Theoretical and experimental studies of noise suppression for intracavity frequency doubled lasers with phase matching type I or II

A general physical model consisting of two arbitrary birefringent elements is presented and studied based on Jones matrix calculation. The resonant frequencies and polarization directions of the two kinds of fundamental wave eigenmodes are given in general case. The stability of the intracavity frequency doubled cw laser emission is analyzed under multi-longitudinal modes operation. The conditions for noise suppression of the second harmonic output are derived for both types of phase matching. Experiment results are in good agreement with the theoretical analyses. (C) 2001 Elsevier Science B.V. All rights reserved.