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Photopumping of XUV lasers by XFEL radiation

Published online by Cambridge University Press:  01 July 2004

KE LAN ,
ERNST FILL  and
JÜRGEN MEYER-TER-VEHN
KE LAN
Affiliation:
Max-Planck-Institut für Quantenoptik, D-85748 Garching, Germany
ERNST FILL
Affiliation:
Max-Planck-Institut für Quantenoptik, D-85748 Garching, Germany
JÜRGEN MEYER-TER-VEHN
Affiliation:
Max-Planck-Institut für Quantenoptik, D-85748 Garching, Germany
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Abstract

Within the next few years X-ray free-electron lasers (XFELs) now under construction are expected to generate highly collimated XUV pulses with 1013 photons and a duration of 100 fs. Focusing this radiation to a spot some 10 μm in diameter generates intensities of up to 1016 W/cm2. Such pump intensities make feasible the investigation of photopumped XUV lasers using this radiation. We present simulations taking into account two different mechanisms generating the gain: (1) photoionization with subsequent three-body recombination, which takes advantage of the monochromaticity of the pump radiation to generate very cold electrons; (2) inner-shell ionization in which transient inversion is obtained by generating a hole in an otherwise completely filled shell. The simulations show that under appropriate conditions both mechanisms generate very high gain. However, a number of further issues must be considered, such as the propagation of the pump pulse in the medium to be pumped.

Keywords

PhotopumpingX-ray free-electron laserX-ray laser
Type
Research Article
Information
Laser and Particle Beams , Volume 22 , Issue 3 , July 2004 , pp. 261 - 266
Copyright
© 2004 Cambridge University Press

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