Optical_Lasers

Optical Lasers I am doing my report on lasers. Laser, acronym for light amplification by stimulated emission of radiation. Lasers are devices that amplify light and produce coherent light beams, ranging from infrared to ultraviolet. A light beam is coherent when its waves, or photons, propagate in step with one another. Laser light, therefore, can be made extremely intense, highly directional, and very pure in color. Laser devices now extend into the X-ray frequency range. This is the Principles of Operation. Lasers bind atoms to store and give out light in a coherent fashion. The electrons in the atoms of a laser medium are first pumped to an excited state by an energy source. They are then stimulated by external photons to emit the stored energy in the form of photons, a process known as stimulated emission. The photons emitted have a frequency characteristic of the atoms and travel in step with the stimulating photons. These photons in turn impinge, or invade on other excited atoms to release more photons. Light amplification is achieved as the photons move back and forth between two parallel mirrors, triggering further stimulated emissions. The intense, directional, and monochromatic laser light finally leaves through one of the mirrors, laser, lasers, light, been, beams, photons, frequency, semiconductor, gas, developed, atoms, pumped, american, very, two, stimulated, small, short, physicist, first, dye, common, achieved, working, tunable, techniques, solid, principles, precise, powerful, patent, over, mode