DYNAMICS OF THE DIFFRACTION EFFICIENCY OF SUPERIMPOSED VOLUME REFLECTION HOLOGRAMS DURING THEIR SIMULTANEOUS RECORDING IN A PHOTOPOLYMER MATERIAL
E. F. Pen1,2
1Institute of Automation and Electrometry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
2Novosibirsk State Technical University, Novosibirsk, Russia
Keywords: голографическая запись, дифракционная эффективность, фотополимер, Holographic recording, diffraction efficiency, photopolymer
Abstract
New experimental data on the dynamics of the diffraction efficiency (DE) of superimposed volume reflection holograms with a grating period of ~ 250 nm are obtained when they are simultaneously recorded in the BAYFOL HX TP photopolymer material. The nature and parameters of their mutual influence with a delay in the illumination of one hologram relative to the other are established. It is found that the DE dynamics is practically unaffected by variations in the monomer diffusion time in the interval .12 < tD <0.17 s, but the unsteady behavior of the photopolymerization parameter τp is significantly manifested, which increased from 5 to 15 s in our experiments. The known equations for the photo-induced change in the refractive index of the photopolymer are improved by taking into account the nature of changing of the parameter τp. The calculated dependences of the DE dynamics obtained using the refined formulas are in good agreement with the experimental data (RMS ~ 2%).
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