If you watch detective shows on TV, every so often they will do something with LiDAR. These are generally really expensive systems that scan a crime scene and eventually produce a 3D model. Expensive in this case is like US$10k and up. There are cheaper ones in the $100 and less range for personal or hobby use. But you may already own a LiDAR system and not know it.

If you have a newer smart device that uses facial recognition then you may have a LiDAR system. The iPhone-12 has an actual LiDAR camera/laser on the front… back?… camera away from the screen… normally used for distance measuring. It is rather low resolution but also is stronger and reaches farther.

The screen side camera facing you is used for facial recognition. It is higher resolution but not as strong… meaning far-reaching.