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We propose a method based on the slice energy spread modulation to generatestrong subpicoseond density bunching in high-intensity relativistic electronbeams. A laser pulse with periodic intensity envelope is used to modulate theslice energy spread of the electron beam, which can then be converted intodensity modulation after a dispersive section. It is found that the double-hornslice energy distribution of the electron beam induced by the laser modulationis very effective to increase the density bunching. Since the modulation isperformed on a relativistic electron beam, the process does not suffer fromstrong space charge force or coupling between phase spaces, so that it isstraightforward to preserve the beam quality for further applications, such asterahertz (THz) radiation and resonant excitation of plasma wakefield. We showin both theory and simulations that the tunable radiation from the beam cancover the frequency range of 1-10 THz with high power and narrow-band spectra.

Generation of High-Power, Tunable Terahertz Radiation from Laser Interaction with a Relativistic Electron Beam