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Coherent terahertz radiation from interaction of electron beam with rippled density plasma

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3 Author(s)
Pathak, Vishwa Bandhu ; Physics Department, Indian Institute of Technology, Delhi 110016, India ; Dahiya, D. ; Tripathi, V.K.

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An alternative free electron laser concept for producing coherent terahertz radiation is investigated. A weakly relativistic electron beam impinged on a rippled underdense plasma, at an angle to the ripple wave vector, interacts with a seed terahertz signal to produce a space charge beam mode. The oscillatory electron velocity due to the beam mode beats with the density ripple to generate a coherent electromagnetic wave in the terahertz frequency range in forward direction. For an electron beam with 5 MW power, one can obtain ∼40 kW power at 1 THz frequency.

Published in:

Journal of Applied Physics  (Volume:105 ,  Issue: 1 )