Previous theoretical and experimental studies have shown that a nonlinear external cavity can dramatically enhance mode-locked operation.1-4 The pulse shortening mechanism occurs by the coherent addition of self-phase modulated pulses from the external cavity and has been termed additive pulse mode-locking (APM).3 One drawback in previous systems was that active mode-locking was required to initiate the short pulse operation.

© 1990 Optical Society of America

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