Hannover 2010 – scientific programme

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MO: Fachverband Molekülphysik

MO 24: Poster: Quantum Control

MO 24.3: Poster

Thursday, March 11, 2010, 16:00–18:30, Lichthof

Generation of shaped UV pulses for quantum control spectroscopy — •Jens Möhring¹, Tiago Buckup^1,2, and Marcus Motzkus^1,2 — ¹Physikalische Chemie, Philipps-Universität, D-35043 Marburg, Germany — ²Physikalisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, D-69120 Heidelberg, Germany

The availability of phase and amplitude modulated UV pulses enables the extension of coherent control experiments to new molecular systems absorbing in the UV spectral region. Especially small prototype systems often show only UV absorptions bands and can therefore be studied by quantum control spectroscopy only if shaped UV excitation pulses are available. Here we show an improved setup for generation of phase and amplitude controlled femtosecond UV pulses and their characterization [1]. Central component is a micromechanical (MEMS) mirror 2D phase modulator for ultrashort optical pulse control. A duty cycle upgrade (333 Hz) of the spatial light modulator improves its application in spectroscopic experiments. The application of diffractive 2D shaping removes parasitic amplitude effects of the MEMS shaper and enables on the other hand the introduction of amplitude control on this phase only device. The setup is driven by a two stage noncollinear optical parametric amplifier with sum frequency generation and temporal compression in the UV, yielding a tunable source of 30 fs pulses. Altogether a versatile setup for quantum control spectroscopy in the UV is presented.

[1] Möhring, J. et al., JOSA B 26 (2009) 1538.