Abstract

As is well known, the cross section for induced emission is rapidly decreased with growing the transition frequency because of both the decrease of the wavelength and the increase of the Doppler linewidth, which is proportional to transition frequency. As a result, observing of induced gamma emission is unlikely unless a deep cooling of a gas (or beam) of excited nuclei down to microKelvin temperatures is fulfilled^1,2 or the Mossbauer recoilless radiative transitions of nuclei in solids are used^3,4 to avoid thermal broadening of the emission line. Both ways, unfortunately, bring numerous well-known complications that have been insurmountable until now.^1–4

© 1996 Optical Society of America