Nonstationary e-beam pumping of short-pulse VUV-lasers

In the present report the results of the further study of e-beam pumping of active media of short-pulse VUV lasers on excimers of inert gases are informed. In accounts the modified nonstationary model of "plane condenser", charged by thermalized electrons of beam and discharged by opposite currents of plasma electrons was used. In the model the impact ionization of gas atoms by plasma electrons, accelerated in an electrical field of "condenser" is taken into account. In numerical research of this model a three-dimensional boundary surface in the space determined by initial energy of beam electrons W/sub e0/ density of beam current j/sub b0/ and gas pressure P/sub 0/ was found. It is shown that in the space above this surface it is necessary to take into account the impact ionization of atoms by plasma electrons, which show an increase of growth rate of plasma electron concentration during nonstationary stage of existence of peaked electrical field intensity. Thus there is an opportunity of realization of pumping regime by short-pulse "hard-ionizer" with subsequent stage of recombination decay of plasma.