10-fs-level synchronization of photocathode laser with RF-oscillator for ultrafast electron and X-ray sources

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Ultrafast electron-based coherent radiation sources, such as free-electron lasers (FELs), ultrafast electron diffraction (UED) and Thomson-scattering sources, are becoming more important sources in today's ultrafast science. Photocathode laser is an indispensable common subsystem in these sources that generates ultrafast electron pulses. To fully exploit the potentials of these sources, especially for pump-probe experiments, it is important to achieve high-precision synchronization between the photocathode laser and radio-frequency (RF) sources that manipulate electron pulses. So far, most of precision laser-RF synchronization has been achieved by using specially designed low-noise Er-fibre lasers at telecommunication wavelength. Here we show a modular method that achieves long-term (>1 day) stable 10-fs-level synchronization between a commercial 79.33-MHz Ti:sapphire laser oscillator and an S-band (2.856-GHz) RF oscillator. This is an important first step toward a photocathode laser-based femtosecond RF timing and synchronization system that is suitable for various small-to mid-scale ultrafast X-ray and electron sources.
Publisher
NATURE PUBLISHING GROUP
Issue Date
2017-01
Language
English
Article Type
Article
Keywords

MICROWAVE PHASE-DETECTORS; TIMING JITTER; FIBER LASERS; FREQUENCY; SUPPRESSION; INSTABILITY; AMPLIFIER; DRIFT

Citation

SCIENTIFIC REPORTS, v.7

ISSN
2045-2322
DOI
10.1038/srep39966
URI
http://hdl.handle.net/10203/220452
Appears in Collection
ME-Journal Papers(저널논문)
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[2017 Scientific Reports] 10-fs-level synchronization of photocathode laser with RF-oscillator for ultrafast electron and X-ray sources.pdf(913.81 kB)Download
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