Article

Article

Curr. Appl. Phys. 2020; 20(12): 1366-1372

Published online December 31, 2020 https://doi.org/10.1016/j.cap.2020.08.014

Copyright © The Korean Physical Society.

Absorbance and energy levels for a Fe3+ ion in α-Al2O3. Optical pumping applied to a 31 GHz maser

Mrad M., Tarhini A., Giordano V.

Department of Physics, Faculty of Sciences V, Lebanese University, Nabatieh, Lebanon; Laboratoire FEMTO-ST, 26 Chemin de L'Epitaphe, Besançon, 25000, FranceMrad, M., Department of Physics, Faculty of Sciences V, Lebanese University, Nabatieh, Lebanon; Tarhini, A., Department of Physics, Faculty of Sciences V, Lebanese University, Nabatieh, Lebanon; Giordano, V., Laboratoire FEMTO-ST, 26 Chemin de L'Epitaphe, Besançon, 25000, France

Correspondence to:Mrad, M.
Department of Physics, Faculty of Sciences V, Lebanese UniversityLebanon
email: mohamadmrad84@gmail.com

Abstract

The structure of 3d5 configuration ion in a trigonal field is theoretically determined on the basis of a 252×252 matrix of complete energy. The spectra of paramagnetic electron resonance and the optical absorption of the Fe3+ ion in sapphire crystal (α−Al2O3) have been calculated by diagonalizing the matrix of total energy. The obtained results are in good agreement with experimental observations. The strength of probability transitions between energy levels pairs are also established to show the possibility for achieving the inversion of the population in the fundamental state when applying the optical pumping mechanism to the crystal. The results based on the computed parameters of transition and on the maser effect equations show that a maser signal of a 31 GHz can be generated and that depends on the cryogenic design of the resonator. © 2020 Korean Physical Society

Keywords: Absorbance, Energy-levels, Maser effect, Molecular Hamiltonian, Shuffled complex evolution, State equations, Transition parameter

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