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A new mechanism for the THz light amplification is identified inanon-resonant Raman scattering between the THz light and a visible light lasers.The non-resonant scattering normally does not exchange the energy between E \&Mfields, but the presence of the plasma density gradientcreates an condition inwhich a visible light laser could transfer its energy into a tera-hertz (THz)light via the laser-plasma interaction. The gain per length could reach 100(1000) per centimeter for the THz light (far infra-red light) amplification.

THz light amplification by an visible light laser in the presence of the plasma density gradient