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seed beam

Laser and Particle Beams (1)

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The output of a laser amplifier with simultaneous amplified spontaneous emission and an injected seed
H. Huang, G.J. Tallents
Journal:

Laser and Particle Beams / Volume 27 / Issue 3 / September 2009

Published online by Cambridge University Press:

19 June 2009, pp. 393-398
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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.