We demonstrate 14.3-attosecond timing jitter [integrated from 10 kHz to 94MHz offset frequency] optical pulse trains from 188-MHz repetition-ratemode-locked Yb-fiber lasers. In order to minimize the timing jitter, we shortenthe non-gain fiber length to shorten the pulsewidth and reduce excessivehigher-order nonlinearity and nonlinear chirp in the fiber laser. The measuredjitter spectrum is limited by the amplified spontaneous emission limitedquantum noise in the 100 kHz - 1 MHz offset frequency range, while it waslimited by the relative intensity noise-converted jitter in the lower offsetfrequency range. This intrinsically low timing jitter enablessub-100-attosecond synchronization between the two mode-locked Yb-fiber lasersover the full Nyquist frequency with a modest 10-kHz locking bandwidth. Thedemonstrated performance is the lowest timing jitter measured from anyfree-running mode-locked fiber lasers, comparable to the performance of thelowest-jitter Ti:sapphire solid-state lasers.
展开▼
