Abstract

Coherent synthesis from independent femtosecond lasers [1] is an extremely promising approach for the generation of single-cycle pulses, arbitrary optical waveform generation, and remote optical frequency comb distribution. At the same time, this method has been found to present tremendous challenges, since the detection and stabilization of both the relative timing jitter and carrier envelope phase (CEP) jitter up to attosecond precision is an essential prerequisite. Utilizing balanced optical cross-correlation (BOC) based pulse synchronization and feed-forward CEP stabilization [2], coherent synthesis in the single-cycle regime has been demonstrated in [3]. Here, we demonstrate tight synchronization and phase-locking between two femtosecond fiber lasers. This scheme may enable remote optical frequency comb distribution, i.e., simultaneous microwave and optical frequency references transfer via an optical free space link.

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