Düsseldorf 2007 – scientific programme

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MO: Fachverband Molekülphysik

MO 64: Quantum Control II

MO 64.2: Talk

Friday, March 23, 2007, 14:15–14:30, 6F

The effect of multipulse envelope modulation by phase shaping on Pump-Probe spectroscopy — •Tiago Buckup¹, Jürgen Hauer¹, Carles Serrat² und Marcus Motzkus¹ — ¹Physikalische Chemie, Philipps Universität Marburg, D-35032 Marburg, Germany — ²Departament de Fisica, Universitat Politècnica de Catalunya, 08222 Terrassa, Spain

The manipulation of wave packet phenomena plays a significant role in the field of coherent control, with applications reaching from atomic systems to biomolecules. Wave packet control is often achieved with sequences of phase locked pulses, usually generated with sinusoidal modulation in spatial light modulators. In this context, the period of the sinusoidal modulation defines the subpulse spacing and allows the filtering as well as the amplitude enhancement of molecular vibrations. In this work, we discuss the effect of the phase of the sinusoidal modulation on the envelope of the multipulse sequence and its consequences on pump-probe spectroscopy, particularly near zero delay between pump and probe pulses. We show that the multipulse envelope modulation stems from interference between the subpulses and is dependent on the phase of the individual subpulses. The effect is quantified in terms of the spectrum deviation from a Gaussian shape and is simulated numerically for different spectral shapes. Finally, the multipulse envelope modulation is simulated and measured in ultrafast transient absorption and four-wave mixing.