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We demonstrate sub-100-attosecond timing jitter optical pulse trainsgenerated from free-running, 77.6-MHz repetition-rate, mode-locked Er-fiberlasers. At -0.002(\pm0.001) ps2 net cavity dispersion, the rms timing jitter is70 as (224 as) integrated from 10 kHz (1 kHz) to 38.8 MHz offset frequency,when measured by a 24-as-resolution balanced optical cross-correlator. To ourknowledge, this result corresponds to the lowest rms timing jitter measuredfrom any mode-locked fiber lasers so far. The measured result also agreesfairly well with the Namiki-Haus analytic model of quantum-limited timingjitter in stretched-pulse fiber lasers.

Sub-100-as timing jitter optical pulse trains from mode-locked Er-fiber lasers