Many-body phenomena in type-II quantum-well and quantum-well-wire superlattices

Here S,, S,, is an amplification and absorption cross section, and 6, is a nonresonant absorption cross section. It is difficult to combine the essential super high cooling down to T < K with a simultaneous excitation from an extemal source. Below it is shown for the first time that the realization of a condition oz > r, > AmD required for a self-absorption takes place automatically in a certain interval of gamma-quantum energies. The matter is that the earliest project of gamma-laser creation has been considered only in the range of Mossbauer effect existence with hoO 10 kev. In this range 5 i / z to B io-'.