liquid ion laser

https://doi.org/10.1351/goldbook.L03583
A liquid laser in which rare earth ions in solution are used as the laser active medium. An example is KrF in liquid Krlaser.
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 1921 [Terms] [Paper]