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- W2076390583 abstract "High intensity Cu Kα X-ray was generated in helium at atmospheric pressure (760 torr) using a commercial millijoule high-repetition rate Ti: sapphire laser. The characteristic Kα X-ray was generated by focusing the 0.06 mJ－1.46 mJ, 100 fs and 1 kHz repetition femtosecond laser onto a solid Cu target to a spot with a 5 μm diameter. We obtained the characteristic Kα X-ray of 5.4 × 109 photos/s into 2π sr at a 1 kHz repetition rate with 5.0 × 10-6 conversion efficiency. Kα X-ray intensity can be enhanced with 4－8% prepulse plasma into 7.7 × 109 photos/s/sr with 6.8 × 10-6 conversion efficiency. The X-ray intensity and conversion efficiency in helium achieved the almost the same level as in vacuum. Such vacuum-free femtosecond X-ray source with a tabletop laser can be a promising and easy accessible tool for time-resolved X-ray diffraction and other radiographic applications. The time-resolved X-ray diffraction experiment would reveal the ultrafast dynamics in crystalline materials, such as coherent phonon vibrations and ultrafast phase transitions." @default.
- W2076390583 created "2016-06-24" @default.
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- W2076390583 date "2009-01-01" @default.
- W2076390583 modified "2023-10-16" @default.
- W2076390583 title "Development of femtosecond X-ray source in helium atmosphere with millijoule high-repetition-rate femtosecond laser" @default.
- W2076390583 cites W2011135936 @default.
- W2076390583 doi "https://doi.org/10.14723/tmrsj.34.621" @default.
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