argon ion laser

https://doi.org/10.1351/goldbook.A00439
A CW or pulsed laser emitting lines from 334 to 529 nm from singly ionized argon. Principal emissions are at 488.0 and 514.5 nm.
See: gas lasers
Source:
PAC, 1996, 68, 2223. 'Glossary of terms used in photochemistry (IUPAC Recommendations 1996)' on page 2228 (https://doi.org/10.1351/pac199668122223)