We report on measurements of thermal expansion coefficients and temperature-dependent refractive indices
of nanoparticle-polymer composite films in which plane-wave volume holograms are recorded. These physical
constants are evaluated for photopolymer films with the incorporation of inorganic nanoparticles or binder
polymer. We show that the incorporation of inorganic nanoparticles in photopolymer is a very effective method
to suppress temperature-dependent film-thickness and refractive-index changes as well as to increase the refractive
index modulation and reduce polymerization shrinkage.