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Conference on Lasers and Electro-Optics

Coherent Control of Wavefundtions in 2-D Fourier Transform Optical Spectroscopy

Jongseok Lim, Han-gyeol Lee, Sangkyung Lee, Kanghee Lee, Jaewook Ahn

Published Jan 1, 2010• 1 citation
Publisher

Abstract

We demonstrate the advantage of coherent control technique in 2D Fourier transform optical spectroscopy on atomic model system. By spectrally shaping individual pulses, we selectively turn on and off target couplings.
DOI
10.1364/qels.2010.qfb6

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Selective resonant excitations can be realized with a shaped ultrashort pulse in an optically dense collection of multilevel individual atoms, where the near dipole-dipole interactions induce intrinsic frequency shifts of the atomic resonance. A proper transform-limited pulse and modulation of excitation pulses can be controlled to establish constructive or destructive quantum interference between different excitation pathways towards a desired selective resonant excitation, even driven by pulses with broadband spectral components.
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We show theoretically and experimentally that two-photon coherent control in a VVV-shape three-level system projects a one-photon coherent transient in a simple two-level system. The second- and third-order spectral phase terms of a shaped laser pulse play the roles of time and quadratic spectral phase, respectively, in conventional coherent transients. In a three-pulse coherent control experiment of atomic rubidium, the phase and amplitude of controlled transition probability is retrieved from a two-dimensional Fourier-transform spectral peak. It is hoped that this control scheme may harness coherent control capability on multidimensional Fourier-transform spectroscopy.