FEL2013 - List of Authors (Gillespie, W.A.)

Paper	Title	Page
TUPSO89	A Femtosecond Resolution Electro-optic Diagnostic Using a Nanosecond-pulse Laser	447
	D.A. Walsh, W.A. Gillespie University of Dundee, Nethergate, Dundee, Scotland, United Kingdom S.P. Jamison Cockcroft Institute, Warrington, Cheshire, United Kingdom S.P. Jamison STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
	Funding: This project has been funded by CERN as part of the CLIC-UK programme Contract Number KE1865/DG/CLIC Electro-optic diagnostics with a target time resolution of 20fs RMS, and with intrinsically improved stability and reliability, are being developed. The new system is based on explicit temporal measurement of an electro-optically upconverted pulse, following interaction of the bunch with a quasi-CW probe pulse. The electro-optic effect generates an “optical-replica” of the longitudinal charge distribution from the narrow-bandwidth probe, simultaneously up-converting the bunch spectrum to optical frequencies. By using Frequency Resolved Optical Gating (FROG), an extension of autocorrelation, the optical replica can then be characterised on a femtosecond time scale. This scheme therefore bypasses the requirement for unreliable femtosecond laser systems. The high pulse energy required for single-shot pulse measurement via FROG will be produced through optical parametric amplification of the optical-replica pulses. The complete system will be based on a single nanosecond-pulse laser – resulting in a reliable system with greatly relaxed timing requirements.

Paper

Title

Page

A Femtosecond Resolution Electro-optic Diagnostic Using a Nanosecond-pulse Laser

447

D.A. Walsh, W.A. Gillespie
University of Dundee, Nethergate, Dundee, Scotland, United Kingdom
S.P. Jamison
Cockcroft Institute, Warrington, Cheshire, United Kingdom
S.P. Jamison
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom

Funding: This project has been funded by CERN as part of the CLIC-UK programme Contract Number KE1865/DG/CLIC
Electro-optic diagnostics with a target time resolution of 20fs RMS, and with intrinsically improved stability and reliability, are being developed. The new system is based on explicit temporal measurement of an electro-optically upconverted pulse, following interaction of the bunch with a quasi-CW probe pulse. The electro-optic effect generates an “optical-replica” of the longitudinal charge distribution from the narrow-bandwidth probe, simultaneously up-converting the bunch spectrum to optical frequencies. By using Frequency Resolved Optical Gating (FROG), an extension of autocorrelation, the optical replica can then be characterised on a femtosecond time scale. This scheme therefore bypasses the requirement for unreliable femtosecond laser systems. The high pulse energy required for single-shot pulse measurement via FROG will be produced through optical parametric amplification of the optical-replica pulses. The complete system will be based on a single nanosecond-pulse laser – resulting in a reliable system with greatly relaxed timing requirements.