FIELD: armaments, in particular, proximity fuses of various ammunition actuated by radiation of optical band. SUBSTANCE: laser unit has a source of optical radiation, collimating and focussing lenses, and a photodetector, it is provided with an optical radiation beam- splitting system, light filter and one more photodetector. The beam-splitting system is positioned behind the collimating lens, and the light filter is installed between the focussing lens and the photodetector. EFFECT: enhanced probability of detection of small-sized targets, enhanced accuracy of setting of preset range of actuation, enhanced protection against optical interference. 3 cl, 4 dwg
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