Abstract

We report the observation of extreme UV lasing at 41.81 nm on the 4d⁹5d ¹S₀−4d⁹5p ¹P₁ transition in Xe ix, as proposed by Lemoff, et al. [ Opt. Lett. 19, 569 ( 1994)]. A 10-Hz circularly polarized 800-nm laser pulse with an energy of ∼70 mJ and a duration of ∼40 fs is longitudinally focused to a peak intensity of >3 × 10¹⁶ W/cm² over a length of 8.4 nm in a differentially pumped cell containing 12 Torr of Xe gas. Laser amplification was observed with an estimated gain coefficient of 13 cm⁻¹ and a total gain of exp(11).

© 1996 Optical Society of America

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