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K: Kurzzeitphysik

K 11: Poster

K 11.5: Poster

Mittwoch, 29. März 2006, 17:45–19:00, Flure

19-fs shaped UV-pulses by chirped sum frequency mixing — •Christian Schriever, Stefan Lochbrunner, Michael Opitz und Eberhard Riedle — LS für BioMolekulare Optik, Ludwig-Maximilians-Universität München

Light pulses with precisely controlled spectral and temporal characteristics can selectively address and manipulate the dynamics of complex quantum mechanical systems. To deal with molecular dynamics, shaped excitation pulses with substructures on the time scale of vibrations are needed. The pulses must be in the UV where most organic compounds have their first electronic transition. Since established techniques like liquid crystal spatial light modulators and acoustooptic modulators are not suitable for the UV, we developed a method based on sum frequency mixing of shaped visible pulses with deliberately chirped NIR pulses for a tuning range from 295 nm to 370 nm. The spectral phase and amplitude of the shaped visible pulses is directly transfered to the UV. The attainable pulse complexity is only restricted by the spectral resolution of the shaper. By mixing NIR pulses chirped to a duration of 1.2 ps with visible pulses already pre-compensated for the dispersion along the UV path we generated for the first time complex pulses at 344 nm with substructures as short as 19 fs. We demonstrate double and triple pulses with pulse separations up to 500 fs.