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

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...

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Veröffentlicht in:Optics express 2008-08, Vol.16 (17), p.12650-12657
Hauptverfasser: Hatanaka, Koji, Ida, Takahito, Ono, Hiroshi, Matsushima, Shin-ichi, Fukumura, Hiroshi, Juodkazis, Saulius, Misawa, Hiroaki
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Sprache:eng
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Zusammenfassung: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 10 times larger X-ray intensity as compared with the transform-limited 160 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.
ISSN:1094-4087
1094-4087
DOI:10.1364/oe.16.012650