Fabrication and characterization of polycrystalline Ho:CaF2 transparent ceramics for 2.0μm laser application

•Ho:CaF2 nanopowders were successfully synthesized by direct-precipitation.•Highly transparent Ho:CaF2 polycrystalline ceramics were fabricated by HP method.•The in-line transmittance of Ho:CaF2 ceramics reaches at 89% at 1300nm.•Spectral properties Ho3+ ion in CaF2 transparent ceramics were investi...

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Bibliographic Details
Published inMaterials letters Vol. 207; pp. 37 - 40
Main Authors Li, Weiwei, Huang, Haijun, Mei, Bingchu, Song, Jinghong, Yi, Guoqiang, Guo, Xinsheng
Format Journal Article
LanguageEnglish
Published Elsevier B.V 15.11.2017
Subjects
CaF2
Holmium
Microstructure
Spectral properties
Transparent ceramics
Transparent ceramics
Microstructure
CaF2
Holmium
Spectral properties
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Summary:•Ho:CaF2 nanopowders were successfully synthesized by direct-precipitation.•Highly transparent Ho:CaF2 polycrystalline ceramics were fabricated by HP method.•The in-line transmittance of Ho:CaF2 ceramics reaches at 89% at 1300nm.•Spectral properties Ho3+ ion in CaF2 transparent ceramics were investigated. In this paper, high optical quality of Ho:CaF2 (2at%) transparent ceramics based on nanopowders were fabricated by hot-pressed method successfully. Ho:CaF2 ceramics with the average size of about 500nm were obtained at 800°C for 1h. The transmittance of the sample measured to be 89% at the wavelength of 1300nm. The reduced transmittance in the near-IR range is likely due to the residual pores in the ceramics. The spectral properties of Ho:CaF2 ceramics demonstrated that there is a strong emission peak around 2030nm under the excitation of 640nm.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2017.07.057