Term: diode laser https://doi.org/10.1351/goldbook.D01747 Definition: A solid state laser in which the active medium is the p-n junction between p-type and n-type semiconductor host materials. This term is preferred over the sometimes-used term semiconductor laser. Related Terms: 1) solid state laser (http://doi.org/10.1351/goldbook.S05736). 2) active medium (http://doi.org/10.1351/goldbook.A00106). 3) semiconductor (http://doi.org/10.1351/goldbook.S05591). 4) semiconductor laser (http://doi.org/10.1351/goldbook.S05596). 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 1920 (https://doi.org/10.1351/pac199567111913) Citation: 'diode 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.D01747 License: The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) for individual terms. Disclaimer: The International Union of Pure and Applied Chemistry (IUPAC) is continuously reviewing and, where needed, updating terms in the Compendium of Chemical Terminology (the IUPAC Gold Book). Users of these terms are encouraged to include the version of a term with its use and to check regularly for updates to term definitions that you are using.