Total intensity of a three-mode laser under mode-locked conditions

A numerical analysis of the three-mode Lamb model of an He–Ne laser operating under mode-locked conditions is used to show that there is a spectrally narrow singularity in the dependence of the total intensity on the mode frequency. The position of this singularity coincides with the center of the line due to the active transition. The calculated parameters of the effect at λ = 0.63 μ indicate that it can be used in frequency stabilization.