A
gas laser which is pumped using energy transfer from other atoms or molecules. Examples are the helium-neon
(
He
Ne
) the
copper vapour laser.
Source:
PAC, 1995, 67, 1913
(Nomenclature, symbols, units, and their usage in spectrochemical analysis-XV. Laser-based molecular spectroscopy for chemical analysis - laser fundamentals (IUPAC Recommendations 1995))
on page 1919