Recently it has been demonstrated that intracavity second harmonic generation (SHG) in a Nd:YAG laser can lead to mode locking with pulse durations of ≃ 100 ps at 532 nm.1,2 Ohter work has shown that nonlinear processes in an external coupled cavity can effectively mode lock a laser.3,4 These two mechanisms are combined to mode look a Nd:YAG laser using SHG as the nonlinearity.

© 1989 Optical Society of America

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