Abstract
We report the first measurements on spatial harmonics of a photorefractive grating. Our method was to create a photorefractive grating with 2 crossed 515 nm plane waves such that the grating wavevector was parallel to the c-axis of a BaTiO3 crystal. We measured the amplitudes of the fundamental and first and second spatial harmonics of the resulting photorefractive grating by measuring the strength of the Bragg scattering of a 633 nm laser from them. We performed these measurements for various values of the grating period ℓg, and as a funciton of the intensity ratio of the two "writing" 515 nm beams. We performed numerical solutions of the model of Kukhtarev1 for these parameters and found excellent agreement with our data.
© 1987 Optical Society of America
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