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MO: Fachverband Molekülphysik

MO 9: Femtosekundenspektroskopie 3

MO 9.3: Vortrag

Dienstag, 3. März 2009, 17:00–17:15, VMP 6 HS-F

Inherently phase-stable coherent 2D spectroscopy — •Ulrike Selig, Florian Langhojer, Frank Dimler, Tatjana Löhrig, Christoph Schwarz, Björn Gieseking, and Tobias Brixner — Institut für Physikalische Chemie, Universität Würzburg, Am Hubland, 97074 Würzburg

In recent years, coherent two-dimensional spectroscopy was introduced to the optical regime. As a nonlinear technique that determines the third-order response function of a quantum mechanical system, 2D spectroscopy in the visible spectral range has been able to unravel the excitation migration process in photosynthetic light harvesting complexes and coherence transfers in electronically coupled multichromophore systems [1].

We introduce an inherently phase-stable setup for coherent two-dimensional femtosecond spectroscopy in non-collinear box geometry using only conventional beam splitters, mirrors, and delay stages [2] Avoiding diffractive optics, pulse shapers and active phase-locking loops, our spectroscopy setup is simple, robust, and works for ultrabroad bandwidths in all spectral regimes (IR/VIS/UV). First results on a model system, the laser dye Nile Blue in acetonitrile, recorded with roughly twice the bandwidth reported in earlier experiments, will be shown.

[1] M. Cho, Chem. Rev. 108, 1331 (2008)

[2] U. Selig, F. Langhojer, F. Dimler, T. Löhrig, C. Schwarz, B. Gieseking, and T. Brixner, Opt. Lett. 33, 2851-2853 (2008)