Abstract
Soft-x ray amplification has been observed on the Lyman-α transition of hydrogen-like lithium ions by optical-field-induced ionization, using a subpicosecond KrF laser pulse (0.5ps,50 mJ) focused at 1017 W/cm2. A small signal gain coefficient of 20 cm‒1 was obtained at 13.5 nm. Roles of a preformed plasma for the realization of an optical-field-induced ionization x-ray laser are discussed.
© 1993 Optical Society of America
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