A laser that produces a visible (red; 632.8 nanometers) beam of light and in which the active medium is a mixture of helium and neon. He-Ne lasers are often used for alignment of laser optics and as an aid for set-up and alignment of workpiece and fixturing plus recording, printing, and measuring.
A helium-neon laser, usually called a HeNe laser, is a type of small gas laser. HeNe lasers have many industrial and scientific uses, and are often used in laboratory demonstrations of optics. Its usual operation wavelength is 632.8 nm, in the red portion of the visible spectrum.