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Quantum Electronics

Inversionless radiation amplification by ions having certain velocities in a magnetic field

А. И. Пархоменко

Published Apr 30, 2002• 0 citations
Publisher

Abstract

It is shown that the imposition of external magnetic field on a gas of ionised particles may give rise to inversionless radiation amplification by the ions having certain velocities, which is due to their Larmor rotation. In this case, the majority of ions may reside in the ground state. The integrated absorption coefficient remains positive due to an increase in the radiation absorption by the other half of ions.

DOI
10.1070/qe2002v032n04abeh002184

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It is shown that the imposition of external magnetic field on a gas of ionised particles may give rise to inversionless radiation amplification by the ions having certain velocities, which is due to their Larmor rotation. In this case, the majority of ions may reside in the ground state. The integrated absorption coefficient remains positive due to an increase in the radiation absorption by the other half of ions.
It is shown that upon the application of an external magnetic field, a gas of ionized particles may experience noninversive partial velocity amplification of radiation by ions due to their Larmor rotation. In this case, virtually all ions may be in the ground state. It may happen that approximately half the number of ions in the medium amplify the incident radiation. The integrated absorption coefficient remains positive due to the enhancement of absorption of radiation by the other half of ions. Noninversive amplification of radiation takes place when the condition ω c ≳Γ 2 / kv T is satisfied ωw c is the cyclotron frequency of ions in the magnetic field; Γ is the homogeneous half-width of the absorption line for ions, and kv T is the Doppler width). In the case of interaction of atomic ions with radiation in the optical range, this corresponds to magnetic fields B ≳600 G (for the ion mass M ∼10 amu). Noninversive partial velocity amplification of radiation is a “latent” effect in the sense that it disappears upon averaging over all velocity directions of ions. This effect is associated with the emergence of phase incursion of the induced dipole moment oscillations for ions moving in circular cyclotron orbits, which depends on the ion velocity.
A possibility of inversionless amplification of light by non-dipole molecules oriented state-selectively by means of superimposing of external laser radiation is considered. Various variants of mutual direction of electrical vectors of the probe and orienting fields are numerically analysed for specific ratios of the orientation parameters of the ground and excited states both in pulsed and stationary regimes. It is shown that the variant in which the signs of the orientation parameters of the ground and excited states are opposite is the most promising. The latter can be implemented in selection of the orienting field frequency.
Amplification of probe radiation by an inversionless two-level system in the 'red' wing of its spectral line is studied theoretically during the resonance absorption of intense cw laser radiation. The effect is caused by the inequality of the spectral densities of the Einstein coefficients for absorption and stimulated emission outside the absorption line under conditions when homogeneous broadening, due to the interaction of particles with the buffer gas, significantly exceeds the natural broadening (at high pressures of the buffer gas). It is found that the larger the inversionless gain, the higher the buffer gas pressure and the pump radiation intensity. It is established that at high enough pump intensity, the probe field is amplified along the entire region of the 'red' wing of the line (at any negative detunings of the probe field frequency).
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.
A study is reported of the influence of a phase memory in the presence of collisions on the work done by a field and on a light-induced drift of two-level gas particles in the Lorentz model of a gas (heavy buffer particles). It is shown that a phase memory may result in amplification of the incident radiation by particles at certain velocities in the absence of a population inversion (when practically all the particles are in the ground state). A phase memory is shown to have a strong influence on the light-induced drift if the collision frequency is much higher than the Doppler width of an absorption line: the drift calculated ignoring the influence of a phase memory may be strongly underestimated.
The possibility of inversionless amplification of light by dichroic polar molecules oriented selectively by states by applying an external pulsed electric field is considered. It is shown that when the orienting field is switched on abruptly, transient processes occur that lead to an increase in the light gain coefficient, which can be several times greater than its value in the quasi-stationary mode. An interpretation of the effect is given based on a comparison of the interaction energy of molecules with the orienting field in the ground and excited states.