Source:http://linkedlifedata.com/resource/umls/id/C0392270
UMD: Gas lasers with mixed helium (He) and neon (Ne) as the active medium. Their principal emission wavelength is 633 nm (red), but they also operate at other visible and infrared wavelengths. Operated in continuous-wave and pulsed modes, they are typically used to assist with aiming other nonvisible lasers (e.g., carbon dioxide lasers) in biostimulation and low-level therapies.