UV and IR absorption studies in LiNbO3

Mg crystals below and above the photorefractive threshold

Research output: Chapter in Book/Report/Conference proceedingConference contribution

28 Citations (Scopus)

Abstract

The UV absorption edge and IR spectrum of the OH ion vibration have systematically been measured in LiNbO3 samples for a wide composition and Mg concentration range. The Mg content (0-9 mol %) of the crystals with congruent, stoichiometric and an intermediate composition has been determined by atomic absorption spectroscopy. At a Mg threshold concentration, depending on the Li/Nb ratio, the vibrational frequency of the hydroxyl ions moves abruptly to higher energies, while the shift of the UV-edge changes its direction. Above the threshold value there is an approx. square root dependence for the OH - frequency and a linear dependence for the UV-edge as a function of Mg concentration. It was shown that both NbLi and Mg ions determine the UV-edge of LiNbO3́:Mg.

Original languageEnglish
Title of host publicationPhysica Status Solidi C: Conferences
Pages171-174
Number of pages4
Volume2
Edition1
DOIs
Publication statusPublished - 2005

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thresholds
crystals
ions
absorption spectroscopy
vibration
shift
energy

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

UV and IR absorption studies in LiNbO3 : Mg crystals below and above the photorefractive threshold. / Lengyel, K.; Péter, A.; Polgár, K.; Kovács, L.; Corradi, G.

Physica Status Solidi C: Conferences. Vol. 2 1. ed. 2005. p. 171-174.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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abstract = "The UV absorption edge and IR spectrum of the OH ion vibration have systematically been measured in LiNbO3 samples for a wide composition and Mg concentration range. The Mg content (0-9 mol {\%}) of the crystals with congruent, stoichiometric and an intermediate composition has been determined by atomic absorption spectroscopy. At a Mg threshold concentration, depending on the Li/Nb ratio, the vibrational frequency of the hydroxyl ions moves abruptly to higher energies, while the shift of the UV-edge changes its direction. Above the threshold value there is an approx. square root dependence for the OH - frequency and a linear dependence for the UV-edge as a function of Mg concentration. It was shown that both NbLi and Mg ions determine the UV-edge of LiNbO3́:Mg.",
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AU - Kovács, L.

AU - Corradi, G.

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AB - The UV absorption edge and IR spectrum of the OH ion vibration have systematically been measured in LiNbO3 samples for a wide composition and Mg concentration range. The Mg content (0-9 mol %) of the crystals with congruent, stoichiometric and an intermediate composition has been determined by atomic absorption spectroscopy. At a Mg threshold concentration, depending on the Li/Nb ratio, the vibrational frequency of the hydroxyl ions moves abruptly to higher energies, while the shift of the UV-edge changes its direction. Above the threshold value there is an approx. square root dependence for the OH - frequency and a linear dependence for the UV-edge as a function of Mg concentration. It was shown that both NbLi and Mg ions determine the UV-edge of LiNbO3́:Mg.

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