Laser (whose acronym in English means Light Amplification by stimulated Emission of Radiation, or the Light Amplification by stimulated emission of radiation) is a device that produces electromagnetic radiation with very special characteristics: it is monochromatic (frequency is well defined) and coherent (the phase relationship is well defined), and is collimated (propagates as a beam).


For its special properties, the laser is now used in several applications: medical (surgery), the physical rehabilitation and anti-inflammatory, analgesic and regeneration, industrial (metal cutting, measure distances), research (optical tweezers, water, physical atomic, quantum optics, cooling clouds of atomic, quantum information), commercial (for optical fiber communication, bar code readers), and even every day in our homes (units of CD and DVD players, laser pointer used in presentations with projectors).


In industrial use, the laser CO2 (carbon dioxide) is becoming increasingly being used, is now essential. Very competitive to be a rapid process for cutting and welding of various materials with great speed due to usin