Laser Laser A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation. The term "laser" originated as an acronym for "light amplification by stimulated emission of radiation". The first laser was built in 1960 by Theodore H. Maiman at Hughes Research Laboratories, based on theoretical work by Charles Hard Townes and Arthur Leonard Schawlow. A laser differs from other sources of light in that it emits light "coherently". Spatial coherence allows a laser to be focused to a tight spot, enabling applications such as laser cutting and lithography. Spatial
Laser tag range of ages. When compared to paintball, laser tag is painless because it uses no physical projectiles, and indoor versions may be considered less physically demanding because most indoor venues prohibit running or roughhousing. In late 1970s and early '80s, the United States Army deployed a system using infrared beams for combat training. The MILES system functions like laser tag in that beams are "fired" into receivers that score hits. Similar systems are now manufactured by several companies and used by various armed forces around the world. The first known toy to use infrared light and a corresponding sensor was