MICROSTRUCTURES IN FERROELECTRIC LITHIUM NIOBATE SINGLE CRYSTALS
N.V. Sidorov^a, M.N. Palatnikov^a, A.A. Janichev^a, P.G. Chufyrev^a, and K. Bormanis^b
aInstitute of Chemistry, Kola Science Centre RAS, Fersman 14, Apatity, 184209 Murmansk Region, Russia
^bInstitute of Solid State Physics, University of Latvia, Kengaraga 8, LV-1063 Riga, Latvia
E-mail: bormanis@cfi.lu.lv

Received 12 October 2011; accepted 1 March 2012

The local fluctuating micro- and nano-structures having the properties different from the rest of the single crystal bulk are found to appear around the laser beam trace in a crystal just after irradiation in the visible range. As the time or intensity of irradiation increases, the number of such micro-structures transforming into static micro- and macro-formations grows and they merge into a continuous track along the laser beam. The photo-refraction in stoichiometric single crystals is shown to be strong enough for the recording and storage of information.
Keywords: lithium niobate, single crystals, photo-refraction, laser radiation, periodic structure

MIKRODARINIAI FEROELEKTRINIUOSE LIČIO NIOBATO MONOKRISTALUOSE
N.V. Sidorov^a, M.N. Palatnikov^a, A.A. Janichev^a, P.G. Chufyrev^a, K. Bormanis^b
aRusijos MA Kolos mokslinio centro Chemijos institutas, Apatitai, Rusija
^bLatvijos universiteto Kietojo kūno fizikos institutas, Ryga, Latvija

Nustatyta, kad aplink lazerio pluošto taką kristale iškart po jo apšvitos regimojo ruožo spinduliuote susidaro lokalūs fliuktuojantys mikro- ir nanodariniai, savo savybėmis besiskiriantys nuo monokristalinės aplinkos. Didėjant apšvitos trukmei ar intensyvumui, šių mikrodarinių, virstančių statinėmis mikro- ir makroformacijomis, kiekis didėja ir jie susilieja į ištisinį pėdsaką išilgai lazerio pluošto. Parodyta, kad stechiometriniuose monokristaluose yra pakankamai didelė fotorefrakcija, tinkama informacijos įrašymui ir kaupimui.


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