Abstract
A study is presented on the capabilities of holographic photorefractive gratings recorded in α-phase proton-exchanged LiNbO3 waveguides as infrared wavelength deflectors. Two different configurations have been analysed, with the grating K-vector parallel and perpendicular to the c-axis, i. e. operating under photovoltaic or diffusion dominated transport. In the parallel case, a diffraction efficiency peak ηmax ∼ 20% and a bandwidth ∆λ ∼ 12 nm have been obtained for Λ = 2π /K = 6.1 µm and an effective hologram thickness L = 12 mm. In the perpendicular case, ηmax ∼ 1% and ∆λ ∼ 5 nm have been obtained for Λ = 3.3 µm and L = 9 mm. The data are in excellent agreement with the behaviour expected from Kogelnik's theory.
© 2003 Optical Society of America
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