Fig. 1. Molecular structural formula of green-sensitive cyclopentanone photosensitizer

Fig. 2. Fabrication process of holographic photopolymer samples

Fig. 3. Optical path of holographic test. (a) Test of exposure characteristics; (b) test of angle selectivity of Bragg grating; (c) reconstruction of hologram

Fig. 4. Photophysical and photochemical properties of photosensitizer in DMF solution. (a) Normalized UV-VIS absorption spectra; (b) UV-VIS absorption intensity of photosensitizer under 532 nm laser irradiation varies with light time

Fig. 5. Photopolymerization kinetics of prepolymer solution containing 0.02% photosensitizer under 532 nm laser irradiation. (a) Curves of carbon-carbon double bond conversion rate with time; (b) curves of monomer polymerization rate with time

Fig. 6. Holographic exposure characteristic curves of samples containing 0.02% photosensitizer under interference exposure of 532 nm laser

Fig. 7. Relationship between diffraction efficiency and exposure of samples containing BTMI under 532 nm monopulse laser exposure

Fig. 8. Original image and hologram reconstruction image recorded by sample containing BTMI. (a) Dot diameter is 100 μm; (b) dot diameter is 30 μm