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Title

Chirp effect in hard X-ray generation from liquid target when irradiated by femtosecond pulses

Author(s)

Hatanaka, Koji;  Ida, Takahito;  Ono, Hiroshi;  Matsushima, Shin-ichi;  Fukumura, Hiroshi;  Juodkazis, Saulius;  Misawa, Hiroaki

Abstract

The chirp effect on a X-ray emission intensity from a CsCl aqueous solution jet irradiated by femtosecond pulses was systematically studied. The p-polarized chirped pulses were more efficient as compared with the shortest pulses determined by the spectral bandwidth. The negatively-chirped pulses of approximately 240 fs duration produced up to 1.0 times larger X-ray intensity as compared with the transform-limited 1.60 fs pulses. The angular dependence of X-ray generation can be explained by the resonant absorption. Numerical simulations of electron density evolution due to the avalanche and multi-photon absorption supports qualitatively well the experimental observations.

Publication type

Journal article

Source

Optics Express, Vol. 16, no. 17 (Aug 2008), pp. 12650-12657

Publication year

2008

FOR Code(s)

0205 Optical Physics;  0903 Biomedical Engineering;  1113 Ophthalmology and Optometry

Keyword(s)

Avalanches;  Chirp effect;  Chirped pulses;  Femtosecond pulses;  Multi-photon absorption;  Multiphoton processes;  Plasmas;  X-rays

Publisher

Optical Society of America

ISSN

1094-4087

Publisher URL

http://dx.doi.org/10.1364/oe.16.012650

Copyright

Copyright © 2008 Optical Society of America. This paper was published in Optics Express and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://dx.doi.org/10.1364/oe.16.012650. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.

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