Saturated output tabletop X-ray lasers

Citation
J. Dunn et al., Saturated output tabletop X-ray lasers, J PHYS IV, 11(PR2), 2001, pp. 19-26
Citations number
24
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
JOURNAL DE PHYSIQUE IV
ISSN journal
1155-4339 → ACNP
Volume
11
Issue
PR2
Year of publication
2001
Pages
19 - 26
Database
ISI
SICI code
1155-4339(200107)11:PR2<19:SOTXL>2.0.ZU;2-U
Abstract
The high efficiency method of transient collisional excitation has been suc cessfully demonstrated for Ne-like and Ni-like ion x-ray laser schemes with small 5 - 10 J laser facilities. Our recent studies using the tabletop COM ET (Compact Multipulse Terawatt) laser system at the Lawrence Livermore Nat ional Laboratory (LLNL) have produced several x-ray lasers operating in the saturation regime. Output energy of 10 - 15 muJ corresponding to a gL prod uct of 18 has been achieved on the Ni-like Pd 4d --> 4p transition at 147 A ngstrom with a total energy of 5 - 7 J in a 600 ps pulse followed by a 1.2 ps pulse. Analysis of the laser beam angular profile indicates that refract ion plays an important role in the amplification and propagation process in the plasma column. We report further improvement in the extraction efficie ncy by varying a number of laser driver parameters. In particular, the dura tion of the second short pulse producing the inversion has an observed effe ct on the x-ray laser output.