  Intracavity frequency-doubled solid-state lasers exhibit intensity
fluctuations of their light output, which are cause by nonlinear dynamical
processes. Up to now, there are different solutions to this problem, but they
reduce the output power, increase the size of the laser and/or make them more
complicated to assemble. One focus of current research in nonlinear dynamics is
derivation of control strategies from mathematical models and their
experimental realization. We suggest a method to stabilize the output power by
means of an electronic feedback of the emitted infrared light intensity to the
pump power. First we show the theoretical predictions of a recently published
stability analysis of a rate equation model with feedback. The presented
experimental observation show systematic deviations from theory. This makes it
necessary to refine the model to explain the deviations. The refinement has
direct impact on the improvement of the feedback loop and, therefore, on the
application of such a control scheme.
