大気中直流準平等電界ギャップのXeClレーザ誘導破壊遅れ

抄録

Laser-induced breakdown of quasi-uniform field gaps in atomspheric air was caused by an exicimer laser with high energy. This pulse laser up to 0.7J was focused on the different positions of a hemisphere to plane gap axis with dc voltage far, below the spontaneous breakdown voltage. The laser energy dependencies of breakdown voltage and time lag from laser irradiation to voltage collapse associated with a spark were investigated for positive and negative applied voltages and gap lengths of 1 and 2cm.
It was found that the laser-induced breakdown voltage and time lag were dependent on laser energy, laser focused position on the gap axis and polarity of the applied voltage. The discharge processes associated with these laser induced breakdown characteristics were also observed in detail using an image converter camera, He-Ne laser interferometry and capacitive field probe. With such observed results, the breakdown mechanism was correlated with the breakdown characteristics.