Gas laser generator

A gas laser generator comprising:

• a frame;
• a gas channel having right and left side portions arranged within the frame, through which a gas flows;
• mirror means for obtaining a laser beam, defining a resonant cavity having upper and lower portions and being positioned in the left and the right side portions of the gas channel and mutually opposed to one another;
• an anode electrode arranged in the lower portion of the resonant cavity;
• at least two first cathode electrodes arranged in the upper portion of the resonant cavity in the upstream side of the anode electrode;
• at least two second cathode electrodes arranged in the upper portion of the resonant cavity at a predetermined distance away from the first cathode electrodes in the downstream side of the resonant cavity;
• and
• power source means for applying voltages between the anode electrode and the first and the second electrodes, characterized in that a first voltage of a first electric field between the first cathode electrodes connected to the power source means through a first ballast resistance and the anode electrode and a second voltage of a second electric field between the second cathode electrodes connected to the power source means through a second ballast resistance and the anode electrode are so determined that the second voltage is smaller than the first voltage so that the current flowing in the first electric field may be substantially equal to the current flowing in the second electric field during the electric discharge between the electrodes.