How do Lasers Work?
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by: chrissturat
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Laser technology is widely used today. It can be found in so many things such as CD players, high-speed metal cutting machines, hair replacement surgery, eye surgery and much more. A very simple application of laser is the use of the laser based bar code scanners that reads the bar code of a product when it is billed, thus removing the need for putting pricing labels on the product. In its most complex application, lasers can actually cut through metal and even weld it, at tremendously high speed, thus making such process all the more easier and quicker to accomplish. The most common types of lasers seen today are helium-neon lasers, argon lasers, solid state lasers and semiconductor lasers. The design of a laser device is pretty simple. It has a long tube that contains within it lasing material. This lasing material can be made from different types elements such as helium, xenon, rubies and so on. There are two mirrors located in either end of the material. One mirror will have a hole in it that is used for concentrating the laser light. The tube has a flash tube over it that sends out high density light. The laser light is emitted when the flash tube is switched on. This action sends out photons which hit the laser's lasing material. The photons pass on energy to the electrons and agitate the electrons. The resulting process creates more photons. The photons move excitedly through the tube area and as they do this, they bounce off the tube's mirrors and in the process generate a lot of electrons. These electrons generate energy of their own and this whole process continues as long as energy enters the lasing material of the laser device. When the energy passes through the small hole located in one end of the tube, what comes out is laser light.
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