Abstract: A light detection and ranging (LIDAR) includes: a light-emitting unit, a light receiving unit and a control unit. In the light emitting unit, first light from a first light source, after being reflected by a first surface of a first mirror, reaches the scan unit. In the light emitting unit, second light from a second light source, after being reflected by a second mirror and transmitted through the first mirror via a second surface of the first mirror, reaches the scan unit, using an overlapping path with the first light. Light intensity of the second light transmitted through the first mirror is lower than that of the first light reflected by the first mirror. The control unit enables only the first light source, and in response to determining that measurements from the light receiving unit are saturated, automatically switches off the first light source and enable the second light source.

Abstract: A laser radar system includes: a light-emitting unit including a light source, and a scanning unit configured to reflect light from the light source with a controllable deflection angle, so as to scan a target object; a light-receiving unit configured to receive light reflected from the target object and outputting a detection value, wherein a light path by which light emitted from the light-emitting unit arrives at the target object is non-coaxial with a light path by which the light reflected from the target object arrives at the light-receiving unit. The laser radar system can reduce a problem where a single photon avalanche diode (SPAD) detector cannot eliminate a dark count, precisely measure distance information of a surrounding three-dimensional spatial environment, and substantially suppress influence of background light and other stray light, thereby realizing quick and efficient modulation of spatial light.