Coherent lidar apparatus including light frequency stabilization apparatus based on complex opll

Abstract

A LiDAR apparatus may include a first light source configured to output light for detecting a distance up to a target, a second light source configured to output light for detecting the speed of the target, a third light source configured to output light for detecting the directivity of the target moving, a light combination unit configured to combine the pieces of light radiated by the first to third light sources, an optical system configured to adjust the path or state of light to be output to the outside or reflected light reflected by the target, an interferometer configured to receive the combined light and the reflected light and to make the combined light and the reflected light interfere with each other, and a detection unit configured to detect information on the distance and speed of the target by receiving the light subjected to the interference.