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Scirj Volume II, Issue VII, July 2014 Edition
ISSN: 2201-2796

Enhancement of Photorefractive Two-Beam Coupling in KNbO3

Subarna Sarker Rupa, Dr. Yasmeen Haque, Dr. Sushanta Kumar Das

Abstract: A theoretical study has been done to investigate the significant enhancement of the photorefractive and photovoltaic effects of a new co-doped potassium niobate crystal (KNbO3: Fe: Ag) as compared to the result obtained for singly doped potassium niobate crystals. The co-doped Ag impurity enters the K site, rather than the typical Nb site, thus changing the local field in the lattice. It is believed that Fe perturbed by the Ag in the K site is responsible for an enhancement of the linear absorption and photocurrent, as well as for the probable increase in the effective trap density. An enhanced trap density is likely the cause of the increased photorefractive counter-propagating two-beam coupling efficiency.

Reference this Paper: Enhancement of Photorefractive Two-Beam Coupling in KNbO3 by Subarna Sarker Rupa, Dr. Yasmeen Haque, Dr. Sushanta Kumar Das published at: "Scientific Research Journal (Scirj), Volume II, Issue VII, July 2014 Edition, Page 38-43 ".

Search Terms: Photorefractive effect, two-beam coupling, KNbO3: Fe: Ag, photovoltaic effect

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