Investigation on the breakdown voltage induced by YAG pulsed laser

ZHAN Jian; YANG Ming-jiang

In order to study the principle of laser-induced discharge breakdown and reduce the breakdown voltage (U50) to overcome the processing risk, the relationships between U50 and some factors were carried out, including the single pulse energy, the distance between the electrodes and the cathode materials.It was confirmed that the channel could be broken down effectively only when the surface of the workpiece was vaporized by the laser with the single pulse energy W≤0.15mJ.The breakdown voltage would decrease with the increasing of the single pulse energy.When the cathode material was made of 45 steel, U50 rose with the increase of the distance between the electrodes.And when increasing the single pulse energy,the rising trend would be slowed down obviously.Altering the cathode material with other conditions kept unchanged, it was found that the copper could reduce the U50, compared to graphite.So the effective measure of reducing the U50 is increasing the single pulse energy, decreasing the distance between the electrodes, and using smaller work function and lower melting point material as the cathode materials.

Corresponding author: YANG Ming-jiang, ymjl@imech.ac.cn

1. Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080, China

Received Date: 2008-02-26

Accepted Date: 2008-04-10

Available Online: 2009-04-25

Abstract: In order to study the principle of laser-induced discharge breakdown and reduce the breakdown voltage (U50) to overcome the processing risk, the relationships between U50 and some factors were carried out, including the single pulse energy, the distance between the electrodes and the cathode materials.It was confirmed that the channel could be broken down effectively only when the surface of the workpiece was vaporized by the laser with the single pulse energy W≤0.15mJ.The breakdown voltage would decrease with the increasing of the single pulse energy.When the cathode material was made of 45 steel, U50 rose with the increase of the distance between the electrodes.And when increasing the single pulse energy,the rising trend would be slowed down obviously.Altering the cathode material with other conditions kept unchanged, it was found that the copper could reduce the U50, compared to graphite.So the effective measure of reducing the U50 is increasing the single pulse energy, decreasing the distance between the electrodes, and using smaller work function and lower melting point material as the cathode materials.

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Reference (10)

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Investigation on the breakdown voltage induced by YAG pulsed laser

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References

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