title: Chirp effect in hard X-ray generation from liquid target when irradiated by femtosecond pulses.
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 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.
authors: Center for Ultrafast Intense Laser Science, Graduate School of Science, The University ofTokyo, Tokyo 113-0033, Japan. hatanaka@chem.s.u-tokyo.ac.jp
authors: Koji
authors: K
authors: Hatanaka
authors: Takahito
authors: T
authors: Ida
authors: Hiroshi
authors: H
authors: Ono
authors: Shin-ichi
authors: S
authors: Matsushima
authors: Hiroshi
authors: H
authors: Fukumura
authors: Saulius
authors: S
authors: Juodkazis
authors: Hiroaki
authors: H
authors: Misawa
mesh_terms: D003198:Computer Simulation; D007834:Lasers; D008962:Models, Theoretical; D012542:Scattering, Radiation; D012996:Solutions; D014965:X-Rays
chemical_list: D012996:Solutions