Title: non-linear optical effect
Long Title: IUPAC Gold Book - non-linear optical effect
DOI: 10.1351/goldbook.N04197
Status: current

Definition
An effect brought about by electromagnetic radiation the magnitude of which is not proportional to the irradiance. Non-linear optical effects of importance to photochemistry are harmonic frequency generation, lasers, Raman shifting, upconversion, and others.

Related Terms
- harmonic frequency generation: https://goldbook.iupac.org/terms/view/H02744
- photochemistry: https://goldbook.iupac.org/terms/view/P04588
- upconversion: https://goldbook.iupac.org/terms/view/U06574

Source
- PAC, 1996, 68, 2223. 'Glossary of terms used in photochemistry (IUPAC Recommendations 1996)' on page 2256 (https://doi.org/10.1351/pac199668122223)

Other Outputs
- html: https://goldbook.iupac.org/terms/view/N04197/html
- json: https://goldbook.iupac.org/terms/view/N04197/json
- xml: https://goldbook.iupac.org/terms/view/N04197/xml

Citation: Citation: 'non-linear optical effect' 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.N04197
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Accessed: 2026-07-24T09:27:21+00:00