1. Mid-IR Optical Property of Dy:CaF2-SrF2 Crystal Fabricated by Multicrucible Temperature Gradient Technology
- Author
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Jianbin Zhao, Xu Xiaodong, Hui Lin, Liangbi Su, Ruiqin Yang, Haifeng Lu, Yang Liu, Jian Liu, Fang-fang Ruan, Lihe Zheng, Yangxiao Wang, Weichao Chen, and Yan-yan Xue
- Subjects
Diffraction ,Materials science ,General Chemical Engineering ,Analytical chemistry ,Crystal growth ,02 engineering and technology ,01 natural sciences ,010309 optics ,Inorganic Chemistry ,Crystal ,0103 physical sciences ,Dispersion (optics) ,midinfrared crystal ,Sellmeier dispersion formula ,General Materials Science ,temperature gradient technology ,Crystallography ,Dopant ,crystal growth ,Dy:CaF2-SrF2 ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Full width at half maximum ,Wavelength ,QD901-999 ,0210 nano-technology ,Refractive index - Abstract
Dy3+-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 Fm3¯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.
- Published
- 2021