{"term":{"id":"08871","title":"second harmonic generation","longtitle":"IUPAC Gold Book - second harmonic generation","doi":"10.1351\/goldbook.08871","code":"08871","status":"current","synonym":"<em>synonym<\/em>: frequency doubling","definitions":[{"id":1,"text":"Transformation of the input monochromatic radiation beam into a double frequency (half wavelength) beam.","notes":{"1":"Frequency doubling is a nonlinear optic effect typical of non-centrosymmetric crystals with a high second-order electric susceptibility. It is utilized in the laser and radio-communication techniques to obtain higher frequency signals, e.g., that of the wavelength \\(\\pu{533 nm}\\) from the signal of \\(\\pu{1066 nm}\\)."},"sources":["PAC, 2022, 94, 15. 'Glossary of terms relating to electronic, photonic and magnetic properties of polymers (IUPAC Recommendations 2021)' on page 46 (https:\/\/doi.org\/10.1515\/pac-2020-0501)"]}],"altoutputs":{"html":"https:\/\/goldbook.iupac.org\/terms\/view\/08871\/html","xml":"https:\/\/goldbook.iupac.org\/terms\/view\/08871\/xml","plain":"https:\/\/goldbook.iupac.org\/terms\/view\/08871\/plain"},"citation":"Citation: 'second harmonic generation' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. 10.1351\/goldbook.08871","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.","collection":"If you are interested in licensing the Gold Book for commercial use, please contact the IUPAC Executive Director at executivedirector@iupac.org .","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.","accessed":"2026-06-24T14:25:11+00:00"}}