We recorded real time holographic gratings in a photosensitive liquid material. This material is Norland Optical Adhesive (NOA 65®) mixed with yellow eosin dye. The NOA 65® is a clear, colorless, liquid photopolymer that cures when is exposed to ultraviolet light (UV) but when is mixed with yellow eosin becomes sensitive to visible region. To record the gratings we used the interference between two diode laser, obtaining gratings by refraction index changes. We use two different wavelengths, for recording the gratings and its highest diffraction efficient was obtained when the grating was illuminated with a wavelength.
Preliminary results, of holographic diffraction gratings recording are shown, which the polyvinyl alcohol mixed with a photosensitive agent salt (NH4)2CrO7, and with an adequate quantity of pineapple juice, and synthetic dye. Dye as an element to increment the absorbance profile of the photosensitive material at emission line of 445nm. The diffraction gratings were recorded using laser diode at a wavelength of 445 nm.
We show the behavior of the holographic gratings photosensitive with metallic salt, (NH4)2CrO7 at different hydrolysis concentrations of PVA (poly vinyl alcohol).The holographic gratings were recorded in real time, observing interesting changes in their diffraction efficiency, as a function of the hydrolysis variation of PVA.
Comparative analysis between gratings registered in cupric chloride and cupric chloride films, with synthetic dye is presented. Preliminary results of recorded holographic diffraction gratings are shown, in which the polyvinyl alcohol mixed with a photosensitizing agent, cupric chloride and synthetic dye. The gratings were recorded using laser diode at a wavelength of 445 nm. Experimental results of gratings registered with cupric chloride and synthetic dye showed higher diffraction efficiency than those registered in cupric chloride.
Nopal mucilage potentially has certain properties required for the preparation biofilms which can be used as holographic replication recording medium. In this study, mucilage from nopal was extracted and characterized by its ability to form films under different concentration with polyvinyl alcohol. The transmission holographic diffraction gratings (master) were replicated into nopal films. The results showed good diffraction efficiencies. Mucilage from nopal could represent a good option for the development of films to replication holographic, owing to; its low cost and its compatibility with the environmental.
We show preliminary results of holographic diffraction gratings recorded in an emulsion composed of cupric chloride, PVA, and dye extracted from natural pigments of a succulent cactus. We measure the intensity of light diffracted to first order, the curve of the energy of exposure is shown.
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