Laser apparatus with preionization

Details Laser apparatus with preionization Laser apparatus with preionization

H - Electricity

01

S

345/42

H01S 3/092 (2006.01) H01S 3/0971 (2006.01)

Patent

CA 2037850

TITLE OF THE INVENTION LASER APPARATUS WITH PREIONIZATION ABSTRACT OF THE DISCLOSURE A laser apparatus with preionization comprises: a laser medium; main electrodes for produce a glow discharge therebetween; an optical resonator; a first capacitor for storing a first charge used for production of the glow discharge; a preionizing circuit including a spark gap and a second capacitor connected to the spark gap in series for illuminating the laser medium around the electrodes with sparks developed between the spark gap in response to charging of the second capacitor through the spark gap with a second charge, the preionizing circuit being connected to the first capacitor in parallel; and a charging circuit responsive to a control signal for charging the first and second capacitors with the first and second charges received from a high voltage source. The second capacitor is provided only for discharging, thus the current flows in the spark gap is reduced, so that wear of the spark gap is reduced. Inductance associated with glow discharge is reduced because the spark gap is removed from the discharge circuit including the first capacitor, so that the discharge glow starts rapidly. A coil may be inserted in the preionizing circuit in series to control a current flowing therein.

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