FIELD: optical instrumentation engineering. SUBSTANCE: proposed photodetector has flat- spherical objective manufactured in the form of one lens, mirror coats facing radiation with mirror surface are deposited on to flat and spherical surfaces of it from outside. Spherical surface of lens has window on optical axis behind which photosensitive element is positioned. Photodetector may include second photosensitive element and mirror or radiation source. In this case mirror coat on spherical surface of lens can be made semitransparent or dichroic. EFFECT: enhanced functional efficiency and reliability of photodetector. 2 cl, 4 dwg
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