Laser amplification at 18.2 nm in recombining plasma from a laser-irradiated carbon fiber

Extreme ultraviolet laser amplification has been observed for the C vi Balmer-{α} transition at 18.2 nm, with use of a novel optical system to irradiate up to 1 cm length of carbon fiber target. The measurements were time resolved and indicated peak single-transit amplification of about 30 times.