1 December 2017 Channel waveguides and phase diffraction gratings optically formed in photorefractive surface layers of lithium niobate
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Proceedings Volume 10603, Photonics, Devices, and Systems VII; 106030O (2017) https://doi.org/10.1117/12.2292320
Event: Photonics Prague 2017, 2017, Prague, Czech Republic
Abstract
Channel optical waveguides with spatial optical modulation of their parameters and one-dimensional phase diffraction gratings are generated by laser radiation with wavelengths of 450 and 532 nm within lithium niobate surface layers doped with iron, copper, and their combinations. The characteristics of induced elements are studied by diffraction of light with wavelengths 532 and 633 nm. Formation of photorefractive channel waveguides along forbidden by photorefractive properties of lithium niobate direction using point-by-point exposure of its photorefractive surface is experimentally demonstrated. It is shown that phase diffraction gratings are optically induced only within the crystal surface part doped with photorefractive impurities in studied crystal samples. The dependence of diffraction grating thickness on wavelength of writing light is also demonstrated and explained by distinction of optical absorption within doped layer for light waves of different wavelengths.
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A. Bezpaly, A. Bezpaly, A. Verkhoturov, A. Verkhoturov, V. Shandarov, V. Shandarov, } "Channel waveguides and phase diffraction gratings optically formed in photorefractive surface layers of lithium niobate", Proc. SPIE 10603, Photonics, Devices, and Systems VII, 106030O (1 December 2017); doi: 10.1117/12.2292320; https://doi.org/10.1117/12.2292320
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