The patent represents a high power laser with approximately invariable top hat beam profile. Laser is Q-_switched with a variable reflectivity mirror and with an unstable resonator. Its pulse energy is from 200 mJ to 1.6 J or greater. The important characteristic is that the beam profile does not change with pumping conditions on the working surface. This is achieved with an introduction of focal points in to the articulated arms. In each arm are at least two optical cells containing gas at low pressure to avoid ionization.
F.32 International patent
COBISS.SI-ID: 23390759