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LASER (Light Amplification by Stimulated Emission of Radiation) is an optical device, which emits monochromatic, directional, and coherent light beam (laser light). Commonly used in distance measuring devices such as LIDAR.

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A 3D laser range finder or LIDAR such as the one on the Google Car is far more expensive than a camera. The other reason is that while in case of a LIDAR the distance of every pixel is available, the …
answered Oct 3 '16 by Bence Kaulics