An experiment on detecting the influence of THz irradiation on coherent resonant electron tunneling through a short superlattice in an electric field is proposed. It is numerically shown that transmission via the upper levels of the lowest miniband, being suppressed down to the valuesT=10−2–10−1by applied voltage, is restored toT∼1by the THz field of certain amplitudes and frequencies. This is caused by electron delocalization due to stimulated multi-quantum transitions to the levels close to the center of the miniband. Thus, amplification of incident irradiation and higher-harmonics generation are possible. ©1997 American Institute of Physics.