helium-neon laser
Quick Summary
A helium-neon laser is a type of gas laser that uses a mixture of helium and neon as its active medium. Helium atoms capture energy from passing electrons and transfer it to neon atoms, which then emit light. These lasers are known for producing a visible red beam, though they can also emit yellow, orange, green, or infrared light. Typical powers for helium-neon lasers are in the milliwatt range. They were among the first lasers to find broad commercial applications, particularly for projecting straight lines in alignment, surveying, and construction.12
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