Electric field induced second harmonic (EFISH) generation using a ns pulse duration laser has been employed for time-resolved measurements of the axial and transverse electric field in a pin-to-pin ns pulse discharge in ambient air, at atmospheric pressure and at 2 bar. The results demonstrate that the time-varying electric field can be measured accurately over the duration of the laser pulse 15–20 ns long, with the temporal resolution (potentially sub-ns) limited by the response time of the detector. Each data set provides time-accurate electric field over a period of up to 10 ns. Time-resolved electric fields over longer time periods are measured by adjusting the laser Q-switch delay, and using the composite data obtained by overlapping the individual data sets. Absolute calibration of the electric field is obtained from the comparison of the experimental data with the Laplacian field distribution in the discharge gap before breakdown, taking into account the residual charge a...

中文翻译：

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纳秒级二次谐波产生，用于电场测量，时间分辨率短于激光脉冲持续时间

使用ns脉冲持续时间激光器产生的电场感应二次谐波（EFISH）已被用于在大气压和2气压下在环境空气中针对针ns脉冲放电中轴向和横向电场的时间分辨测量酒吧。结果表明，可以在15-20 ns长的激光脉冲持续时间内精确测量时变电场，而时间分辨率（可能低于ns）受探测器响应时间的限制。每个数据集可提供长达10 ns的时间精确电场。通过调整激光Q开关延迟，并使用通过重叠各个数据集而获得的复合数据，可以测量较长时间的时间分辨电场。