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 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.
Hatanaka
Koji
K
Center for Ultrafast Intense Laser Science, Graduate School of Science, The University ofTokyo, Tokyo 113-0033, Japan. hatanaka@chem.s.u-tokyo.ac.jp
Ida
Takahito
T
Ono
Hiroshi
H
Matsushima
Shin-ichi
S
Fukumura
Hiroshi
H
Juodkazis
Saulius
S
Misawa
Hiroaki
H
D003198:Computer Simulation; D007834:Lasers; D008962:Models, Theoretical; D012542:Scattering, Radiation; D012996:Solutions; D014965:X-Rays
D012996:Solutions