Abstract
We have determined experimentally a limitation for nanosecond CO2 pulse amplification at atmospheric pressure in 5:1:1 He:CO2:N2 gas mixtures. We find that the refraction effect, self-defocusing, will present difficulties both in the amplification of a nanosecond CO2 laser pulse to substantial energies and in subsequent laser fusion experiments where the laser beam is to be focused onto a target.
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