Abstract
Single-crystal Sr 0.61Ba 0.39Nb 2O 6 (SBN:61) fibers of high optical quality have been grown by the laser-heated pedestal growth (LHPG) method. Strontium barium niobate, based on its photorefractive properties, is a promising medium for holographic data storage. The use of a fiber bundle in this application is particularly attractive because each individual fiber can store many (10–30) independent holograms with little cross-talk between adjacent fibers. For this purpose, fibers that are oriented with the c-axis perpendicular to the pulling direction are preffered because they provide a significant increase in photorefractive performance when compared to fibers grown along the c-axis. In this paper we report, to our knowledge, the first stable growth of SBN fibers along the [100] and [110] crystallographic axes. Previous attempts to grow bulk crystals with these orientations using the Czochralski technique have been generally unsuccessful because of diameter instability. We do not encounter this problem with the LHPG method and instead find that [100] and [110] fibers can be readily pulled. Growth conditions, morphology and crystal quality are discussed.
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