Enhanced K-shell x-ray line emissions from aluminum plasma created by a pair of femtosecond laser pulses

Nakano, Hidetoshi; Nishikawa, Tadashi; Uesugi, Naoshi
July 2001
Applied Physics Letters;7/2/2001, Vol. 79 Issue 1, p24
Academic Journal
The influence of an ultrashort prepulse on K-shell x-ray line emissions from Al plasma produced by 100 fs Ti:sapphire laser pulses is studied. By introducing an independent 100 fs prepulse, a more than 20-fold enhancement in K-shell emission was achieved. We could experimentally optimize K[sub α] and He[sub α] line emissions. In case of oblique incidence, resonance absorption made it possible to maximize K[sub α] emission while keeping pulse duration short. On the other hand, He[sub α] line emission was maximized when a separation between two laser pulses was large, resulting in pulse broadening (∼30 ps). © 2001 American Institute of Physics.


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