Abstract: A device for detecting the presence and direction of a pulsating or intensity-modulated laser radiation, in which the direction of radiation is exactly determined measures time intervals. A system with two detector elements is provided, with the first element producing a starting signal immediately when the laser radiation is incident, and the second element producing a stop signal which is delayed in time relative thereto. The second detector element is connected to a plurality of unequally long optical delay lines, each coupled to an optical collecting aperture having a specific orientation and a limited field of sight, with the individual fields of sight overlapping one another.