Spatially resolved gain measurements at 10.6μ have been made transverse to the discharge in an axially flowing CO2 laser amplifier. These show a nonuniform gain throughout the discharge with maximum gain at the upstream end of the positive column. Increasing the flow velocity shifts the gain profile and leads to an over-all increase in gain. Spatial intensity profiles of the sidelight emission of CO2 at 4.3μ, CO at 0.48 and 2.3 μ, and N2 at 3371 Å are shown.
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McQuillan et al. (1970) studied this question.
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