Laser | Definition, Acronym, Principle, Applications, Types - Britannica Laser, a device that stimulates atoms or molecules to emit light at particular wavelengths and amplifies that light, typically producing a very narrow beam of radiation The emission generally covers an extremely limited range of visible, infrared, or ultraviolet wavelengths
レーザーの基礎：仕組み・特徴・種類をわかりやすく解説 レーザーとは、「Light Amplification by Stimulated Emission of Radiation」の頭字語であり、日本語で「誘導放出による光増幅放射」を意味します。