NDLI: Temperature variation of ultraslow light in a cold gas

Content Provider	IEEE Xplore Digital Library
Author	Morigi, G. Agarwal, G.S.
Copyright Year	2000
Description	Author affiliation: Max-Planck-Inst. fur Quantenopt., Garching bei Munchen, Germany (Morigi, G.)
Abstract	Summary form only given. In the context of Bose-Einstein condensation in atomic gases, the scattering of light from a cold gas is an open front of investigation, both on the theoretical and experimental side. As much as it regards the propagation of radiation inside a cold gas, it is well known that the transmission of resonant light is almost zero. However, electromagnetic induced transparency has been proved to allow the propagation of a light pulse by means of quantum coherence between different internal atomic levels. In this context L.V. Hau et al. (1999) discovered a remarkable property of pulse propagation in a Bose condensate. These authors demonstrated the slowing down of the group velocity of the pulse to 17 m/sec and shown a definite dependence of the group velocity on the temperature of the cold sample. We develop a model based on approximate but plausible arguments to explain these observations. We solve the Maxwell-Bloch equations for a gas of non-interacting bosons initially in thermal equilibrium and derive an analytic expression for the group velocity of light in a cold gas for two cases: atoms confined in a box and by a harmonic potential. We obtain results which reproduce those of Hau et al. for temperatures above the critical value. In particular, the treatment brings out the factors playing the key role in the temperature dependence. We show that the variation of the spatial density of atoms with the temperature is the major factor responsible for the temperature dependence of the group velocity.
Sponsorship	APS/Div. Laser Sci. IEEE/Lasers & Electro-Opt. Soc. Opt. Soc. America
File Size	124312
File Format	PDF
ISBN	1557526087
ISSN	10945695
DOI	10.1103/PhysRevA.62.013801
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2000-05-12
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Optical Soc. Of America
Subject Keyword	Atomic measurements Temperature dependence Gases Optical propagation Electromagnetic scattering Resonance light scattering Particle scattering Electromagnetic radiation Electromagnetic propagation Electromagnetic transients
Content Type	Text
Resource Type	Article

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