We have investigated spontaneous emissions from a two-level atom embedded in a photonic crystal with three-dimensional dispersion relation as well as interacted with a coherent intense low-frequency field. Due to this field, additional decay channels with exchange of one low-frequency photon during an atomic transition are created, resulting in the spontaneously induced quantum interference. The spontaneous emission can be suppressed significantly because of the combinational influences of the quantum interference effect and the band edge effect. The population in the upper levels depends on t...
