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Journal of Experimental and Theoretical Physics Letters

Gain without inversion in a medium of 1/2→1/2 atoms

Nelly Pavlovna Konopleva, Anatolii M Tumaikin

Published Sep 1, 1998• 0 citations
Publisher

Abstract

Amplification of a probe field without inversion in a medium of non-degenerate two-level atoms pumped by a circularly polarized optical field in resonance with a 1/2→1/2 atomic transition in the presence of a dc magnetic field orthogonal to the wave vector of the pump field is demonstrated. It is shown that gain without inversion is possible in strong optical and magnetic fields in the case of a pump with a finite spectral width which can be much greater than the natural width of the excited level.

DOI
10.1134/1.567878

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arXiv:quant-ph/0504045•Europhysics Letters (EPL)•Feb 24, 2005•4 citations
Amplification of a probe field without inversion in a medium of non-degenerate two-level atoms pumped by a circularly polarized optical field in resonance with a 1/2→1/2 atomic transition in the presence of a dc magnetic field orthogonal to the wave vector of the pump field is demonstrated. It is shown that gain without inversion is possible in strong optical and magnetic fields in the case of a pump with a finite spectral width which can be much greater than the natural width of the excited level.
The propagation of a probe field in a medium consisting of two-level atoms, degenerate in relation to the J g = 1/2 → J e = 1/2 transition, is examined. The atoms are pumped by a circularly polarised resonant field in the presence of a static magnetic field. It is shown that under these conditions one of the normal waves may be amplified in the absence of inversion in the medium. In strong optical and magnetic fields, inversion-free amplification is possible for a pump with a finite spectral width, which may be much greater than the natural width of the excited level.
A probe field propagation in a medium of two-level Jg equals .5 yields Je equals .5 atoms, has been theoretically investigated. The atoms are pumped by a circular polarized optical field. An applied static magnetic field is orthogonal to the direction of the pump field propagation. The case of the pump is a coherent field and Gaussian- Markovian random process with a finite bandwidth of the noise have been analyzed. We have obtained that one of the normal waves can amplify in the absence of population inversion both for coherent and partially coherent pump. For the pump with a finite-bandwidth amplification occurs when the Larmor frequency and the Raby frequency of the pump are of the order of the pump linewidth, which was taken much broader than the natural width of the excited state.
Propagation of a weak probe optical beam through a three-level medium pumped with a microwave strong beam is numerically studied. P-scheme of transitions under the conditions providing the amplification of the probe field without inversion is taken to calculate the atomic polarization which enters the paraxial wave equations. Diffraction and self-action of beams due to nonlinear absorption and refraction are properly taken into account. These effects together with linear absorption and refraction form a complex distribution of gain across the beams. As a result the amplified beam acquires ring transverse patterns and slight asymmetry in the frequency characteristics.
Abilities of the method of accumulation of coherent unstable response of a medium for amplification of the rotated component of the probe wave’s polarization in the atomic medium of three-level atoms are studied. Probe wave is examined in frames of the perturbation theory and its frequency is considered near to one photon resonance from the ground to the first excited level. The intense monochromatic pump field connects two excited energy levels and propagates through the medium without a change. The broadening of spectral lines caused by the relaxation processes and the Doppler broadening are included into the calculations. It is shown that by multiple consistent instantaneous change of input probe field’s phase from 0 to π and back, it is possible to obtain, in the tail part of the rotated component of the probe field, a separate narrowed light pulse along with the increase in intensity by more than an order of magnitude with respect to the input field.