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Three gain saturation laws are frequently used to describe the light energy propagation in laser amplifiers: two assigned to Rigrod, referring to homogeneous and inhomogeneous laser line. The third assigned to Frantz-Nodvick law. We show that under lossless medium conditions, and for both small signal and saturation regimes the laws can be presented uniformly as: Yout equals Yin(DOT)exp(go(DOT)L) where Y is a function of the normalized intensity I, which is the ratio of light intensity to saturation light intensity. The saturation intensity and the dependence of Y on I are different for each of the laws, but for all cases Y approaches I in the small-signal regime. We provide approximate analytical expressions, for the inverse function I(Y) for the two Rigrod laws, facilitating a one-step integration of the gain saturation laws.© (1993) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only. |
