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Crystal structure and optical activity of La3Ga5SiO14 crystals

Shopa Ya., Ftomyn N. and Sokoliuk I.

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Abstract. Using a laser polarimeter (635 nm), we have obtained a spatial distribution map of optical rotatory power (OR) on a z-cut sample of langasite crystals La3Ga5SiO14 with the transverse dimensions of 317 mm2 and the thickness of 0.945 mm. A possible impact of linear optical birefringence on the measured OR is clarified. Basing on polarizability theory of the optical activity effect, the OR is calculated as a function of disordering structure parameters of the material under investigation. It is shown that the structural disorder prevails in the spatial changes of OR along the optic axis.

Keywords: optical activity, polarizability, polarimetry, structural disorder

PACS: 61.50.Ah, 78.20.Ek, 78.20.Fm
UDC: 535.51, 535.56, 538.911
Ukr. J. Phys. Opt. 15 155-161
doi: 10.3116/16091833/15/3/155/2014
Received: 14.07.2014

Анотація.  За допомогою лазерного поляриметра (635 нм) побудовано мапу просторового розподілу питомого оптичного повертання (ОП) для зразка Z-зрізу кристалів лангаситу La3Ga5SiO14 із поперечними розмірами 317 мм2 і товщиною 0,945 мм. Ураховано можливий вплив лінійного двозаломлення на вимірюване ОП. На основі теорії поляризованості для оптичної активності розраховано питоме ОП як функцію параметрів розупорядкування структури досліджуваного матеріалу. Показано, що структурне розупорядкування переважає в просторових змінах оптичної активності вздовж оптичної осі.
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