Assertion: gas laser | /r/HasProperty | helium
Facets:
Source sentences:
text: Gas lasers (helium and helium-neon, HeNe, are the most common gas lasers) have a primary output of a visible red light.
text: William R. Bennett, a co-inventor of the first gas laser (the helium–neon laser), was the first to observe spectral hole burning effects in gas lasers, and he created the theory of "hole burning" effects in laser oscillation.