Kushwaha, Satya Kumar and Maurya, Kamlesh Kumar and Narayanasamy , Vijayan and Bhagavannarayana, Godavarthi (2011) Crystalline perfection, EPR, prism coupler and UV-VIS-NIR studies on Cz-grown Fe-doped LiNbO3: A photorefractive nonlinear optical crystal. CrystEngComm, 13 (15). pp. 4866-4872. ISSN 1466-8033

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The Fe-doped (0.05 mol%) lithium niobate (LiNbO3) bulk single crystal was gown by the Czochralski (Cz) method using a co-axial two zone low thermal gradient furnace. The crystalline perfection of the grown crystal was evaluated by high resolution X-ray diffractometry which showed that it does not contain any structural grain boundaries, and the dopants predominantly occupied vacancy sites of Li+ in the lattice. Electron paramagnetic resonance studies revealed the incorporation of Fe3+ ions at Li sites. The Z-cut optically polished 450 μm thick wafer was used for birefringence measurements on a prism coupler spectrometer with 632.8 nm wavelength and it was found that the difference in refractive index (Δn) for ordinary and extraordinary rays is 0.0833. The optical transmission/absorption spectra were studied by UV-VIS-NIR spectroscopy and this showed that the grown crystal has good optical sensitivity for 482 nm wavelength radiation. The present studies reveal that the crystal grown with a two zone low thermal gradient furnace has very good device properties which are needed for holographic data storage applications.

Item Type: Article
Subjects: Chemistry
Depositing User: Mr. Abhishek Yadav
Date Deposited: 21 Nov 2012 08:16
Last Modified: 21 Nov 2012 08:16
URI: http://npl.csircentral.net/id/eprint/831

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