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Journal of Physics Conference Series

Generation of terahertz impulse via an excited localized ensemble of identical particles with a permanent dipole moment

Ashat M. Basharov

Published Aug 1, 2018• 0 citations
Publisher

Abstract

The paper states a simple and analytically solvable model for the generation of low-frequency emission via a localized excited ensemble of identical two-level quantum particles with a permanent dipole moment in conditions of collective spontaneous emission of the atomic ensemble.
DOI
10.1088/1742-6596/1068/1/012002

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The theory of coherent radiation emission in two-level quantum systems with permanent dipole moments at the multiphoton resonant excitation by moderately strong laser fields is presented. A simple analytic formula for the expectation value of a dipole moment operator is obtained. The spectrum corresponding to harmonic generation and low-frequency radiation on the generalized Rabi frequency is investigated both analytically and numerically. The effect of dynamic Stark shift on a dipole spectrum under direct multiphoton resonant excitation is considered.
The paper shows analytically that any resonant interaction of quantum particles in media having no symmetry centre with a high-frequency exciting field produces low-frequency radiation. Media particles may not necessarily have a constant dipole moment. Conditions are identified when carrier frequency of low-frequency radiation coincides with nutational oscillations of resonant level populations and is readily controlled both by high-frequency resonant radiation intensity and by resonance detuning.