Noise propagation from pump to secondary lasers

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Abstract
Experimental measurements of the intensity fluctuations and the associated power spectra for the pump (argon) laser and the secondary (dye) laser show that the secondary laser follows pump fluctuations when operated far above threshold but acts as a low-pass filter when operated close to threshold. The experimental results are well explained by a laser model that accounts for pump fluctuations through a multiplicative colored-noise process. The theory and the experiment are in good quantitative agreement.