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Simultaneous measurements of THz wave and hard X-ray emission from thin andflat water flow when irradiated by double femtosecond laser pulses (800 nm, 35fs, transform-limited, 0.5 kHz, delay times up to 15 ns) were carried out atthe transmission and the reflection sides of the flow with THz time-domainspectroscopy and Geiger counters. THz wave emission spectra show their dynamicpeak-shifts toward the low frequency with the highest intensity enhancementsmore than 1.5 x 10^3 times in |E|^2 at the delay time of 4.7 ns between the twopulses, while X-ray intensity enhancements are limited to about 20 times at 0ns under the same experimental conditions. The mechanisms for the spectralchanges and the intensity enhancements in THz wave emission are discussed fromthe viewpoint of laser ablation on the water flow induced by the pre-pulseirradiation.

Giant enhancement of THz wave emission underdouble pulse excitation of thin water flow