Abstract
Soft x-ray amplification has been observed over the wavelengths of 14.3 nm — 4.6 nm in nickel-like ions of various atoms with the atomic numbers of Z=47 (Ag) to 72 (Hf). These results were obtained by irradiation of a preformed plasma with a short duration laser pulse. Observation of polarization of the amplified soft x-ray radiation infers that the population inversion is strongly affected by the trapping of the resonance radiation. Conditions for increasing the population inversion density by pumping with shorter-duration laser pulses due to transient effects are examined.
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