ИСТИНА

In this talk new approach is proposed to generate VUV or XUV radiation from a plasma channel formed in a gas media by high-intensity laser pulse. It is based on the interference stabilization (IS) phenomenon and population trapping in high-lying excited (Rydberg) states near the continuum boundary resulting in the inverse population between the set of Rydberg states and the ground state. Estimations for the possible gain factor are performed and it is demonstrated that for typical conditions of IS the gain factor for the VUV and XUV frequency range can reach ~ 0.1 - 1 cm-1 that makes it possible to obtain VUV and XUV lasing emission in plasma channels produced by high intensity IR laser pulse. We would also note that the VUV or XUV lasing effect based on the IS stabilization phenomenon probably can be observed in filaments at rather far away distances from the source of intense IR laser radiation