Abstract
Irradiation of lithium niobate crystals with ions causes strong changes of the ordinary and extraordinary refractive indexes. We present a detailed study of this effect. Small fluence of irradiation already yields refractive index changes about ; the highest values reach . These index modulations are stable up to and can be erased thermally, for which temperatures up to are required. A direct correlation between the refractive index changes and the produced lattice vacancies is found.
© 2006 Optical Society of America
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