Applied Physics B

, Volume 87, Issue 1, pp 123–127 | Cite as

Photoconductivity in LiNbO3 crystals codoped with MgO and Cr2O3

  • L. Arizmendi
  • C. de las Heras
  • F. Jaque
  • A. Suchocki
  • S. Kobyakov
  • T.P.J. Han


The photoconductivity of LiNbO3 crystals codoped with Cr2O3 and different concentrations of MgO from 0 up to 6 mol % is reported. The spectral excitation of photocurrent presents an intense band corresponding to the Cr3+ induced blue absorption edge, but illuminating at the 4 A 24 T 1 ionic transition band a weak photocurrent is also excited. The photoconductivity is interpreted in terms of Cr3+ ionization and the formation of NbNb 4+ small polarons as charge carriers. Photoconductivity below about 140 K is suppressed. The analysis of the photocurrent temperature dependence results in a 0.14±0.02 eV binding energy of the polaron at low temperature. Photoconductivity induced by excitation in the intraionic Cr3+ can be explained by a tunnelling process between the excited Cr3+ and the polaron state at the next-nearest-neighbour NbNb 5+.


Absorption Edge Small Polaron Lithium Niobate Crystal Codoped Sample Optical Damage 


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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  • L. Arizmendi
    • 1
  • C. de las Heras
    • 1
  • F. Jaque
    • 1
  • A. Suchocki
    • 2
  • S. Kobyakov
    • 2
  • T.P.J. Han
    • 3
  1. 1.Departamento de Física de MaterialesUniversidad Autónoma de MadridCantoblancoSpain
  2. 2.Institute of PhysicsPolish Academy of ScienceWarsawPoland
  3. 3.Department of PhysicsUniversity of StrathclydeGlasgowUK

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