Abstract
Self-developing ability of photopolymer recording material enables measurements of growth of a refractive index grating in the real-time during a holographic exposure. In our laboratory, we prepare thin layers of photopolymer recording materials and measure their response on harmonic interference field. The results of the measurements are used for characterization of the recording process running in photopolymers and optimization of their chemical composition. Recently, the detection setup has been adapted to measure the phase shift between the recording interference field and the refractive index grating simultaneously with the grow-curves. The phase shift measurement is especially important in the case of photopolymers with nanoparticles as they are spatially redistributed within the layer during the holographic exposure. In the paper, we introduce the principles of the measurement technique, describe our exposure and detection setup, analyze the grow-curve, and show some results obtained from our measurements of the newly developed photopolymer with AgBr nanoparticles.
Highlights
Photopolymers are attractive recording materials for different holographic applications such as display holography, holographic optical elements, or holographic interferometry
The phase shift measurement is especially important in the case of photopolymers with nanoparticles as they are spatially redistributed within the layer during the holographic exposure
AgBr nanoparticles are embedded in a gelatin layer as the refractive index difference is relatively high (2.3 vs 1.5)
Summary
Photopolymers are attractive recording materials for different holographic applications such as display holography, holographic optical elements, or holographic interferometry. In comparison with silver-halide emulsions or dichromated gelatin (classic holographic recording media), a volume phase grating is formed already during the holographic exposure and no additional wet chemical developing process is needed. In the case of a recording material for optical holography, the photopolymerizable system includes nanoparticles with a refractive index which differs from a host matrix. AgBr nanoparticles are embedded in a gelatin layer as the refractive index difference is relatively high (2.3 vs 1.5).
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