Growth of Ferro-Electric Tungsten Bronze Epitaxial Thin Films for Electro-Optic Device Applications
Final rept. 30 Sep 1982-30 Nov 1985
ROCKWELL INTERNATIONAL CORP THOUSAND OAKS CA SCIENCE CENTER
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Strontium Barium Biobates60 doped with Ce and Fe crystals have now been grown with improved optical quality using the Czochralski technique. The liquid phase epitaxial LPE growth of SBN46 on SBN60 substrate has also been successfully demonstrated, with particularly good results for 100 and 110 film orientations. The recent photorefractive measurements on Ce doped SBN60 crystals show that the Tungsten Bronze, SBN60 crystals are superior in many respects to BaTi03 because of enhanced two beam coupling coefficients, sensitivity and the overall flexibility of tungsten bronze crystals. La3-doped SBN50 single crystals have also been grown for pyroelectric detector studies and it was found that the growth of doped crystals is possible. Crystals as large as 1 to 1.5 cm in diameter have been grown successfully. Current measurements show that this composition exhibits excellent pyroelectric and dielectric properties to use in longitudinal configuration hence, work is in progress to use this composition for pyroelectric detector applications. The role of other cations such as calcium and yttrium has also been studied and they appear to be promising for the proposed device applications.
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