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Raman scattering study of reduced Er:LiNbO3 crystals

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Abstract

Raman spectra of as-grown and reduced (or annealed) Er:LiNbO3 crystals, which have different cut orientations, varied Li/Nb ratio, and different Er-do** levels of 0.2, 0.4, 0.6, 1.0, and 2.0 mol%, were recorded at room temperature over a wavenumber range of 50–1000 cm-1 by use of backward scattering geometries. The spectra are assigned on the basis of their Raman scattering features and previous relevant work. A weak but well-resolved peak around 633 cm-1 appears in the E(TO) spectra that were recorded under the configuration of X(ZY)X̄(for an X-cut sample) or Y(ZX)Ȳ(for a Y-cut sample) for all crystals studied. The appearance of this peak in the E(TO) spectrum provides further evidence for a previous attribution of this peak to E(TO9) mode. Some additional peaks distributed in the low wavenumber region ranging from 101–137 cm-1 are attributed to Er3+ fluorescence with a wavelength range of 490.41–491.3 nm. The reduction effects include a significant drop of the Raman scattering intensity and a slight narrowing instead of a broadening in the linewidth. The reduction procedure hardly affects the spectral shape and the wavenumber of most of the phonons. The anneal effect is similar to the reduction effect and both effects are not as obvious as the vapor transport equilibration (VTE) effect. In addition, the present Raman scattering result provides evidence for our earlier reported individual result on light-induced diffraction from strongly reduced Er:LiNbO3 crystals.

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Authors and Affiliations

  1. Department of Opto-electronics and Information Engineering, College of Precision Instruments and Opto-electronics Engineering, Tian** University, Tian**, 300072, China

    D.L. Zhang & J. Zhang

  2. Department of Electronic Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong, China

    D.L. Zhang & E.Y.B. Pun

  3. Department of Physics, College of Physics Science, Nankai University, Tian**, 300071, China

    Y.F. Wang

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  1. D.L. Zhang
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  2. J. Zhang
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  3. Y.F. Wang
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  4. E.Y.B. Pun
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Correspondence to D.L. Zhang.

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PACS

42.70.Hj; 81.05.-t; 63.20.-e; 78.30.-j.

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Zhang, D., Zhang, J., Wang, Y. et al. Raman scattering study of reduced Er:LiNbO3 crystals. Appl. Phys. A 81, 1009–1018 (2005). https://doi.org/10.1007/s00339-004-2897-2

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  • DOI: https://doi.org/10.1007/s00339-004-2897-2

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