Characterization and stabilization of the unstable fixed points of a frequency doubled Nd:YAG laser

We demonstrate the successful stabilization of type II chaos of a multimode, intracavity frequency doubled, diode-pumped Nd:YAG (neodymium-doped yttrium aluminum garnet) laser in experiment using an adaptive proportional feedback control. The two orthogonal polarized infrared intensities are fed back to the injection current of the pump diode. The stability properties of the stabilized unstable fixed points are investigated and exploited to explain the performance of our control scheme and to determine suitable measurement signals for the feedback control.