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The Argus Nd:glass laser system, presently operating as an experimental facility for laser fusion experiments, is described. The laser consists of a master oscillator and two identical amplifier chains, each of 20-cm output aperture. Argus is presently capable of delivering more than 4 TW of power in short (<100-psec) pulses, or more than 2 kJ of energy in 1-nsec pulses, to 100-microm targets. Short pulse performance enhancement obtained by increased aperture filling and implementation of image relaying with high power vacuum spatial filters is described. Experimentally recorded near-field and far-field data for several power levels are presented and discussed in terms of the limiting effects of nonlinear beam instabilities upon focal spot intensity.
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Simmons et al. (1978) studied this question.
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