### Abstract

X-ray diffraction measurements on a 0.65 at. % Nd-doped GdCa _{4}O(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 ^{4}I _{9/2}→ ^{4}F _{5/2} and ^{4}I _{9/2}→ ^{2}H _{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 ^{4}F _{3/2}→ ^{4}I _{11/2} transition at wavelength of 1060 nm has the largest fluorescence branch-ratio and differential stimulated-emission cross section.

Original language | English (US) |
---|---|

Pages (from-to) | 5060-5067 |

Number of pages | 8 |

Journal | Journal of Applied Physics |

Volume | 92 |

Issue number | 9 |

DOIs | |

State | Published - Nov 1 2002 |

### Fingerprint

### All Science Journal Classification (ASJC) codes

- Physics and Astronomy(all)

### Cite this

_{4}O(BO

_{3})

_{3}crystals.

*Journal of Applied Physics*,

*92*(9), 5060-5067. https://doi.org/10.1063/1.1510956

}

_{4}O(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 _{4}O(BO _{3}) _{3} crystals.** / Xia, H. R.; Zheng, W. Q.; Zhang, Shujun; Cheng, Z. X.; Cheng, X. F.; Yang, Z. H.

Research output: Contribution to journal › Article

TY - JOUR

T1 - Raman measurement and optical properties of Nd:GdCa 4O(BO 3) 3 crystals

AU - Xia, H. R.

AU - Zheng, W. Q.

AU - Zhang, Shujun

AU - Cheng, Z. X.

AU - Cheng, X. F.

AU - Yang, Z. H.

PY - 2002/11/1

Y1 - 2002/11/1

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.

UR - http://www.scopus.com/inward/record.url?scp=18744384699&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=18744384699&partnerID=8YFLogxK

U2 - 10.1063/1.1510956

DO - 10.1063/1.1510956

M3 - Article

VL - 92

SP - 5060

EP - 5067

JO - Journal of Applied Physics

JF - Journal of Applied Physics

SN - 0021-8979

IS - 9

ER -

_{4}O(BO

_{3})

_{3}crystals. Journal of Applied Physics. 2002 Nov 1;92(9):5060-5067. https://doi.org/10.1063/1.1510956