helium–neon laser

https://doi.org/10.1351/goldbook.H02768
A continuous wave @L03459@ emitting mainly at \(632.8\ \text{nm}\), \(1152.3\ \text{nm}\), and \(3391.3\ \text{nm}\) from excited neutral Ne atoms.
See:
gas laser
Source:
PAC, 1996, 68, 2223. (Glossary of terms used in photochemistry (IUPAC Recommendations 1996)) on page 2246 [Terms] [Paper]