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A new type of the THz laser is proposed. A coherent tera-hertz light isemitted through the backward Raman scattering between a visible light laser anda relativistic electron beam. The threshold conditions for the laser intensityand the electron beam density are identified. The scheme may lead to one of themost intense tera-hertz coherent light sources.

Backward Raman scattering in a relativistic electron beam and intense THz light