薄水流双脉冲激励下THz波辐射的巨增强
Giant enhancement of THz wave emission underdouble pulse excitation of thin water flow
摘要：
利用太赫兹时域光谱仪和盖革计数器，在薄而平坦的水流透射面和反射面同时测量了双飞秒激光脉冲（800 nm，35 fs，变换限幅，0.5 kHz，延迟时间15 ns）照射下的太赫兹波和硬X射线辐射.太赫兹波发射光谱显示出其动态峰值向低频移动，在两个脉冲之间的延迟时间为4.7 ns时，|E| ^2的最高强度增强超过1.5 x 10^3倍，而在相同的实验条件下，X射线强度增强仅限于0 ns时的20倍左右。从激光烧蚀水流的角度讨论了预脉冲照射引起太赫兹波发射光谱变化和强度增强的机制。
英文摘要：
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.
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