Abstract
A calculation is reported of the sensitivity of the intensity of λ = 0.63μ, radiation, emitted from a helium-neon laser excited by a dc discharge, to discharge current fluctuations. The influence of simultaneous emission of λ = 3.39μ. radiation (due to a coupled transition) on this sensitivity if found for a wide range of discharge currents and current-fluctuation frequencies. It is shown that fluctuations of the intensity of the λ = 0.63μ radiation, resulting from the corresponding fluctuations of the discharge current, can be reduced considerably not only at low (0–1 kHz) fluctuation frequencies but also at a resonance'' frequency which amounts to a few tens of kilohertz. The results of these calculations are confirmed by experimental results obtained in the frequency range 0–100 kHz.
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