A helium–neon laser or HeNe laser, is a type of gas laser whose gain medium consists of a mixture of helium and neon(10:1) inside of a small bore capillary tube, usually excited by a DC electrical discharge. The pressure inside the tube is 1 mm of Hg. The best-known and most widely used HeNe laser operates at a wavelength of 632.8 nm in the red ...
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http://en.wikipedia.org/wiki/Helium–neon_laser
(from the article `laser`) Helium-neon lasers were the first lasers with broad commercial applications ( figure). Because they could be adjusted to generate a visible red beam ...
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http://www.britannica.com/eb/a-z/h/33
A type of laser commonly used in barcode scanners. It emits coherent red light at a wavelength of 633 nanometers..
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http://www.encyclo.co.uk/visitor-contributions.php
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