Photoproduction of electron-positron pairs by the strong-field Breit-Wheeler process in an intense laser field is studied. The laser field is assumed to consist of two consecutive short pulses, with a variable time delay in between. By numerical calculations within the framework of scalar quantum electrodynamics, we demonstrate that the time delay exerts a strong impact on the pair-creation probability. For the case when both pulses are identical, the effect is traced back to the relative quantum phase of the interfering S -matrix amplitudes and explained within a simplified analytical model. Conversely, when the two laser pulses differ from each other, the pair-creation probability depends not only on the time delay but, in general, also on the temporal order of the pulses.Keywords: Electron-positron pair production, short laser pulses, quantum interference 2010 MSC: 00-01, 99-00 D ⊢ ⊢ Figure 1: Scheme of the field configuration: The gamma quantum (blue) collides with two consecutive short laser pulses (red) with a variable distance D.