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Journal of Nonlinear Optical Physics & Materials

STIMULATED SCATTERING IN AN OPTICAL LATTICE

S. Guibal, Luca Guidoni, Jerzy Zachorowski, J.-Y. Courtois, Philippe Verkerk, G. Grynberg

Published Oct 1, 1996• 0 citations
Publisher

Abstract

We present a study of pump-probe spectroscopy experiments in an optical lattice. The probe transmission spectrum contains three types of resonances similar to those found in usual nonlinear media: Raman, Brillouin and Rayleigh resonances. We show evidence of the existence of a propagating elementary excitation in the lattice which involves no interaction between the particles and lead to a Brillouin-like scattering. We discuss the central Rayleigh resonance and show that its shape is sensitive to the radiation pressure.

DOI
10.1142/s021886359600060x

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We present a study of pump-probe spectroscopy experiments in an optical lattice. The probe transmission spectrum contains three types of resonances similar to those found in usual nonlinear media: Raman, Brillouin and Rayleigh resonances. We show evidence of the existence of a propagating elementary excitation in the lattice which involves no interaction between the particles and lead to a Brillouin-like scattering. We discuss the central Rayleigh resonance and show that its shape is sensitive to the radiation pressure.
We examine the stimulated light scattering onto the propagation modes of a dissipative optical lattice. We show that two different pump-probe configurations may lead to the excitation, via different mechanisms, of the same mode. We found that in one configuration the scattering on the propagation mode results in a resonance in the probe transmission spectrum while in the other configuration no modification of the scattering spectrum occurs, i.e., the mode is dark. A theoretical explanation of this behavior is provided.
Propagating elementary excitations characterized by a well-defined propagation velocity (such as acoustic waves) are usually considered as being typical of condensed matter or dense fluids. We show that this requirement is actually not necessary. We predict in the case of a dilute optical lattice the occurrence of a propagating excitation mode which can induce a stimulated scattering mechanism analogous to stimulated Brillouin scattering, although it does not involve any interaction between atoms. We also present the results of an experimental investigation in cesium that demonstrates the existence of this novel stimulated scattering process.
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We investigate Rayleigh scattering in dissipative optical lattices. In particular, following recent proposals [S. Guibal, Phys. Rev. Lett. 78, 4709 (1997)]; C. Jurczak, Phys. Rev. Lett. 77, 1727 (1996)]], we study whether the Rayleigh resonance originates from the diffraction on a density grating and is therefore a probe of transport of atoms in optical lattices. It turns out that this is not the case: the Rayleigh line is instead a measure of the cooling rate, while spatial diffusion contributes to the scattering spectrum with a much broader resonance.