10 June 2004 Time-resolved absorption spectroscopy using ultrashort soft x-ray pulse from femtosecond laser-produced plasma
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Abstract
High-density plasma created near a solid surface by an intense femtosecond laser pulse emits ultrashort x-ray pulses that are synchronized with the laser pulse. We show the spectral and temporal properties of broadband soft x-rays emitted from a femtosecond laser-produced plasma on a metal surface. The soft x-ray emission was increased about 20-fold by fabricating an array of nanocylinders on a gold surface. We demonstrate the cross-correlation measurement of soft x-ray pulse duration in the femtosecond region by using an optical field-induced ionization process in Kr gas. We used a 10-ps soft x-ray pulse to demonstrate the time-resolved absorption measurement of optically excited silicon near its LII,III edge. We alo employed a picosecond soft x-ray to measure the spatiotemporal evolution of ablated particles in femtosecond-laser-produced aluminum plasma.
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Hidetoshi Nakano, Hidetoshi Nakano, Tadashi Nishikawa, Tadashi Nishikawa, Katsuya Oguri, Katsuya Oguri, } "Time-resolved absorption spectroscopy using ultrashort soft x-ray pulse from femtosecond laser-produced plasma", Proc. SPIE 5482, Laser Optics 2003: Superintense Light Fields and Ultrafast Processes, (10 June 2004); doi: 10.1117/12.558586; https://doi.org/10.1117/12.558586
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