A helium–neon laser or He-Ne laser, is a type of gas laser whose high energetic medium gain medium consists of a mixture of 10:1 ratio of helium and neon at a total pressure of about 1 torr inside of a small electrical discharge. The best-known and most widely used He-Ne laser operates at a wavelength of 632.8 nm, in the red part of the visible spectrum.
A Helium-Neon laser, typically called a HeNe laser, is a small gas laser with many industrial and scientific uses. These lasers are primarily used at 632.8 nm in the red portion of the visible spectrum.
The He-Ne laser produces three different wavelengths that are 1.152µm, 3.391 µm and 632.8nm. At the 1st two the infrared photons are released while at the 3rd one i.e. 632.8nm more energetic photon of red color are released because in spectrum at 632.8 approximately red color occurs.
HeNe lasing medium features several emission peaks, however it is relatively easy to force the laser to oscillate in just one of the emission bands. Once it is done, no spontaneous emission or emission from other bands is detectable. Good beam quality and alignment.
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