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Proceedings Paper

Improving the efficiency of x-ray lasers
Author(s): Gregory J. Tallents; Philippe Zeitoun; A. Behjat; A. Demir; M. Holden; J. Krishnan; Ciaran L. S. Lewis; Andrew G. MacPhee; P. J. Warwick; Marc Nantel; Gerard Jamelot; Bedrich Rus; Pierre Jaegle; Annie Klisnick; P. Goedtkindt; Antoine Carillon; Ernst E. Fill; Yuelin Li; Georg Pretzler; Dieter Schloegl; Juergen Steingruber; David Neely; Peter A. Norreys; Michael H. Key; Jie Zhang; Geoffrey J. Pert; S. B. Healy; J. A. Plowes
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Paper Abstract

Current successful approaches for achieving soft x-ray lasing typically require pumping laser pulses of duration approximately ns and energy approximately kJ (collisionally pumped schemes) or approximately ps pulses and powers of approximately several TW (recombination-pumped schemes). For applications, it is important to improve the efficiency of soft x-ray lasers and so reduce the required power of pumping lasers. The effect of pre- pulse on neon-like collisionally pumped lasers has been investigated using the LULI laser (Ecole Polytechnique, France). A small pre-pulse level approximately 10-3 of the main pulse energy was found to increase the J equals 0 minus 1 neon-like zinc laser output at 21 nm by an order-of-magnitude with a comparable increase in efficiency. A double pumping laser pulse on neon-like yttrium lasing output at 15 nm obtained with the VULCAN laser (Rutherford Appleton Laboratory, England) was also found to increase the x-ray lasing efficiency. With adiabatically cooled recombination lasing, it is shown that approximately 2 ps pulses are optimum for achieving the desired ionization balance for lasing output. The possibility of achieving recombination lasing at short wavelengths on lithium-like ions with longer pulse lasers has been investigated using the ASTERIX laser (Max-Planck Quantenoptik, Germany). These results are presented and interpreted to provide possible directions for improving the efficiency of x-ray lasers.

Paper Details

Date Published: 25 September 1995
PDF: 11 pages
Proc. SPIE 2520, Soft X-Ray Lasers and Applications, (25 September 1995);
Show Author Affiliations
Gregory J. Tallents, Univ. of Essex (United Kingdom)
Philippe Zeitoun, Univ. of Essex (United Kingdom)
A. Behjat, Univ. of Essex (United Kingdom)
A. Demir, Univ. of Essex (United Kingdom)
M. Holden, Univ. of Essex (United Kingdom)
J. Krishnan, Univ. of Essex (United Kingdom)
Ciaran L. S. Lewis, Queen's Univ. of Belfast (United Kingdom)
Andrew G. MacPhee, Queen's Univ. of Belfast (United Kingdom)
P. J. Warwick, Queen's Univ. of Belfast (United Kingdom)
Marc Nantel, Univ. de Paris-Sud (France)
Gerard Jamelot, Univ. de Paris-Sud (France)
Bedrich Rus, Univ. de Paris-Sud (France)
Pierre Jaegle, Univ. de Paris-Sud (France)
Annie Klisnick, Univ. de Paris-Sud (France)
P. Goedtkindt, Univ. de Paris-Sud (France)
Antoine Carillon, Univ. de Paris-Sud (France)
Ernst E. Fill, Max-Planck-Institut fuer Quantenoptik (Germany)
Yuelin Li, Max-Planck-Institut fuer Quantenoptik (Germany)
Georg Pretzler, Max-Planck-Institut fuer Quantenoptik (Germany)
Dieter Schloegl, Max-Planck-Institut fuer Quantenoptik (Germany)
Juergen Steingruber, Max-Planck-Institut fuer Quantenoptik (Germany)
David Neely, Rutherford Appleton Lab. (United Kingdom)
Peter A. Norreys, Rutherford Appleton Lab. (United Kingdom)
Michael H. Key, Rutherford Appleton Lab. (United Kingdom)
Jie Zhang, Univ. of Oxford (United Kingdom)
Geoffrey J. Pert, Univ. of York (United Kingdom)
S. B. Healy, Univ. of York (United Kingdom)
J. A. Plowes, Univ. of York (United Kingdom)

Published in SPIE Proceedings Vol. 2520:
Soft X-Ray Lasers and Applications
Jorge J. G. Rocca; Peter L. Hagelstein, Editor(s)

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