We report what is to our knowledge the first experimental study of beam quality and prepulse effect for a deeply saturated neonlike Zn soft-x-ray laser at 21.2 nm, comparing two distinct regimes of operation: amplified spontaneous emission (in single pass) and double pass. The single-pass x-ray laser output emitted by a 30-mm-long plasma column delivers a smooth, highly symmetric ellipsoidal beam with horizontal and vertical divergence of 3(±0.5) and 5(±0.5) mrad, respectively. With a half-cavity consisting of a Mo:Si flat multilayer mirror, the x-ray laser output is boosted by factor of ∼11, providing a narrowly collimated beam with horizontal and vertical divergence of 3.8(±0.5) and 5.8(±0.5) mrad, respectively. The dependence of the beam parameters on the half-cavity setup and on the level of prepulse is described and discussed.
© 2003 Optical Society of America
(140.3460) Lasers and laser optics : Lasers
(140.7240) Lasers and laser optics : UV, EUV, and X-ray lasers
(340.7480) X-ray optics : X-rays, soft x-rays, extreme ultraviolet (EUV)
(350.5400) Other areas of optics : Plasmas
Tomáš Mocek, Bedřich Rus, Ansgar R. Präg, Michaela Kozlová, Gérard Jamelot, Antoine Carillon, and David Ros, "Beam properties of a deeply saturated, half-cavity zinc soft-x-ray laser," J. Opt. Soc. Am. B 20, 1386-1391 (2003)