Optical Masers and Their Possible Applications to Biology

M. Mrad, P.Y. Bourgeois, Y. Kersalé +1 more

The molecular structure of a 3d 5 configuration ion in a trigonal ligand field is theoretically established on the basis of the 252\times252 complete energy matrice. The optical absorption and the electron paramagnetic resonance spectra of the Fe3+ ion in the sapphire crystal (α-Al2 O3) have been studied by diagonalizing the complete energy matrice. The calculated results are in very good agreement with previous experimental observations. The strength of the transition probabilities between pairs of the energy levels have been calculated to determine the possibility to achieve a population inversion in the ground state by applying optical pumping to the crystal. Preliminary results based on the computed transition parameters and on the maser rate equations model show that a 31 GHz maser signal can be effectively generated depending on the cryogenic resonator design.

Bell Telephone Laboratories, Henry E. Breed

Zh A Arakelyan, I G Karayan, R. М. Мartirosyan +1 more

A description is given of a two-frequency ruby maser capable of amplification at frequencies of 1.3 and 9.4 GHz. The values of the inversion coefficients and gains at these frequencies are given. It is shown that the same configuration can be used to widen the maser band when the energy intervals 1?2 and 3?4 between the levels differ by the ESR line width. Possible applications of such amplifiers are indicated.

Leqi Lin

Abstract : A method of achieving optical maser oscillation by electron excitation was investigated. In this scheme, atoms in the ground level, upon being collided by incident electrons, made transitions to excited levels. It was shown that maser oscillation is possible between 2 excited levels, if certain conditions are satisfied. A simple model was used for general analysis, and an Hg vapor system was utilized as an example. (Author)

H. Walther