Raman measurement and optical properties of Nd:GdCa 4O(BO 3) 3 crystals

H. R. Xia, W. Q. Zheng, Shujun Zhang, Z. X. Cheng, X. F. Cheng, Z. H. Yang

Research output: Contribution to journalArticle

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Abstract

X-ray diffraction measurements on a 0.65 at. % Nd-doped GdCa 4O(BO 3) 3 (Nd:GdCOB) crystal revealed a noncentrosymmetric monoclinic space group Cm with lattice parameters a=8.091±0.001, b=16.023±0.002, c=3.559±0.006Å, and β=101.30±0.01°. The fitting primitive cell contained two Nd:GdCOB units. Raman data show that the characteristic spectra of Nd:GdCOB are mainly associated with BO 3 triangles and partly by Ca(1)O 6 octahedra, which implies that the structural rigidity of Nd:GdCOB is mainly associated with the B-O bond stretching and bending modes and partly by the Ca(1)-O bonds. The large distortions of the Gd/NdO 6 and Ca(2)O 6 octahedra intensify the polar forces and anisotropic lattice forces, which indicates excellent nonlinear properties for Nd:GdCOB. Simultaneously, the large distortions of the Gd/NdO 6 octahedra also provide a suitable crystal field for the activated Nd 3+ ions, with the site symmetry m lacking inversion symmetry. This condition increases the probability of the parity-forbidden f→f transitions. Also due to the greater number of anion groups in the primitive cell, this crystal would be expected to be excellent as a self-frequency doubled material. The absorption parameters calculated by Judd-Ofelt theory show that the transitions 4I 9/24F 5/2 and 4I 9/22H 9/2 have larger absorption cross sections and enable the laser-diode pumping band around 808 nm to be more than 30 nm in bandwidth. In the calculated luminescence parameters, the radiation 4F 3/24I 11/2 transition at wavelength of 1060 nm has the largest fluorescence branch-ratio and differential stimulated-emission cross section.

Original languageEnglish (US)
Pages (from-to)5060-5067
Number of pages8
JournalJournal of Applied Physics
Volume92
Issue number9
DOIs
StatePublished - Nov 1 2002

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optical properties
forbidden transitions
structural stability
symmetry
stimulated emission
cells
triangles
absorption cross sections
crystal field theory
crystals
lattice parameters
parity
pumping
semiconductor lasers
luminescence
inversions
anions
bandwidth
fluorescence
cross sections

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Xia, H. R., Zheng, W. Q., Zhang, S., Cheng, Z. X., Cheng, X. F., & Yang, Z. H. (2002). Raman measurement and optical properties of Nd:GdCa 4O(BO 3) 3 crystals. Journal of Applied Physics, 92(9), 5060-5067. https://doi.org/10.1063/1.1510956
Xia, H. R. ; Zheng, W. Q. ; Zhang, Shujun ; Cheng, Z. X. ; Cheng, X. F. ; Yang, Z. H. / Raman measurement and optical properties of Nd:GdCa 4O(BO 3) 3 crystals. In: Journal of Applied Physics. 2002 ; Vol. 92, No. 9. pp. 5060-5067.
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Xia, HR, Zheng, WQ, Zhang, S, Cheng, ZX, Cheng, XF & Yang, ZH 2002, 'Raman measurement and optical properties of Nd:GdCa 4O(BO 3) 3 crystals', Journal of Applied Physics, vol. 92, no. 9, pp. 5060-5067. https://doi.org/10.1063/1.1510956

Raman measurement and optical properties of Nd:GdCa 4O(BO 3) 3 crystals. / Xia, H. R.; Zheng, W. Q.; Zhang, Shujun; Cheng, Z. X.; Cheng, X. F.; Yang, Z. H.

In: Journal of Applied Physics, Vol. 92, No. 9, 01.11.2002, p. 5060-5067.

Research output: Contribution to journalArticle

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N2 - X-ray diffraction measurements on a 0.65 at. % Nd-doped GdCa 4O(BO 3) 3 (Nd:GdCOB) crystal revealed a noncentrosymmetric monoclinic space group Cm with lattice parameters a=8.091±0.001, b=16.023±0.002, c=3.559±0.006Å, and β=101.30±0.01°. The fitting primitive cell contained two Nd:GdCOB units. Raman data show that the characteristic spectra of Nd:GdCOB are mainly associated with BO 3 triangles and partly by Ca(1)O 6 octahedra, which implies that the structural rigidity of Nd:GdCOB is mainly associated with the B-O bond stretching and bending modes and partly by the Ca(1)-O bonds. The large distortions of the Gd/NdO 6 and Ca(2)O 6 octahedra intensify the polar forces and anisotropic lattice forces, which indicates excellent nonlinear properties for Nd:GdCOB. Simultaneously, the large distortions of the Gd/NdO 6 octahedra also provide a suitable crystal field for the activated Nd 3+ ions, with the site symmetry m lacking inversion symmetry. This condition increases the probability of the parity-forbidden f→f transitions. Also due to the greater number of anion groups in the primitive cell, this crystal would be expected to be excellent as a self-frequency doubled material. The absorption parameters calculated by Judd-Ofelt theory show that the transitions 4I 9/2→ 4F 5/2 and 4I 9/2→ 2H 9/2 have larger absorption cross sections and enable the laser-diode pumping band around 808 nm to be more than 30 nm in bandwidth. In the calculated luminescence parameters, the radiation 4F 3/2→ 4I 11/2 transition at wavelength of 1060 nm has the largest fluorescence branch-ratio and differential stimulated-emission cross section.

AB - X-ray diffraction measurements on a 0.65 at. % Nd-doped GdCa 4O(BO 3) 3 (Nd:GdCOB) crystal revealed a noncentrosymmetric monoclinic space group Cm with lattice parameters a=8.091±0.001, b=16.023±0.002, c=3.559±0.006Å, and β=101.30±0.01°. The fitting primitive cell contained two Nd:GdCOB units. Raman data show that the characteristic spectra of Nd:GdCOB are mainly associated with BO 3 triangles and partly by Ca(1)O 6 octahedra, which implies that the structural rigidity of Nd:GdCOB is mainly associated with the B-O bond stretching and bending modes and partly by the Ca(1)-O bonds. The large distortions of the Gd/NdO 6 and Ca(2)O 6 octahedra intensify the polar forces and anisotropic lattice forces, which indicates excellent nonlinear properties for Nd:GdCOB. Simultaneously, the large distortions of the Gd/NdO 6 octahedra also provide a suitable crystal field for the activated Nd 3+ ions, with the site symmetry m lacking inversion symmetry. This condition increases the probability of the parity-forbidden f→f transitions. Also due to the greater number of anion groups in the primitive cell, this crystal would be expected to be excellent as a self-frequency doubled material. The absorption parameters calculated by Judd-Ofelt theory show that the transitions 4I 9/2→ 4F 5/2 and 4I 9/2→ 2H 9/2 have larger absorption cross sections and enable the laser-diode pumping band around 808 nm to be more than 30 nm in bandwidth. In the calculated luminescence parameters, the radiation 4F 3/2→ 4I 11/2 transition at wavelength of 1060 nm has the largest fluorescence branch-ratio and differential stimulated-emission cross section.

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Xia HR, Zheng WQ, Zhang S, Cheng ZX, Cheng XF, Yang ZH. Raman measurement and optical properties of Nd:GdCa 4O(BO 3) 3 crystals. Journal of Applied Physics. 2002 Nov 1;92(9):5060-5067. https://doi.org/10.1063/1.1510956