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Soft-x-ray amplification of the Lyman-α transition by optical-field-induced ionization

1993; American Physical Society; Volume: 71; Issue: 23 Linguagem: Inglês

10.1103/physrevlett.71.3774

1092-0145

Yutaka Nagata, Katsumi Midorikawa, Shoich Kubodera, Minoru Obara, Hideo Tashiro, K. Toyoda,

Atomic and Molecular Physics

We report the first observation of amplification of spontaneous emission on the Lyman-\ensuremath{\alpha} transition of hydrogenlike lithium ions by optical-field-induced ionization. Using a subpicosecond KrF laser (0.5 ps, 50 mJ) focused at ${10}^{17}$ W/${\mathrm{cm}}^{2}$, singly ionized lithium ions have been further ionized to fully stripped states, resulting in the population inversion with respect to the ground state of the hydrogenic ions. A small signal gain coefficient of 20 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$ was obtained.