An experiment is described which shows that no significant variation in average electron energy is associated with changes in optical gain in a 10.6 μm laser amplifier containing CO2 mixed with N2 and He. A microwave technique for measuring the average electron energy has been developed, using a 4-mm-bore discharge tube sealed by NaCl windows and enclosed in an X-band waveguide section.
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Noon et al. (1968) studied this question.
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