Threshold Conditions for Terahertz Laser Discharge in Atmospheric Gases
Threshold Conditions for Terahertz Laser Discharge in Atmospheric Gases
复制标题
大气中太赫兹激光放电的阈值条件
DOI：
10.1007/s10762-017-0380-3
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
P. Koshlyakov
中科院分区：
文献类型：
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作者：
V. Kubarev;Y. Getmanov;O. Shevchenko;P. Koshlyakov
利用新西伯利亚自由电子激光器（NovoFEL）的高功率太赫兹辐射，精确测量了四种大气气体的击穿阈值。130 μm的74 ps脉冲的击穿强度为1.1- 1.4GW/cm ~ 2。这些数据进行了比较与计算的基础上的击穿和随机微波加热的电子的经典理论的唯象标准。提出的是一个准连续的等离子体放电的阈值条件，是通过一个序列的脉冲的NovoFEL保持。在5.6 MHz的脉冲重复率下，放电猝灭阈值比击穿阈值低15-60%，这取决于等离子体出现的量。
In this study, we accurately measured the breakdown thresholds in four atmospheric gases using the high-power terahertz radiation of the Novosibirsk free electron laser (NovoFEL). The breakdown intensities of the 130-μm radiation in a form of 74-ps pulses were equal to 1.1–1.4 GW/cm2. These data have been compared with calculations based on a phenomenological criterion for a breakdown and the classical theory of stochastic microwave heating of electrons. Presented are threshold conditions for a quasi-continuous plasma discharge that is maintained by means of a sequence of pulses of the NovoFEL. At a pulse repetition rate of 5.6 MHz, the discharge quenching thresholds are 15–60% lower than the breakdown thresholds depending on the amount of plasma emerging.