Experiments on Carbon Balmer-α Soft X-Ray Lasers Pumped with a 12ps KrF Laser

K. MURAI; Y. KATO; R. KODAMA; S. NAKAI; H. SHIRAGA; G. YUAN; L. DWIVEDI; M. H. KEY; J. KRISHNAN; C. L. S. LEWIS; P. NORREYS; G. J. PERT; S. A. RAMSDEN; C. SMITH; G. J. TALLENTS; J. UHOMOIBHI; J. ZHANG

doi:10.2184/lsj.21.6_625

K. MURAI, Y. KATO, R. KODAMA, S. NAKAI, H. SHIRAGA, G. YUAN, L. DWIVEDI, M. H. KEY, J. KRISHNAN, C. L. S. LEWIS, P. NORREYS, G. J. PERT, S. A. RAMSDEN, C. SMITH, G. J. TALLENTS, J. UHOMOIBHI, J. ZHANG

Author information

K. MURAI
Institute of Laser Engineering, Osaka University
Y. KATO
Institute of Laser Engineering, Osaka University
R. KODAMA
Institute of Laser Engineering, Osaka University
Central Laser Facility, SERC, Rutherford Appleton Laboratory
S. NAKAI
Institute of Laser Engineering, Osaka University
H. SHIRAGA
Institute of Laser Engineering, Osaka University
G. YUAN
Institute of Laser Engineering, Osaka University
L. DWIVEDI
Department of Physics, University of Essex
M. H. KEY
Central Laser Facility, SERC, Rutherford Appleton Laboratory
Clarendon Laboratory, University of Oxford
J. KRISHNAN
Department of Physics, University of Essex
C. L. S. LEWIS
Department of Pure and Applied Physics, Queens University of Belfast
P. NORREYS
Central Laser Facility, SERC, Rutherford Appleton Laboratory
G. J. PERT
Department of Computational Physics, University of York
S. A. RAMSDEN
Department of Computational Physics, University of York
C. SMITH
Clarendon Laboratory, University of Oxford
G. J. TALLENTS
Department of Physics, University of Essex
J. UHOMOIBHI
Department of Pure and Applied Physics, Queens University of Belfast
J. ZHANG
Clarendon Laboratory, University of Oxford

Keywords: Soft X-ray laser, Recombination scheme, Hydrogen-like carbon ion, Balmer-α transition

JOURNAL FREE ACCESS

1993 Volume 21 Issue 6 Pages 625-633

DOI https://doi.org/10.2184/lsj.21.6_625

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Abstract

Carbon Balmer-α soft X-ray lasers were studied by using a KrF Raman laser system (SPRITE) at the Rutherford Appleton Laboratory in UK. The studies were carried out in collaboration of the Rutherford Appleton Laboratory and the Institute of Laser Engineering, Osaka University. Carbon fiber targets (7μm in diameter) were irradiated with a 268nm laser light at a pulse duration of 12ps, an energy of 5J and an average irradiance of 3×1014W/cm2. Time resolved Balmer-α (18.2nm) intensity from hydrogen-like carbon ions was measured with a flat-field XUV spectrometer coupled to a streak camera. The gain in the Balmer-α transition observed at 4 mrad from the target axis showed gain after 200ps from the pump laser irradiation. Experimental results were compared with a time dependent average-atomic-model coupled with a hydrodynamic code (MEDUSA102). We take into account of effects of nonuniformity of the absorption irradiance to explain small gain observed in the experiment.

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