Influence of polarization effect in folded resonators on the stability of green output

The green problem in intracavity frequencydoubled laser with folded resonator was studied based on the Jones matrix and coupling wave equation methods. The polarization effect of the folded mirror was discussed and its influence on the stability of green ouput was analyzed. The calculation results were compared with the experiments. It indicates that reasonably designed folded resonator can reduce the green fluctuation more effectively than the linear resonator．