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The output of a laser amplifier with simultaneous amplified spontaneous emission and an injected seed

Published online by Cambridge University Press:  19 June 2009

H. Huang  and
G.J. Tallents
H. Huang
Affiliation:
Department of Physics, University of York, York, United Kingdom
G.J. Tallents*
Affiliation:
Department of Physics, University of York, York, United Kingdom
*
Address correspondence and reprint requests to: G.J. Tallents, Department of Physics, University of York, York YO10 5DD, United Kingdom. E-mail: gjt5@york.ac.uk
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Abstract

The minimum irradiance needed to overcome amplified spontaneous emission (ASE) of a seed beam injected into a laser amplifier is evaluated. The treatment is particularly applicable to extreme ultraviolet (EUV) and X-ray laser schemes to inject laser harmonic radiation as a seed into (1) plasma laser amplifiers and (2) free-electron lasers. Simple expressions and calculations are given for the minimum injected irradiance required for amplification of the injected seed beam to exceed ASE from the amplifier, including the effects of gain saturation, assuming one dimensional radiative transfer.

Keywords

Amplified spontaneous emissionFree-electron lasersHarmonic radiationSeed beamX-ray
Type
Research Article
Information
Laser and Particle Beams , Volume 27 , Issue 3 , September 2009 , pp. 393 - 398
Copyright
Copyright © Cambridge University Press 2009

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