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Experimental setup for water-window source using a liquid nitrogen jet target.
Spectrum in the water-window region produced from liquid nitrogen at a laser intensity of of pulsed Nd:YAG laser. A Ti filter was used for quasimonochromatic spectrum. The inset is the transmission curve of the filter.
Angular distribution of the radiation at a laser intensity of of pulsed Nd:YAG laser.
Conversion efficiency of , laser light to the radiation for different laser intensities. The data are connected by a line for the better visibility.
Conversion efficiency of , femtosecond laser light to radiation (∎: , ●: , and ▴: ). Data are connected for the better visibility.
The laser intensity of the maximum conversion efficiency vs the pulse duration. The data fitting shows that the laser intensity for the maximum conversion efficiency is proportional to , where .
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