1. Mid-IR Optical Property of Dy:CaF 2 -SrF 2 Crystal Fabricated by Multicrucible Temperature Gradient Technology.
- Author
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Zheng, Lihe, Zhao, Jianbin, Wang, Yangxiao, Chen, Weichao, Ruan, Fangfang, Lin, Hui, Xue, Yanyan, Liu, Jian, Liu, Yang, Yang, Ruiqin, Lu, Haifeng, Xu, Xiaodong, and Su, Liangbi
- Subjects
OPTICAL properties ,CRYSTALS ,LIGHT transmission ,FLUORESCENCE spectroscopy ,ABSORPTION coefficients - Abstract
Dy
3+ -doped CaF2 -SrF2 crystals with various Dy3+ dopant concentrations were synthesized by multicrucible temperature gradient technology (MC-TGT). Dy:CaF2 -SrF2 crystals were fluorite structured and crystallized in cubic F m 3 ¯ m space group, as characterized by X-ray diffraction. The crystallographic site concentration was calculated from the measured density by Archimedes' hydrostatic weighing principle. The optical transmission reached over 90% with a sample thickness of 1.0 mm. The Sellmeier dispersion formula was obtained following the measured refractive index in a mid-IR range of 1.7–11 μm. Absorption coefficients of 6.06 cm−1 and 12.71 cm−1 were obtained at 804 nm and 1094 nm in 15% Dy:CaF2 -SrF2 crystal. The fluorescence spectra of 15 at.% Dy:CaF2 -SrF2 showed the strongest wavelength peak at 2919 nm with a full width at half maximum (FWHM) of 267 nm under an excitation wavelength of 808 nm. The fluorescence lifetimes were illustrated for different Dy3+ dopant levels of 5%, 10% and 15%. The results indicate that the Dy:CaF2 -SrF2 crystal is a promising candidate for compact mid-IR lasers. [ABSTRACT FROM AUTHOR]- Published
- 2021
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