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Lasers One of the machines that I liked at the show was the laser-cutting machine I learned lasers are devices that amplify light and produce coherent light beams ranging from infrared to ultraviolet Also lasers harness atoms to store and emit light in a coherent fashion The electrons in the atoms of a laser medium are first pumped or energized 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 Light amplification is achieved as the photons move back and forth between two parallel mirrors triggering further simulated emissions The intense directional and monochromatic laser light finally leaves through one of the mirrors which is only partially silvered There are many types of lasers The solid-state lasers are the most common Solid laser media are ruby crystals and neodymium-doped glasses and crystals The ends of the rod are fashioned into two parallel surfaces coated with a highly reflection nonmetallic film Solid-state lasers offer the highest power output They are usually operated in a pulsed manner to generate a burst of light over a short time Another type of laser is gas The laser medium of a gas laser can be a pure gas a mixture of gases or even metal vapor and is usually contained in a cylindrical glass or quartz tube Two mirrors are located outside the ends of the tub to form the laser cavity Ultraviolet light electron beams electric current or chemical reactions pump gas lasers The helium-neon laser is known for it high frequency stability color purity and minimal beam spread Carbon dioxide lasers are very efficient and consequently they are the most powerful continuous wave lasers Se miconductor lasers are the most compact of lasers The semiconductor laser usually
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