Observation of THz radiation interaction between relativistic ionization fron and periodic electrostatic field

我们利用4ω^0的Nd: YAG激光，脉冲持续时间约6 ns，对“DC - AC辐射转换器”进行了实验研究。在静电场与相对论性电离锋的相互作用实验中观察到电磁波的产生。发射的微波脉冲频率（~ 6ns）在9.5 GHz ~ 14.1 GHz之间。输出信号强度与直流偏置电压成正比，功率为2.3。发射的辐射场沿静电场方向极化。发射辐射的脉冲持续时间与电离激光的脉冲持续时间一样长。这表明脉冲持续时间在很大程度上取决于激光的电离过程。

We have experimentally investigated "DARC (DC to AC radiation converter)" using 4ω^0 light of Nd : YAG laser with a pulse duration of〜6 ns. Electromagnetic wave generation has been observed in the interaction experiments between a static electric field and a relativistic ionization front. The frequency of the emitted microwave pulse (〜6 ns) ranges from 9.5 GHz to 14.1 GHz. The output signal intensity is proportional to the DC bias voltages with a power of 2.3. The emitted radiation field is polarized along the static electric field direction. The pulse duration of the emitted radiation is as long as that of the ionizing laser. This indicates that the pulse duration strongly depends on the ionizing process by the laser light.