Frankfurt 2006 – scientific programme

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MO: Molekülphysik

MO 51: Molecular Quantum Control

MO 51.7: Talk

Thursday, March 16, 2006, 12:10–12:25, H12

Coherent Control with Actively Shaped Supercontinuum from a Photonic Crystal Fiber — •B. von Vacano, W. Wohlleben, and M. Motzkus — Phys. Chem., Philipps-Universität, 35032 Marburg

Coherent control aims at selectively manipulating quantum states through the interaction with laser light. To do this, broadband excitation sources are highly attractive, as ultrashort pulses offer many possible interfering quantum paths. It would be very desirable to extend the applicability of standard 100 fs - Ti:Sa-oscillators towards broadband excitation. This can be achieved by nonlinear broadening of the laser spectrum in a microstructured fibre into supercontinuum and subsequent compression.

We successfully employed the combination of broadband pulses from a photonic crystal fibre (PCF) and pulse shaping for coherently controlled nonlinear spectroscopy [1]. The pulse shaper not only manages to compress the PCF supercontinuum to 18 fs pulses but also to additionally manipulate the phase for quantum control experiments. This approach is demonstrated by single-beam coherent anti-Stokes Raman (CARS) microspectroscopy [2,3] and is due to its simplicity well suited for general applications in coherently controlled spectroscopy and microscopy.

[1] B. von Vacano, W. Wohlleben, M. Motzkus. Optics Letters, in press.

[2] N. Dudovich, D. Oron, Y. Silberberg. Journal of Chemical Physics 118 (20), 9208 (2003).

[3] B. von Vacano, W. Wohlleben, M. Motzkus. Journal of Raman Spectroscopy, in press.