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Journal of Physics B Atomic and Molecular Physics

Plasma satellites in the presence of non-resonant, coherent and polarised radiation

H. W. Drawin, Truong-Bach

Published Dec 14, 1982• 2 citations
Publisher

Abstract

Satellite lines emitted by a three-level atomic model in the presence of longitudinal electrostatic plasma waves and a non-resonant laser radiation field are investigated by calculating the autocorrelation function of the emitted light wave up to fourth order in the perturbation energy of the atomic system. Both the plasma wave and the radiation fields lead to a shift of the second-order Baranger and Mozer (1961) plasma satellites and of the allowed line. The intensities of the plasma satellites are enhanced by the laser radiation field. Under certain frequency conditions satellites pertaining to the radiation field appear in absorption. The same phenomenon occurs for the plasma satellites when the atoms are subjected to a single-mode plasma wave field.

DOI
10.1088/0022-3700/15/23/028

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Satellite lines emitted by a three-level atomic model in the presence of longitudinal electrostatic plasma waves and a non-resonant laser radiation field are investigated by calculating the autocorrelation function of the emitted light wave up to fourth order in the perturbation energy of the atomic system. Both the plasma wave and the radiation fields lead to a shift of the second-order Baranger and Mozer (1961) plasma satellites and of the allowed line. The intensities of the plasma satellites are enhanced by the laser radiation field. Under certain frequency conditions satellites pertaining to the radiation field appear in absorption. The same phenomenon occurs for the plasma satellites when the atoms are subjected to a single-mode plasma wave field.
Atomic absorption spectra of the He I plasma in the static magnetic field in the absence of laser radiation are different from spectra in the presence of laser radiation. Especially, it has been theoretically predicted that the spectral shift of the satellite line, which is seen in the latter case, does not exist in the former case. In this paper, the effect of three-dimensional high-frequency electric fields on the σ+, σ−, and π components of the allowed 1 1S0-3 1P1 transition and the forbidden 1 1S0-3 1D2 lines in atomic absorption spectra of the He I plasma in a static magnetic field in the absence of a laser beam is investigated from the coupled equations for the probability amplitudes of atomic states. It is shown that they should give rise to a spectral shift of the allowed lines and satellites about forbidden lines. The calculation reveals that the shift is proportional to the mean-square stochastic electric field, and that the ratio of the intensity of the near satellite to that of the far satellite is different from the ratio obtained by the second-order perturbation theory or the three-level rotating-wave approximation. Discussion is given for the validity of this theory.
We have observed several different satellite transitions among HeI excited states. These satellites were induced by large, near-resonant, spatially inhomogeneous electric fields. A simple theory was proposed to explain the line shape of both the satellite and the allowed line based on the rotating-wave approximation. The plasma was contained in a dielectric waveguide and the laser mode pattern inside the guide was calculated and incorporated into the line-shape function. It was shown that excellent agreement between theory and experiment could be obtained over a wide range of experimental parameters. Agreement was very good in regimes where perturbation theory fails. We also observed that at high field strengths the Stark shift of the allowed component was less than the three-level theory predicted. We attribute this error to the fact that we have ignored all of the remaining levels of the HeI system.
Radiation spectrum from a three-level system perturbed by near-resonant oscillating electric field is investigated when the amplitude of oscillation is fluctuating stochastically. To calculate the wave function of the system, the rotating-wave approximation is used and P -level degeneracy is correctly considered. The stochastic fluctuation is assumed to be a Gaussian process, and profiles of allowed and near-satellite lines are calculated for several sets of parameters of the Gaussian process. Connection to collective modes and their interactions in a turbulent plasma is also discussed.
Within the rotating-wave and Magnus approximations, the electrical anharmonicity induced in an atom or molecule aligned by a static electric field is shown to lead to the absorption of many photons delivered by a Gaussian-modulated laser pulse of finite intensity and duration. In the presence of the static field the effective area of the near-resonant pulse vanishes at prescribed intensity-dependent frequencies, resulting in the appearance of satellite fringes flanking the usual Gaussian line shape. The transition probability for excitation of the oriented system by a train of phase-coherent Gaussian pulses is calculated.
This chapter presents a study of various nonlinear effects in the radiation of satellites of non-hydrogenic spectral lines from plasmas and their applications. This kind of satellites are possible in spectral lines of helium and lithium atoms, as well as in spectral lines of the He-like and Li-like ions. We cover the early theoretical results obtained for the situation where the quasimonochromatic electric field (causing the satellites) is relatively weak, so that the effects can be described in frames of the perturbation theory. Then we cover theoretical and experimental results obtained for stronger fields: the adiabatic theory of satellites and its applications, as well as the case where the frequency of the quasimonochromatic electric field is much greater than the corresponding atomic frequencies.
New interesting effects arise, when three-level atoms interact with the plasma, laser field, or a heat bath. If the atoms inside the plasma are excited by the polarized laser pulse or an electron beam, the line wings of the radiation are completely polarized, while the line core is only partially polarized. The Einstein coefficients are generalized to the case, when the atomic decay channels are subject to quantum interference. Such atoms may develop nonzero quantum coherence between upper levels, if they are in contact with the heat bath in thermal equilibrium. This coherency changes the emissivity of the medium and hence can be experimentally observed. In the case when three-level atoms interact with the laser field, spontaneous emission can be suppressed over the whole frequency spectrum.