title: Effect of the refractive index change kinetics of photosensitive materials on the diffraction efficiency of reflecting Bragg gratings.
abstract: Experimental and modeled dependencies of the induced refractive index on dosage of UV exposure in photo-thermo-refractive glass for different thermal treatment regimes are presented. Resulting spatial profiles of refractive index modulation in a reflecting Bragg grating recorded by a holographic technique are computed, and corresponding diffraction efficiencies are modeled. It is shown that nonlinearity of the photosensitivity response is responsible for spatial distortions of a recorded grating that result in a decrease of the diffraction efficiency.
authors.affiliation: CREOL, The College of Optics and Photonics, University of Central Florida, Orlando, Florida 32816-2700, USA. julien.lumeau@fresnel.fr
authors.forename: Julien
authors.initials: J
authors.lastname: Lumeau
authors.forename: Leonid B
authors.initials: LB
authors.lastname: Glebov