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Femtosecond mode-locked fiber lasers have been actively employed in many practical applications such as micro-machining, corneal surgery and multi-photon imaging, thanks to their compactness, alignment-free operation, and low cost. To enhance the long-term stability and self-starting operation of mode-locked lasers, saturable absorber (SA) devices, such as semiconductor saturable absorber mirrors...
We fabricate saturable absorbers and WDM/tap hybrid couplers using standard planar lightwave circuit (PLC) fabrication processes. The fabricated PLC devices are applied to modelocked all-fiber lasers, which show long-term stable and self-starting operation.
We demonstrate sub-100-attosecond-resolution time-of-flight stabilization method for optical pulse trains in atmospheric links. The rms excess fluctuation in timing for 76.2-m-long indoor free-space transfer is suppressed from >230 fs to 2.6 fs over 130-hour.
We show an all-planar, fiber-connected CNT saturable absorber manufactured by the planar lightwave circuit (PLC) process. The fabricated saturable absorber was successfully employed in an all-fiber soliton mode-locked Er-laser.
We searched for the minimal timing jitter condition in an all-fiber, soliton, CNT-mode-locked Er-laser by dispersion engineering. The measured lowest timing jitter is 490-attosecond [10-kHz to 39.4-MHz] at −0.02 ps2 intra-cavity dispersion.
We show 1.13-GHz repetition rate, 0.70-fs timing jitter optical pulse train directly generated from diode-pumped, CNT-mode-locked Yb:KYW laser. The measured jitter is the lowest for GHz pulse trains, and is suitable for high-resolution analog-to-digital conversion.
We demonstrate 14.3-attosecond timing jitter [integrated from 10 kHz to 94 MHz offset frequency] optical pulse trains from 188-MHz repetition-rate mode-locked Yb-fiber lasers. In order to minimize the timing jitter, we shorten the non-gain fiber length to shorten the pulsewidth and reduce excessive higher-order nonlinearity and nonlinear chirp in the fiber laser. The measured jitter spectrum is limited...
We demonstrate a 1.2-GHz repetition rate, diode-pumped carbon nanotube (CNT)-mode-locked Yb:KYW laser with 168 fs pulse duration. To our knowledge, this corresponds to the highest repetition rate from CNT-mode-locked femtosecond bulk solid-state lasers.
We demonstrate 18-attosecond timing jitter [10 kHz–94 MHz] pulse trains from 188MHz mode-locked Yb-fiber lasers. This is the lowest timing jitter from free-running fiber lasers, comparable to the performance of lowest-jitter Ti:sapphire lasers.
We demonstrate optical pulse trains with sub-100-attosecond high-frequency timing jitter from passively mode-locked, stretched-pulse fiber lasers by operating the lasers at the close-to-zero net cavity dispersion.
We characterize the excess timing noise in the 21.6 m-long indoor atmospheric transfer with 184-as resolution and suppress the drift in time-of-flight from 85 fs to 4 fs using the balanced optical cross-correlation method.
We demonstrate ultra-low timing and intensity noise from mode-locked Yb-fiber lasers. The measured rms timing jitter and relative intensity noise are 187 attoseconds and 0.057 %, respectively, integrated from 10 kHz to 40 MHz.
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