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Journal of Physics Conference Series

Variants of the light pulses controlling under conditions of double radio-optical resonance

A. S. Timofeev

Published Dec 10, 2014• 0 citations
Publisher

Abstract

On the bases of semi-classical theory of the laser light interaction with a cold atomic cloud, specifically, of the electromagnetically induced transparency (EIT), repeated reproduction and modulation of the light pulses are investigated. A scheme of the light pulses control by the use of radio-frequency (RF) pulses is shown to be very effective. Short RF pulses of appropriate areas stimulate repeated playbacks of the output light pulses similar to the input one.

DOI
10.1088/1742-6596/572/1/012042

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On the bases of semi-classical theory of the laser light interaction with a cold atomic cloud, specifically, of the electromagnetically induced transparency (EIT), repeated reproduction and modulation of the light pulses are investigated. A scheme of the light pulses control by the use of radio-frequency (RF) pulses is shown to be very effective. Short RF pulses of appropriate areas stimulate repeated playbacks of the output light pulses similar to the input one.
On the basis of the semiclassical theory of the laser light interaction with a cold atomic cloud it is shown that, under conditions of three-fold degeneracy of the Λ-scheme's ground-level, the effects of electromagnetically induced transparency and the significant reduction of group velocities are realized for two light pulses of different polarization and shape in the presence of the controlling light wave. Their effective joint reproduction when switching on the controlling light after a dark pause is demonstrated.
Electromagnetically-induced transparency (EIT) of atomic medium interacting with two laser beams can exhibit effects of reciprocal influence of both beams on optical properties of the medium. If the probe beam reaches instantaneous intensity comparable to that of the control beam, considerable energy is transferred to the latter. Resulting increase in the control-beam intensity temporarily modifies EIT conditions and consequently affects propagation of probe-beam pulses. The effect is particularly strong in atomic media exhibiting significant dissipation of radiation energy due to relaxation processes efficiently counteracting the optical pumping. Coherent interaction of atoms with both beams causes reduction of dissipation of the control beam (reciprocal EIT conditions). Our experiments with hot rubidium vapor demonstrate the possibility of dual control over slow propagation of light pulses in such media. Besides the well-known dependence on input control-beam intensity, the delays of output probe pulses depended significantly also on the energy of input probe pulses. Moreover, for relatively short input pulses, very specific shape of output pulses was observed, invariant in wide ranges of input probe pulse energies and control-beam intensities. The shapes of the output pulses were also the same for short input pulses of different shapes as well as for pulses temporarily stored in the medium by switching off the control beam during their propagation.
This thesis investigates the result of modulation schemes in electromagnetically induced transparency (EIT) in rubidium vapor. Through the process of EIT, a control beam can be used to change the optical properties of a medium experienced by a probe field, generating a transparency window. The corresponding change in index of refraction results in slowed group velocity while the beam propagates through the medium. Modulation is used to transmit a message signal through a medium. In classical systems, this entails converting data into a radio frequency by adding a message to an electronic or optical carrier signal. The properties of EIT, light-slowing, and their impacts on a probe pulse with modulation will be confirmed through a detailed semi-classical analysis and by experimental observation.
We propose a method of all-optical investigation of radiofrequency (RF) radiation based on the coherent effect of electromagnetically induced transparency (EIT). It is shown that if the atomic coherence is perturbed by an RF field, the shape of probe pulse propagating in a three-level Λ-type atomic medium under EIT conditions is modified correspondingly to the temporal structure of the RF pulse. The effect is sensitive to the parameters of the pulse which enables measuring the intensity and the spectrum of the RF pulse. The method can be used for storage and lossless transfer of RF information over long distances using optical pulses.