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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Magnetically induced inversionless amplification

Nelly Pavlovna Konopleva, Anatolii M Tumaikin

Published Feb 25, 1999• 0 citations

Abstract

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.

DOI: 10.1117/12.340121

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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.

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.

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.

We consider a three-level medium with low-frequency separation between the two upper levels. The medium interacts with an external field that induces a coherence between the two upper levels. We analyze the amplification condition for the probe monochromatic optical field in a general nonresonant case. We show that amplification without population inversion arises either at line center or at the sidebands, depending on the sign of the population difference between the upper sublevels. This amplification occurs in a limited range of the coherent pump intensity.

The general nonlinear stationary theory of propagation of an elliptically polarized pulse that resonantly interacts with the 1/2-1/2 transition is developed taking into account relaxation processes. It is shown that interference of magnetic sublevels in the field of polarized radiation that optically pumps atoms results in inversionless amplification of radiation. Taking into account the Doppler broadening of spectral lines shows that there exists a certain optimal length of the resonant medium along which the radiation that emerges from the medium is maximally amplified.