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Dresden 2011 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 14: Ultrakurze Laserpulse: Erzeugung 1

Q 14.4: Talk

Monday, March 14, 2011, 15:15–15:30, SCH 251

Prepulse suppression in a Multi-10-TW diode-pumped Yb:Glass laser — •Sebastian Keppler1, Ragnar Bödefeld1,2, Marco Hornung1,2, Alexander Sävert1, Joachim Hein1, and Malte Christoph Kaluza1,21Institute of Optics and Quantum Electronics, FSU Jena — 2Helmholtz-Institut Jena

High energy short-pulse laser systems often consist of an oscillator and a certain number of regenerative amplifiers. The repetition rate of such laser systems is some orders of magnitude lower than the repetition rate of the oscillator. Pulse picking systems employing the technique of polarization gating are widely used for this purpose.

Due to the limited extinction ratio of the polarizers and the remaining birefringence of the PC, the polarization contrast of a pulse picker could practically not be increased beyond a certain value. A small part of the pulse train (∼  10−3) will leak into the subsequent regenerative amplifier cavity.

By synchronizing the round trip times, this prepulse could be shifted in time underneath the intensity pedestal of the main pulse. At the time the postpulse arrives at the injection TFP of the second amplifier, the main pulse is also there. Hence, the latter could be hidden in the pedestal of the main pulse.

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