Abstract
Holographic parameters of dichromated gelatin layers are improved by introducing electron donors such as N-N′ dimethylformamide into the layers. Simple reflection holograms are recorded. Their diffraction efficiency is greater compared with that of standard dichromated gelatin holograms. Recording at 6 mJ/cm2 (λ = 488 nm) gives a diffraction efficiency of ∼40%. The presence of electron donors does not deteriorate the hologram SNR. Heat treatment of recorded but undeveloped holograms leads to higher holographic sensitivity. EPR experiments show that the speed of photoreduction of chromium ions is changed by electron donors and by baking. This is confirmed by refractive-index and gelatin-melting-point temperature measurements. Baking affects the position of the diffraction efficiency spectral maximum as well.
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