Abstract

We have proposed and implemented a scheme for passive all-optical synchronization between erbium and ytterbium mode-locked fiber lasers. The passive locking of repetition rates for the dual-color pulses was realized by cross-phase modulation within phase-biased nonlinear amplifying loop mirrors. In contrast to previous demonstrations, the synchronization system was configured in an all-polarization-maintaining structure, thus gaining substantially improved stability and robustness. Consequently, the maximum tolerance of a cavity-length mismatch of 16.2 mm was achieved unprecedentedly, which was at least one order of magnitude longer than previously reported results for comparable temporal durations of involved pulses. The corresponding relative timing jitter was measured to be 31 fs within a 1 MHz bandwidth. Such a tight and robust synchronization fiber laser system offers great potential for various applications such as pump-probe microscopy, Raman scattering spectroscopy, and nonlinear frequency generation.

© 2019 Optical Society of America

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