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Two-photon pulsed terahertz (THz) emission from a GaAs/AlAs double-barrier resonant tunneling diode biased into regime of self-oscillations of current has been detected. The two THz pulses are triggered at two critical points in period of current self-oscillations due to the periodic process of charge accumulation and drain in quantum well. The internal mechanism of relaxation self-oscillations, which controls the trapping and release time of electrons tunneling through the miniband, is responsible for the time de...