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Opt Lett. 2014 Sep 15;39(18):5325-8. doi: 10.1364/OL.39.005325.

Remote two-color optical-to-optical synchronization between two passively mode-locked lasers.

Optics letters

H Li, L-J Chen, H P H Cheng, J E May, S Smith, K Muehlig, A Uttamadoss, J C Frisch, A R Fry, F X Kärtner, P H Bucksbaum

PMID: 26466262 DOI: 10.1364/OL.39.005325

Abstract

Using balanced detection in both the radio frequency (RF) and the optical domain, we remotely synchronize the repetition rate of a Ti:sapphire oscillator to an Er-doped fiber oscillator through a 360 m length-stabilized dispersion compensated fiber link. The drift between these two optical oscillators is 3.3 fs root mean square (rms) over 24 hours. The 68 MHz Er-doped fiber oscillator is locked to a 476 MHz local RF reference clock, and serves as a master clock to distribute 10 fs-level timing signals through stabilized fiber links. This steady remote two-color optical-to-optical synchronization is an important step toward an integrated femtosecond fiber timing distribution system for free-electron lasers (FELs); it does not require x-ray pulses, and it makes sub-10-fs optical/x-ray pump-probe experiments feasible.

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