Fundamental Mechanisms Of Photoconductivity In Magnesium Doped Lithium Niobate

Robert Gerson; J. F. Kirchhoff; L. E. Halliburton; D. A. Bryan

doi:10.1117/12.937182

10 March 1987 Fundamental Mechanisms Of Photoconductivity In Magnesium Doped Lithium Niobate

Robert Gerson, J. F. Kirchhoff, L. E. Halliburton, D. A. Bryan

Author Affiliations +

Proceedings Volume 0704, Integrated Optical Circuit Engineering IV; (1987) https://doi.org/10.1117/12.937182
Event: Cambridge Symposium-Fiber/LASE '86, 1986, Cambridge, MA, United States

Abstract

Measurements on a variety of doped (magnesium and/or iron) and undoped lithium niobate crystals in the oxidized state demonstrate an Arrhenius dependence of electrical conductivity on reciprocal temperature between 460 and 590 degrees K. All of the crystals, regardless of doping, had roughly the same conductivity and activation energy (1.23 ev.) in this temperature range, implying that all of the crystals have about the same free carrier concentration and mobility. Based on these data a model is presented in which the enhanced photoconductivity of magnesium doped lithium niobate is attributed to a greatly increased free photoelectron lifetime, due to a correspondingly reduced trapping cross-section of Fe³⁺ for electrons. The smaller cross-section is due to a changed site for Fe³⁺ in magnesium doped crystals. Evidence for the new site is provided by ESR data. Photoconductivity measurements show that the trapping cross-section of Fe³⁺ for electrons in lithium niobate agrees satisfactorily with the value calculated from a simple theoretical model.

Citation Download Citation

Robert Gerson, J. F. Kirchhoff, L. E. Halliburton, and D. A. Bryan "Fundamental Mechanisms Of Photoconductivity In Magnesium Doped Lithium Niobate", Proc. SPIE 0704, Integrated Optical Circuit Engineering IV, (10 March 1987); https://doi.org/10.1117/12.937182

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