Field Transients Of Coherent Terahertz Synchrotron Radiation Accessed Via Time-Resolving And Correlation Techniques
JOURNAL OF APPLIED PHYSICS(2016)
Abstract
Decaying oscillations of the electric field in repetitive pulses of coherent synchrotron radiation in the terahertz frequency range was evaluated by means of time-resolving and correlation techniques. Comparative analysis of real-time voltage transients of the electrical response and interferograms, which were obtained with an ultrafast zero-bias Schottky diode detector and a Martin-Puplett interferometer, delivers close values of the pulse duration. Consistent results were obtained via the correlation technique with a pair of Golay Cell detectors and a pair of resonant polarisation-sensitive superconducting detectors integrated on one chip. The duration of terahertz synchrotron pulses does not closely correlate with the duration of single-cycle electric field expected for the varying size of electron bunches. We largely attribute the difference to the charge density oscillations in electron bunches and to the low-frequency spectral cut-off imposed by both the synchrotron beam-line and the coupling optics of our detectors. (C) 2016 AIP Publishing LLC.
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Key words
coherent terahertz synchrotron radiation,synchrotron radiation,field transients,time-resolving
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