. We demonstrate the coherent tiling of the gratings by compressing an extremely chirped (2.2 ns) 11 nm FWHM pulse at 1030 nm central wavelength down to the bandwidth limit. Diagnostics used include autocorrelation, SHG-FROG/Grenouille and far-field observation (Fourier Optics).