Robust sub-50 fs cavity-laser phase stabilization for ultra-fast electron diffraction instruments
1 Department of Physics, Center for the Physics of Materials, McGill University, 3600 University Street, Montreal, Quebec, Canada H3A 2T8
2 Department of Chemistry, McGill University, 801 Sherbrooke Street W, Montreal, Quebec, Canada H3A 0B8
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Published online: 16 April 2019
A novel laser-RF cavity synchronization scheme was developed for ultrafast electron diffraction instruments. The approach directly generates a synchronized microwave tone by retrieving a phase-locked high-harmonic by photodetection. The radio-frequency cavity which performs electron pulse compression is detuning compensated using an active phase stabilization loop. Timing stability improved from 100 fs to 5 fs RMS and long-term time-zero stability improved to below our measurement resolution of 50 fs determined by pulse streaking.
© The Authors, published by EDP Sciences, 2019