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
Original Manuscript: June 3, 1996
Published: November 15, 1996
P. Cheben, F. del Monte, D. Levy, T. Belenguer, and A. Nuñez, "Holographic diffraction gratings recording in organically modified silica gels," Opt. Lett. 21, 1857-1859 (1996)