Time-resolved absorption spectroscopy using ultrashort soft x-ray pulse from femtosecond laser-produced plasma

Hidetoshi Nakano; Tadashi Nishikawa; Katsuya Oguri

doi:10.1117/12.558586

10 June 2004 Time-resolved absorption spectroscopy using ultrashort soft x-ray pulse from femtosecond laser-produced plasma

Hidetoshi Nakano, Tadashi Nishikawa, Katsuya Oguri

Author Affiliations +

Proceedings Volume 5482, Laser Optics 2003: Superintense Light Fields and Ultrafast Processes; (2004) https://doi.org/10.1117/12.558586
Event: Laser Optics 2003, 2003, St. Petersburg, Russian Federation

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 L_II,III edge. We alo employed a picosecond soft x-ray to measure the spatiotemporal evolution of ablated particles in femtosecond-laser-produced aluminum plasma.

Citation Download Citation

Hidetoshi Nakano, Tadashi Nishikawa, and 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); https://doi.org/10.1117/12.558586

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