Self-trapped electron and transient defect absorption in niobate and tungstate crystals

R. T. Williams, K. B. Ucer, Gang Xiong, H. M. Yochum, L. G. Grigorjeva, D. K. Millers, G. Corradi

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9 Citations (Scopus)

Abstract

We have measured transient optical absorption in LiNbO3, KNbO3, PbWO4, CdWO4, and ZnWO4 following band-gap excitation by 200-fs laser pulses and by 10-ns electron pulses. A strong infrared transient absorption band centered near 1 eV was found in a sample of stoichiometric LiNbO3. We tentatively attribute this infrared absorption band to intrinsic electron polarons, following observation and EPR characterization of a similar (persistent) band in Mg-doped, thermochemically reduced congruent LiNbO3 by Schirmer et al., So- called blue-light induced infrared absorption in KNbO3 was investigated by time-resolved spectroscopy as well. In PbWO4, CdWO4, and ZnWO4, broad, transient visible and infrared absorption bands are observed. It is considered whether infrared absorption in PbWO4 may be partly due to self-trapped electrons already characterized by Laguta et al. and Hofstaetter et al. using EPR.

Original languageEnglish
Pages (from-to)265-276
Number of pages12
JournalRadiation Effects and Defects in Solids
Volume155
Issue number1-4
DOIs
Publication statusPublished - Jan 1 2001

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Keywords

  • Cdwo
  • Infrared
  • Knbo
  • Linbo
  • Pbwo
  • Polaren
  • Self-trapped electron
  • Time-resolved spectroscopy
  • Znwo

ASJC Scopus subject areas

  • Radiation
  • Nuclear and High Energy Physics
  • Materials Science(all)
  • Condensed Matter Physics

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