Abstract

We demonstrate a high-gain nickel-like xenon-ion x-ray laser, using a picosecond-laser-irradiated gas-puff target. The elongated x-ray laser plasma column was produced by irradiation of the gas-puff target with line-focused double picosecond laser pulses with a total energy of 18 J in a traveling-wave excitation scheme. Strong lasing at 9.98 nm was observed, and a high gain coefficient of $17.4 {\mathrm{cm}}^{-1}$ was measured on the transient collisionally excited $4d–4p$, $J=0–1$ transition for nickel-like xenon ions with target lengths as great as 0.45 cm. A weak nickel-like lasing line at a shorter wavelength of 9.64 nm was also observed, with a gain coefficient of $5.9 {\mathrm{cm}}^{-1}$.

© 2002 Optical Society of America

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