Abstract
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 Kα and Heα line emissions. In case of oblique incidence, resonance absorption made it possible to maximize Kα emission while keeping pulse duration short. On the other hand, Heα line emission was maximized when a separation between two laser pulses was large, resulting in pulse broadening (∼30 ps).
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