Abstract
We report the observation of small group velocities of order 90 meters per second, and large group delays of greater than 0.26 ms, in an optically dense hot rubidium gas (~360 K). Media of this kind yield strong nonlinear interactions between very weak optical fields, and very sharp spectral features. The result is in agreement with previous studies on nonlinear spectroscopy of dense coherent media.
Highlights
In this report we show that by a proper choice of experimental parameters such as atomic density and optical intensity, very large group delay of light can be observed in a cell of hot (360 K) 87Rb atoms
We demonstrate here that this relatively created medium displays very strong nonlinear coupling between very weak optical fields [5]
With such a thermal ensemble of rubidium atoms, we observe (1) group delay (Tg) of 0.26 ms for propagation through our 2.5 cm long, optically thick, electromagnetically-induced transparent (EIT) medium, and (2) extremely efficient nonlinear interactions. These two aspects of phaseonium are closely related: Tg will be shown to be the figure of merit for various linear and nonlinear optical processes using EIT (see e.g. Eq (7) and Ref. [5])
Summary
“Ultraslow Group Velocity and Enhanced Nonlinear Optical Effects in a Coherently Driven Hot Atomic Gas.”. Ultra-Slow Light and Enhanced Nonlinear Optical Effects in a Coherently Driven Hot Atomic Gas. Michael M.
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