Theory of mode-locked intracavity second-harmonic generation in a ring laser.

We model the dynamics of a Q-switched mode-locked intracavity second-harmonic-generation (SHG) ring laser. Numerical studies show that a long train of constant-pulse-duration short pulses at the second-harmonic and fundamental frequencies result. The efficiency of the mode-locked intracavity SHG laser is comparable with that of the mode-locked fundamental-frequency laser not containing SHG.