Accession Number : ADP006757

Title :   Photogyration and Photoinduced Structure Distorting in Doped Linbo sub 3 and Litao sub 3,

Corporate Author : KEMEROVA STATE UNIV (USSR)

Personal Author(s) : Kostritskii, S. M.

Report Date : 22 MAY 1992

Pagination or Media Count : 4

Abstract : In this work photoinduced phenomenons iron-doped (C= 0,01; 0,038; 0,05; 0,07 wt.%) and copper-doped (C =0,01; 0,025; 0,04 wt.%) lithium niobate and lithium tantalate single crystals have been investigated using the Raman scattering (RS) and IR-reflection spectroscopy. The following types of lasers were used as illumination sources: YAG:Nd(3+) (lambda = 10640 A); helium-neon (6328A; Ar(+)(5145, 4880 A); He-Cd(4416 A). A number of studies shows the existence of photovoltaic effect (PVE) in this crystals consisting of high voltage electric field appearance in illuminated regions. The PVE field is 1000 v/cm. in nominally pure crystals and that is 100,000 v/cm in the doped crystals. At the same time it is known that the electrogyration effect could take place with the external electric field imposed on the crystal.

Descriptors :   *REFLECTION, *SINGLE CRYSTALS, COPPER, CRYSTALS, ELECTRIC FIELDS, EXTERNAL, HIGH VOLTAGE, ILLUMINATION, IRON, LASERS, LITHIUM, LITHIUM NIOBATES, LITHIUM TANTALATES, NIOBATES, SPECTROSCOPY, TANTALATES, VOLTAGE, DOPING, INFRARED SPECTROSCOPY, LIGHT SCATTERING, YAG LASERS, PHONONS, REFRACTION, PHOTOVOLTAIC EFFECT, OPTICAL PROPERTIES, LASER BEAMS, SYMPOSIA.

Subject Categories : Optics
      Lasers and Masers

Distribution Statement : APPROVED FOR PUBLIC RELEASE