Abstract

Two separate self-consistent scenarios inherent in achieving induced emission of gamma-rays will be discussed. (A) The stimulation of annihilation of parapositronium atoms in colliding particle and photon beams by external infra-red radiation. It is known, that soft-photon stimulation of two-photon annihilation requires and inadmissible high particle energy (approx. 50 GeV). The new scenario consists of two positronium beams and two infrared photon beams moving in opposite directions and includes three steps : 1) exciting ls-2p transitions of moving relativistic positronium atoms (approx. 80 MeV) by an infrared beam (approx. 80 micrometer) propagating in the opposite direction ; 2) lasing in the beam of these excited atoms, the inversion being achieved as a result of lower-state cleansing due to spontaneous annihilation; and 3) stimulating the annihilation in the opposite positronium beam by Doppler shifted photons from the moving atomic laser realized in the previous step.

© 1994 Optical Society of America