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Sensor Electronics and Microsystem Technologies

NUCLEAR QUANTUM OPTICS: ENERGY APPROACH TO MULTI-PHOTON RESONANCES IN NUCLEI

Alexander V. Glushkov, А. А. Свинаренко

Published Nov 7, 2014• 0 citations
Publisher

Abstract

Modeling nuclear ensembles in a super strong laser field provides opening new field of nuclear quantum optics and nuclear sensorics. In paper a consistent energy approach to multiphoton resonances in nuclei is presented.
DOI
10.18524/1815-7459.2010.2.114146

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GAMMA-RAY OPTICS OF MULTI-BEAM BORRMANN MODES WITH POSSIBLE APPLICATIONS TO NUCLEAR LASING

J. T. Hutton

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•Jan 1, 1986•3 citations
The consistent relativistic energy approach to the finite Fermi-systems (atoms and nuclei) in a strong realistic laser field is presented and applied to computing the multiphoton resonances parameters in some atoms and nuclei. The approach is based on the Gell-Mann and Low S-matrix formalism, multiphoton resonance lines moments technique and advanced Ivanov-Ivanova algorithm of calculating the Green's function of the Dirac equation. The data for multiphoton resonance width and shift for the Cs atom and the 57 Fe nucleus in dependence upon the laser intensity are listed.
The resonant multiphoton resonances shifts and widths and ionization cross-sections for multielectron atoms in a intense laser radiation field are studied. It is carried out a new consistent approach to atom in a strong realistic laser field, based on the relativistic energy formalism (S-matrix adiabatic formalism), relativistic Dirac equation Green function method and relativistic many-body perturbation theory with the Dirac-Kohn-Sham zeroth approximation. In relativistic theory, the Gell-Mann and Low adiabatic formula for energy shift is connected with electrodynamical scattering matrice, which includes interaction with as a laser field as a photon vacuum field (radiative decay). The optimized basis of the relativistic orbitals is generated with using a minimization procedure for the gauge-non-invariant contribution (the fourth-order of the QED perturbation theory) to the radiation width of atomic state. An approach to treating the multiphoton atomic processes is outlined on example of H, Cs, Kr,Mg etc. Analysis shows that the shift and width of the multi-photon resonance line for the interaction “atom- multimode laser pulse” is greater than the corresponding shift and width for a case of the “atom- single-mode pulse” (the Lorenz pulse model) interaction. From the physical point of view it is naturally provided by action of the photon-correlation effects and influence of the laser pulse multi-modity.
There is a possibility that an isomer can be found which could be used to obtain a sufficient population inversion density to bring about nuclear lasing. If it can be realized, a gamma ray laser ("graser") will be a new source of radiation in the sim\\simsim 1A region of unexcelled spectral brightness and coherence, and can be expected to have revolutionary consequences for physics, biology, and chemistry. The result of our research is that the effects of crystallinity are of crucial importance in considerations regarding gamma-ray lasers, bringing in new elements to laser theory which could very well prove decisive in determining whether grasing can or cannot be achieved.\nCertain multi-beam Borrmann eigenmodes of the radiation field in a perfect crystal have much stronger coupling to the emitting nuclei, and much less photoabsorption, than modes in the amorphous case. These modes may be selectively fed by nuclear transitions of the proper multipolarity. A crystal containing such emitters would require orders of magnitude less population inversion density in order to lase than would an amorphous sample of similar material.\nMulti-beam Borrmann modes also have several applications to single-photon optics, particularly the problem of anomalous emission of a gamma\\gammagamma-ray by an internal source of multipolarity M1 or higher. While this effect can occur for a 2-beam Borrmann mode, even stronger anomalous emission is possible into multi-beam Borrmann modes. In addition, certain multi-beam Borrmann modes can anomalously transmit resonant radiation through a Mossbauer crystal. (This cannot occur for the 2-beam modes, except for the case of an E1 transition, since the Borrmann mode couples strongly to the nuclei and thus will be strongly absorbed at resonance.)