Growth, structure, defects and polarized absorption spectral properties of Er:Yb:YCa₄O(BO₃)₃ crystals

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Zhong, Degao ; Teng, Bing ; Kong, Weijin ; Zhang, Shiming ; Li, Yuyi ; Li, Jianhong ; Yang, Liting ; Cao, Lifeng ; van Smaalen, Sander:
Growth, structure, defects and polarized absorption spectral properties of Er:Yb:YCa₄O(BO₃)₃ crystals.
In: Journal of Solid State Chemistry. Bd. 233 (2016) . - S. 120-124.
ISSN 0022-4596
DOI: https://doi.org/10.1016/j.jssc.2015.10.021

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Abstract

Abstract YCa₄O(BO₃)₃ (YCOB) crystals co-doped with 3 at Er3+ and 20 at Yb3+ were successfully grown by the Czochralski method. X-ray powder diffraction (XRPD) results show that the as-grown Er:Yb:YCOB crystal belongs to the monoclinic system with space group Cm. And the lattice parameters are a=8.076(8) Å, b=16.023(7) Å, c=3.528(4) Å and β=101.15(4)°. Crystal defects were revealed by chemical etching experiments. The density of etch pits, attributed to dislocations and observed on (010) planes, was found to be not uniform along the crystal diameter. The detailed polarized absorption spectra were measured. The polarized absorption cross sections at 977 nm are 1.01×10−20, 1.22×10−20 and 1.05×10−20 cm2 for E//X, E//Y and E//Z, respectively. And the polarized absorption cross sections at 1538 nm is about 1.86×10−20 cm2 for both E//X and E//Z, but for E//Y the result is 1.03×10−20 cm2, which is much smaller. The relationship between the crystal structure and absorption spectra was discussed.