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Demonstration of transient gain x-ray lasers near 20 nm for nickellike yttrium, zirconium, niobium, and molybdenum

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Abstract

We demonstrate strong lasing on the Ni-like 4d S014p P11 transition at 18.9, 20.3, 22.0, and 24.0 nm for Mo, Nb, Zr, and Y ions, respectively, using the transient collisional excitation scheme. Approximately 5 J of laser energy in a combination of a 600-ps pulse and a 1-ps pulse from the Compact Multipulse Terawatt (COMET) tabletop laser system is used to irradiate slab targets of these materials. Small-signal gains of 1726 cm-1 are determined on the 4d4p transition, with overall gain–length products gL of 11–12. Lasing is observed and gain is measured on the 4f P114d P11 transition, which is pumped by collisional excitation combined with self-photopumping, for what is to our knowledge the first time.

© 1999 Optical Society of America

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