MICRO- AND NANO-STRUCTURES OF NOMINALLY PURE STOICHIOMETRIC LITHIUM NIOBATE SINGLE CRYSTAL IN RAMAN SPECTRA

The authors show that bandwidths in Raman spectra of ferroelectric photo-refractive single crystals may depend on wavelength of laser radiation exciting the spectrum. Raman bands of lithium niobate single crystals are broader if the spectrum is excited by laser radiation in visible as compared with...

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Bibliographic Details
Published in:Integrated ferroelectrics 2009-11, Vol.109 (1), p.48-54
Main Authors: SIDOROV, N. V., YANICHEV, A. A., CHUFYREV, P. G., PALATNIKOV, M. N., MAVRIN, B. N., BORMANIS, K.
Format: Article
Language:English
Subjects:
Bandwidths
Comparative analysis
Crystals
Ferroelectric materials
Ferroelectrics
Lasers
Lithium
Lithium niobate
Lithium niobates
Nanocomposites
Nanomaterials
Nanostructure
photo-refraction
Raman spectra
Single crystals
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Summary:The authors show that bandwidths in Raman spectra of ferroelectric photo-refractive single crystals may depend on wavelength of laser radiation exciting the spectrum. Raman bands of lithium niobate single crystals are broader if the spectrum is excited by laser radiation in visible as compared with the spectrum excited by infrared laser radiation. Local microscopic structural heterogeneities of altered index of refraction are shown to appear in parts of the crystal under laser irradiation. Under visible radiation the structural heterogeneities provide additional contribution to broadening of Raman bands. Similar microscopic heterogeneities are practically absent at laser irradiation in near-infra-red.
ISSN:1058-4587
1607-8489
DOI:10.1080/10584580903432460