Calculations for Ni-like soft x-ray lasers: Optimization for W (43.1 Å)

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Abstract
Near-optimum conditions for lasing in Ni-like W are calculated for a 90-μg/cm2 foil irradiated by a 2ω (λ=0.53 μm), 2.3×1014-W/cm2, 550-ps trapezoidal pulse. The gain coefficient for the J=0–1, 4d-4p Ni-like transition at 43.1 Å is predicted to be 5.5 cm−1. The electron density and temperature are 2.5×1021 cm−3 and 860 eV at x-ray laser time.