Effect of the refractive index change kinetics of photosensitive materials on the diffraction efficiency of reflecting Bragg gratings

Julien Lumeau (1) , Leonid B. Glebov (2)

1 RCMO - RCMO
2 CREOL - The College of Optics and Photonics [Orlando]

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.

Domaines: Optique / photonique

Julien Lumeau, Leonid B. Glebov. Effect of the refractive index change kinetics of photosensitive materials on the diffraction efficiency of reflecting Bragg gratings. Applied optics, 2013, 52 (17), pp.3993-3997. ⟨hal-00945869⟩