We have investigated the properties of light emitted into the nearest subthreshold mode on either side of the single lasing mode of an argon-ion laser. This light beats with the laser line and hence contributes to the laser's intensity-fluctuation noise spectrum over a range of frequencies centered close to the longitudinal mode separation. The noise contribution from one subthreshold mode is shown to be strongly anticorrelated with that from the other, leading to optical noise cancellation.
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Harris et al. (1992) studied this question.
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