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PERIODICALLY POLED STRUCTURES IN LITHIUM NIOBATE CRYSTALS: GROWTH AND PHOTOELECTRIC PROPERTIES

I. A. Ghambaryan1, R. Guo2, R. K. Hovsepyan1, A. R. Poghosyan1,* , E. S. Vardanyan1, V. G. Lazaryan1

Affiliation

  1. Institute for Physical Researches, National Academy of Sciences, Ashtarak-2, 378410, Armenia
  2. Dept. Electrical Engineering and Materials Research Institute, The Pensylvania State University, University Park, PA, 16802, USA

Abstract

The advantages of producing a periodically poled lithium niobate (PPLN) structure during crystal growth process are the possibility to get thicker and wider structures that leads to greater useful surfaces in addition to the elimination of the subsequent poling process. We report in this paper a new technology of creating bulk periodically poled LiNbO3 single crystals with antiparallel ferroelectric domains, by direct electric field poling during growth processes. Growth system configuration, crystal composition and geometry selection are explored to allow successful control of the direction of spontaneous polarisation using external electric field. PPLN crystal samples with periodicity 10 - 200 mm were grown using this electric field modulated growth technique. The photoelectric and photorefractive properties of PPLN crystals were investigated..

Keywords

Czochralski method, Lithium niobate crystal, Periodical poling.

Submitted at: Dec. 23, 2002
Accepted at: March 12, 2003

Citation

I. A. Ghambaryan, R. Guo, R. K. Hovsepyan, A. R. Poghosyan, E. S. Vardanyan, V. G. Lazaryan, PERIODICALLY POLED STRUCTURES IN LITHIUM NIOBATE CRYSTALS: GROWTH AND PHOTOELECTRIC PROPERTIES, Journal of Optoelectronics and Advanced Materials Vol. 5, Iss. 1, pp. 61-68 (2003)