FIELD: optical-mechanical scanning devices. SUBSTANCE: device has IR laser 1, collimator 2, two mirrors 3 and 4, two scanning tetrahedral mirror prisms 5 and 7, two extra-axial parabolic mirrors 8 and 9 disposed from both sides of the second scanning prism 7, trihedral mirror prism 10. Radiation after being reflected from prism 7 is focused by parabolic mirrors 8 and 9 onto surface of focon 11 and enters then avalanche photodiode 12. EFFECT: increased range of operation; improved s/n ratio. 3 dwg
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