Journal
APPLIED PHYSICS B-LASERS AND OPTICS
Volume 80, Issue 2, Pages 227-230Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00340-004-1712-2
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Permanent reversible diffraction gratings with refractive-index modulations of up to similar or equal 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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