A gas discharge pre-ionization device

Abstract

The invention discloses a gas discharge preionization apparatus. The gas discharge preionization apparatus comprises discharge electrodes, preionization needles, an insulation substrate, sealing rings, fixing nuts, plug-pull structures and peaking capacitors; the discharge electrodes and the preionization needles perpendicularly pass through the insulation substrate, and are fastened through the sealing rings and the fixing nuts to ensure a good vacuum sealing performance in a laser gas chamber; the preionization needles are uniformly on two sides of a discharge negative electrode along a length direction of the electrode; the two side faces of the electrode are processed to be sharp-edge-shaped, and preionization gaps are formed between the side faces of the electrode and the preionization needles; the preionization needles and the peaking capacitors arranged in the external of the gas chamber are communicated through the plug-pull structures to form a preionization charge and discharge loop; when the discharge electrodes are loaded with pulse high voltage, the preionization gaps are rapidly punctured to form arc discharge to radiate high-strength ultraviolet light to irradiate laser gas medium in the main electrode gaps to realize the ultraviolet light automatic preionization of the medium; since that the preionization needles and the discharge electrodes are positioned in the same plane, the preionization structures have no any influence on flow field structures of circulating gas, so that the gas discharge preionization apparatus is quite suitable for repetition frequency gas discharge lasers.

Description

technical field [0001] The invention belongs to the technical field of gas lasers, and relates to a structure used for a gas pre-ionization device, in particular to a structure suitable for the gas medium pre-ionization of a gas laser. Background technique [0002] In the research of discharge-excited high-power gas laser technology, the principle of laser generation is: the laser pump source forms a pulsed high voltage in the gap between the main electrodes, and at the same time, the pre-ionization device pre-ionizes the gas to generate a certain density of free electrons. The high-voltage gas medium in the electrode gap undergoes uniform body discharge under the combined action of pulse high voltage and pre-ionization. The plasma generated by the discharge excites the laser medium to a high-energy state to form an active medium, and the high-energy state of the active medium transitions to a low-energy state. Optical radiation is formed, and The laser output is generated u...

AI Technical Summary

Problems solved by technology

First, in order to ensure the electrical insulation inside the laser, the size of the pre-ionization structure is large, resulting in a large inductance of the discharge circuit, which affects the overall efficiency of the laser

Second, the peaking capacitor is placed inside the gas chamber, which is inconvenient to install and maintain, and is easily corroded by the gas medium

The third is that the pre-ionization spark gap is placed on both sides of the laser electrode gap. When the laser is in the state of repeated frequency operation, it will affect the circulation flow of the gas medium, and the change of the flow field structure will lead to the decrease of the maximum stable operating frequency of the laser.

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