Power source for an axial-flow CO.sub.2 laser tube
AssigneeAmanda Engineering & Service Co., Inc.
InventorRyoji Koseki
Life of this patent
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Abstract
A power device for an axial-flow-type CO.sub.2 laser tube in which a high DC voltage is applied to the cathode side of the laser tube, a ballast resistance is connected to the anode side, and power at a high voltage pulse is applied to this anode side so that laser oscillations occur. In addition, the output of the high voltage pulsed power on the anode side is adjusted by PWM control of the switching circuit, controlling the output of the laser. In this way, the cathodes becomes a common structure, cross discharge is prevented, and the response speed of the power feedback is increased.
Claims20
A power device for an axial-flow-type CO.sub.2 laser shell comprising:
- a high voltage DC power source directly connected to a cathode of said laser shell, in which a discharge for laser pumping takes place, for applying a constant high DC voltage to said cathode;
- and a high voltage pulse power source connected through a ballast resistance to an anode of said laser shell for applying a high pulsed voltage to said aode, said high voltage pulse power source having
- a DC power circuit,
- a switching element having a first terminal to receive a command signal instructing switching operation, and second and third terminals connected or disconnected by said switching operation,
- said second terminal being connectd to said DC power circuit and said third terminal being connected to said anode of said laser shell through ballast resistance, and
- a PWM controller having an output terminal connected to said first terminal of said switching element, for outputting a pulsed voltage with a predetermined repetition frequency and width, as said command signal.
Dependencies are inferred from the claim text.