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Gas lasers are a type of laser that rely on a gas mixture to produce the stimulated emission of radiation. They are often used for high-power industrial applications such as cutting, welding, and drilling, as well as for scientific research, medical procedures, and even entertainment. The most commonly used gas lasers are carbon dioxide (CO2) lasers, helium-neon (HeNe) lasers, and argon-ion (Ar-ion) lasers. Each type of gas laser has its own unique properties and characteristics, making them suitable for specific applications. For example, CO2 lasers are known for their high power and long wavelengths, making them ideal for cutting and welding thick materials, while HeNe lasers are used for alignment and positioning in precision scientific and medical instruments. Gas lasers continue to be an important tool in many industries and fields, thanks to their versatility and reliability.