🌐EnglishEnglishDeutschEspañolFrançaisРусскийفارسی한국어中文日本語EntityQ3123190· pop 11· linked from 22 articlesSum-frequency generationnonlinear optical processAvailable in 11 languagesEspañolFrançaisDeutsch中文日本語РусскийCatalanLithuanianفارسی한국어ConnectionsInternational Standard Book NumberEntityopticsEntityCategoriesNonlinear opticsSurface science