A.M.Zabelin,A.N.Safonov.

The invention can be used for power lasers with beam high quality. The electrooptical block of laser with fast pumping of working gas contains gas-discharge chamber, drawn along gas stream, with multisection electrode system, where arrangement of sections is parallel with gas stream, and optical resonator, stable and unstable in two orthogonally related planes, transiting through an optical axis, which transverse to a gas stream, while the unstable plane of the optical resonator is perpendicular to a gas stream. The optical resonator can be with even number of passes near even number of electrode systems, thus for beam transmission from pass to pass there are reflecting rotary blocks, converted concerning a gas stream.