Laser

A laser (light amplification by stimulated emission of radiation) is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation.

A laser emits coherent light allowing focus to a spot, enabling applications such as laser cutting and lithography. Spatial coherence also allows a laser beam to stay narrow over great distances, enabling laser pointers and lidar.

Lasers are used in optical disc drives, laser printers, barcode scanners, fiber-optics and optical communication, laser surgery, cutting and welding materials, marking targets and measuring range and speed, laser lighting displays for entertainment, and weaponry.