Observation of frequency-locked coherent terahertz Smith-Purcell radiation.

  title={Observation of frequency-locked coherent terahertz Smith-Purcell radiation.},
  author={S. E. Korbly and Amit S. Kesar and J. R. Sirigiri and Richard J. Temkin},
  journal={Physical review letters},
  volume={94 5},
We report the observation of enhanced coherent Smith-Purcell radiation (SPR) at terahertz (THz) frequencies from a train of picosecond bunches of 15 MeV electrons passing above a grating. SPR is more intense than other sources, such as transition radiation, by a factor of Ng, the number of grating periods. For electron bunches that are short compared with the radiation wavelength, coherent emission occurs, enhanced by a factor of Ne, the number of electrons in the bunch. The electron beam… CONTINUE READING
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