continuous wave (CW) laser 

https://doi.org/10.1351/goldbook.CT07348
CW operation of a laser means that the laser is continuously pumped and continuously emits electromagnetic radiation. The emission can occur in a single cavity mode or on multiple modes.
Note:
Some lasers are called CW mode-locked. This indicates that the pulse average power is constant, i.e., there is no Q-switched mode locking.
Source:
PAC, 2007, 79, 293. (Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006)) on page 318 [Terms] [Paper]
Citation: 'continuous wave (CW) laser' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.CT07348 RIS BibTex EndNote
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Last revised: February 24, 2014