Abstract
The development of environmentally robust photosensitive materials for holographic recording is crucial for applications such as outdoor LED light redirection, holographic displays and holographic sensors. Despite the progress in holographic recording materials development, their sensitivity to humidity remains a challenge and protection from the environment is required. One approach to solving this challenge is to select substrate such as cellulose acetate, which is water resistant. This work reports the development of a cellulose-based photopolymer with sensitivity of 3.5 cm2/mJ and refractive index modulation of 2.5 × 10−3 achieved in the transmission mode of recording. The suitability for holographic recording was demonstrated by recording gratings with the spatial frequency of 800 linepairs/mm. The intensity dependence of the diffraction efficiency of gratings recorded in 70 μm thick layers was studied and it was observed that the optimum recording intensity was 10 mW/cm2. The robustness of the structures was studied after immersing the layer in water for one hour. It was observed that the diffraction efficiency and the surface characteristics measured before and after exposure to water remain unchanged. Finally, the surface hardness was characterized and was shown to be comparable to that of glass and significantly higher than the one of PVA-based acrylamide photopolymer.
Highlights
Published: 12 August 2021Holography is a method for the recording and retrieval of information, e.g., images or alphanumerical data, by utilizing interference and diffraction of light
The results demonstrated that there are significant differences between the cellulose matrix and a polymer matrix such as polyvinyl alcohol (PVA) and PMMA, which are traditionally used for polarization holography in azo-dye polymers
Initial studies to test for the optimum thickness of the layers and recording intensity were carried out by recording transmission holographic gratings of spatial frequency of
Summary
Published: 12 August 2021Holography is a method for the recording and retrieval of information, e.g., images or alphanumerical data, by utilizing interference and diffraction of light. As part of the holographic method, the interference pattern created by an object and a reference beam is recorded either in an analog form in a photosensitive medium or digitally, for example in an electrically controlled special light modulator. When the resulting analog or digital hologram is probed with the reference beam, they diffract light that carries information about the original object beam. CA–PEG blended composite for application holography is reported for the first time.The. The properties recording ability the photopolymer was investigated in a volume transmisof the of holographic recording material are tested by recording the sion mode of recording for a range of different recording parameters, including exposure simplest hologram created by the interference of two plane waves—a holographic grating. Depending on the recording geometry, spatial frequency of the interference fringes created by the two recording beams, probe wavelength and the Theoretical
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