The silica gel-methyl methacrylate organically modified ceramic is proposed for recording of volume holograms. Both low-spatial-frequency (54 line pairs/mm-1) and high-spatial-frequency (1400 line pairs/mm-1) holographic gratings were successfully recorded in the medium by interference of two coherent beams of 351.1-nm wavelength. High diffraction efficiencies (93%) and extremely low absorption and scattering coefficients were measured during the holographic reconstruction by a 632.8-nm He-Ne beam. The optimum UV recording exposure was ~3 J cm-2. A grating refractive-index modulation amplitude of 1.1 × 10-4 was achieved. Virtually no changes in diffraction efficiency were observed after thermal-heating, light-curing, and long-term-aging experiments.
© 1996 Optical Society of America
P. Cheben, T. Belenguer, A. Nuñez, F. del Monte, and D. Levy, "Holographic diffraction gratings recording in organically modified silica gels," Opt. Lett. 21, 1857-1859 (1996)