München 2004 – scientific programme
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Q: Quantenoptik und Photonik
Q 49: Ultrakurze Lichtimpulse: Quantenkontrolle (gemeinsame Sitzung mit Fachverband MO)
Q 49.1: Talk
Friday, March 26, 2004, 11:00–11:15, HS 223
Convergence properties of the adaptive compression of high-power, broadband femtosecond laser pulses — •T. Witting1, M. Köller2, G. Tsilimis1, J. Kutzner1, H. Maurer2, and H. Zacharias1 — 1Physikalisches Institut — 2Institut für Numerische und instrumentelle Mathematik, Westfälische Wilhelms-Universität Münster
A feedback controlled pulse shaping device has been implemented and applied for compression of high-power, broadband Ti:Sapphire laser pulses to their transform limit. The laser system consists of a mirror dispersion controlled oscillator and a multipass amplifier with a pairing double prism compressor providing pulses with a duration of 30 fs and an energy of up to 1.2 mJ per pulse at 1 kHz repetition rate. These phase distorted output pulses are phase modulated by an all reflective pulse shaping unit equipped with a high resolution spatial light modulator (SLM) resulting in 22 fs transform limited pulses. To achieve the shortest possible pulse an evolutionary algorithm controls the pulse shaper utilizing a two-photon signal as feedback. Detailed investigations of algorithm parameters and their effect on convergence behaviour have been performed and are comparable with the experimental findings.