论文标题
THZ波发射的巨型增强稀水流的双重脉冲激发
Giant enhancement of THz wave emission underdouble pulse excitation of thin water flow
论文作者
论文摘要
当双双秒激光脉冲（800 nm，35 fs，35 fs，变换限制，0.5 kHz，最高15 ns的延迟时间）与THZ时光镜像和Geiger的反射侧进行反射侧，同时测量了THZ波和硬X射线发射从稀薄和平坦的水流中从薄和平坦的水流中产生的硬X射线发射。 THZ波发射光谱显示了它们向低频的动态峰值移位，最高强度增强大于1.5 x 10^3倍在| e |^2中，在两种脉冲之间的延迟时间为4.7 ns，而在相同的实验条件下，在0 ns时，X射线强度增强量约为20倍。从脉冲预辐射引起的水流上的激光消融的角度讨论了光谱变化和强度增强的机制。
Simultaneous measurements of THz wave and hard X-ray emission from thin and flat water flow when irradiated by double femtosecond laser pulses (800 nm, 35 fs, transform-limited, 0.5 kHz, delay times up to 15 ns) were carried out at the transmission and the reflection sides of the flow with THz time-domain spectroscopy and Geiger counters. THz wave emission spectra show their dynamic peak-shifts toward the low frequency with the highest intensity enhancements more than 1.5 x 10^3 times in |E|^2 at the delay time of 4.7 ns between the two pulses, while X-ray intensity enhancements are limited to about 20 times at 0 ns under the same experimental conditions. The mechanisms for the spectral changes and the intensity enhancements in THz wave emission are discussed from the viewpoint of laser ablation on the water flow induced by the pre-pulse irradiation.
