A theoretical model of quasimonochromatic light beams diffraction by spatially inhomogeneous transmitting multilayer diffraction structures formed in a photopolymer material by a holographic method is presented in this work. This model takes into account the heterogeneity of the amplitude profile of the first harmonic of the refractive index of each layer of the multilayer structure. The model is presented using method of transfer matrixes whose components are the solutions of the coupled waves equations of partial derivates.
Экспериментальное исследование голографических дифракционных ФПМ-ЖК-структур Представлены результаты исследования зависимости дифракционной эффективности голографических дифракционных структур в фотополимерно-жидкокристаллических материалах от азимута поляризации считывающего излучения и от температуры их формирования. В исследованных образцах концентрация жидких кристаллов составляла 25 и 30% мас. Показана анизотропия оптических свойств записанных структур и возможность управления их дифракционной эффективностью путем нагрева образца. Формирование дифракционных структур выполнялось с помощью He-Ne лазера с длиной волны излучения 633 нм. Ключевые слова: фотополимерно-жидкокристаллические материалы, ФПМ-ЖК, дифракционная эффективность, дифракционная решетка, фотополимер, жидкий кристалл, дифракция.
This work presents the results of modeling the influence of amplitude, phase and amplitude-phase heterogeneities of the forming field on the spatial distribution of the refractive index profile and, accordingly, the mode composition of radiation capable of propagating in waveguides formed by the holographic method in the photopolymer-liquid crystalline compositions. The spatial distribution of the refractive index is found by solving the system of kinetic equations. The mode composition of the radiation is determined by solving the dispersion equation for TE-modes.
This work presents the theoretical model of holographic formation of the diffraction optical element (DOE) in photopolymer material (PPM). DOE allows transforming Gaussian light fields to Bessel-like. Self-diffraction of writing light beams at low contrasts is taken into account. It is experimentally shown that influence of effect of self-diffraction in areas of low contrast leads to amplification of level of side’s maxima of diffracted light beam.
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