Scaling theory of laser radiation in the transient unstable region

The general scaling theory of transient phenomena near the instability point proposed by one of the authors (M.S.) is applied to analyze the transient behavior of laser radiation from the unstable state (i.e., no photon at the initial time). The analytic results thus obtained by the scaling theory agree very well with the experimental results on the laser intensity and its fluctuation obtained by Arecchi and Degiogio. This gives a nice example of the general fluctuation-enhancement theorem proved by the scaling theory.