Laser generation without inversion on the fine levels of the helium atom

Abstract

By using the example of transfer between fine structure levels in the helium atom, the possibility of laser generation without inversion has been studied.

Theoretical study of the slow light in the assembly of helium atoms

“…In this paper, we will use both perturbation theory and numerical integration of differential equations to obtain expression for group velocity of radiation of a real atomic system. Similar methods of investigations were previously applied to the problem of influence of strong magnetic field on characteristics of emission of ensemble of helium atoms and the problem of possibility of lasering without inversion [7,8]. The results of such an approximate calculation will be checked against similar results obtained by numerical integration of the Liouville-Maxwell partial differential equations.…”

Polarization phenomena in coherent excitation of atomic systems: an overview of results

“…In [39], the feasibility of laser generation without inversion at fine levels of the helium atom is considered. The approach to the generation problem in this work is fundamentally different from that proposed in [37], [38].…”