Abstract
Permanent reversible diffraction gratings with refractive-index modulations of up to ≃10-4 and with a grating vector perpendicular to the polar axis are realized in LiNbO3:Cu crystals by making use of high temperature recording and charge compensation. The index changes do not result from light-induced space-charge fields and the linear electro-optic effect. They are linked to fixed high-contrast narrow-band absorption gratings of Cu+/Cu2+ ions via the Kramers–Kronig relations.
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PACS
42.65; 42.70; 72.40; 78.20
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Hartwig, U., Peithmann, K., Sturman, B. et al. Strong permanent reversible diffraction gratings in copper-doped lithium niobate crystals caused by a zero-electric-field photorefractive effect. Appl. Phys. B 80, 227–230 (2005). https://doi.org/10.1007/s00340-004-1712-2
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DOI: https://doi.org/10.1007/s00340-004-1712-2