Optics LettersExact solution to photorefractive and photochromic two-wave mixing with arbitrary dependence on fringe modulationMilivoj R. BelićPublished Feb 1, 1996• 2 citationsPublisherAbstractAn exact solution to the slowly varying envelope wave equations for two-wave mixing with both photorefractive and photochromic gratings present and with an arbitrary dependence of the gain and absorption on the fringe modulation is obtained.DOI10.1364/ol.21.000183