Following some fortunate measurements made by the author it was discovered that rather than a continuous discharge, the system was in fact operating in a semi-stable pulsing regime with a strong mid-IR afterglow light pulse. This led to measurements with a more favourable signal-to-noise ratio, and so a simpler alignment.
Love, A., 2018. Pulsed Measurements of the He-Xe Laser. In Hollow Core Optical Fibre Based Gas Discharge Laser Systems (pp. 73-89). Springer, Cham.
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