Circular Dichroism Spectra of Langasite Family Crystals
in the Range of Electronic Transitions of Structure Defects

V. I. Burkov^a, E. P. Peredere^a, E. V. Fedotov^a, B. V. Mill’^b, and Yu. V. Pisarevski^c

^a Moscow Institute of Physics and Technology, Institutski per. 9, Dolgoprudnyi, Moscow oblast, 141700 Russia

e-mail: optikcentr@mail.mipt.ru

^b Moscow State University, Moscow, Russia

^c Shubnikov Institute of Crystallography, Russian Academy of Sciences, Leninski pr. 59, Moscow, 119333 Russia

Received December 3, 2007

Abstract—The absorption and circular dichroism spectra of langasite family crystals are studied. Wide bands
in the range of 285–500 nm that are related to the structure lattice defects are found. For all the crystals, these
bands are in approximately the same spectral region, have identical structures, and can be attributed to one type
of defects formed by cation vacancies and excess oxygen atoms in the optically active positions.

PACS numbers: 78.20.Ek

DOI: 10.1134/S1063774508050192

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