Helium-neon (He-Ne) lasers are widely used for interferometry because they are inexpensive and provide a continuous, visible output. They operate normally at a wavelength of 633 nm, but modified versions are available with useful outputs at other visible and infrared wavelengths.
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.
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Helium-Neon or HeNe Lasers are gas lasers that use a mixture of Helium and Neon as the gain medium excited by an electrical discharge. HeNe lasers are preferred for many optics lab applications due to their ease of operation and low cost compared to other laser types. Whether you need the flexibility of multiple wavelengths from a single laser, the stability inherent in an atomic transition, or the confidence that comes from keeping an established process, there are many reasons for selecting a He Ne Laser for your research or equipment manufacturing needs.