18 February 2010 A 20fs synchronization system for lasers and cavities in accelerators and FELs
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Proceedings Volume 7581, High Energy/Average Power Lasers and Intense Beam Applications IV; 75810O (2010); doi: 10.1117/12.846253
Event: SPIE LASE, 2010, San Francisco, California, United States
Abstract
A fiber-optic RF distribution system has been developed for synchronizing lasers and RF plants in short pulse FELs. Typical requirements are 50-100fs rms over time periods from 1ms to several hours. Our system amplitude modulates a CW laser signal, senses fiber length using an interferometer, and feed-forward corrects the RF phase digitally at the receiver. We demonstrate less than 15fs rms error over 12 hours, between two independent channels with a fiber path length difference of 200m and transmitting S-band RF. The system is constructed using standard telecommunications components, and uses regular telecom fiber.
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R. B. Wilcox, J. M. Byrd, L. R. Doolittle, G. Huang, J. W. Staples, "A 20fs synchronization system for lasers and cavities in accelerators and FELs", Proc. SPIE 7581, High Energy/Average Power Lasers and Intense Beam Applications IV, 75810O (18 February 2010); doi: 10.1117/12.846253; https://doi.org/10.1117/12.846253
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KEYWORDS
Receivers

Free electron lasers

Signal detection

Transmitters

Modulation

Interferometers

Continuous wave operation

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