Method of and device for amplifying a high-energy laser beam with no transverse lasing

摘要

The invention relates to a method of amplifying a laser beam which includes steps consisting in performing an optical pumping of an amplifying crystal so as to inject into the crystal an optical pumping energy E_total, amplifying the laser beam by means of the amplifying crystal and an optical system with N passes, that is, designed to inject the laser beam into the amplifying crystal N times, N being an integer1. The optical pumping is temporally divided into n partial pumpings, the optical energy of a partial pumping being a fraction of E_total, n being an integer 2≦n≦N and in that the laser beam is injected into the amplifying crystal at least once after each partial pumping.