Laser beam system and lidar

A lidar comprising:

• a laser beam system comprising:
• a light source for emitting a source laser beam;
• at least one scanning galvanometer on a light path of the source laser beam, wherein the at least one scanning galvanometer configured to project at least a part of the source laser beam to a target object, the at least a part of the source laser beam reflected by the target object is defined as detection light, and the at least one scanning galvanometer is configured to guide the detection light, the detection light and the at least a part of the source laser beam sharing the light path;
• a detector on a light path of the detection light, the detector configured to receive the detection light from the at least one scanning galvanometer and generate and output detection signals according to the detection light;
• and
• a controller electrically connected to the light source and the detector, the controller configured to receive the detection signals and to obtain information of the target object according to the detection signals;
• and
• a display for receiving the information and displaying images according to the information from the controller.