Gas Laser with Saturable Absorber. II. Single-Mode Stability

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Abstract
This paper determines the stability of single-mode operation of a laser with an intracavity absorber. The strong-signal theory for one mode is taken from the previous paper, and the linear response at a different cavity mode is calculated. When its gain exceeds the losses, the chosen operating point is unstable. This determines the regions of stability. The influence of the intensity and position of the strong mode is determined in the rate-equation approximation (REA). The REA is found to follow the exact results rather poorly and an improved approximation (IREA) is given, which at least qualitatively reproduces the structure of the exact gain functions.