Mid-IR Optical Property of Dy:CaF2-SrF2 Crystal Fabricated by Multicrucible Temperature Gradient Technology
Mid-IR Optical Property of Dy:CaF2-SrF2 Crystal Fabricated by Multicrucible Temperature Gradient Technology
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多坩埚温度梯度技术制备Dy:CaF2-SrF2晶体的中红外光学特性
DOI：
10.3390/cryst11080907
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发表时间：
2021-07
期刊：
影响因子：
2.7
通讯作者：
Liangbi Su
中科院分区：
文献类型：
--
作者：
Lihe Zheng;Jianbin Zhao;Yangxiao Wang;Weichao Chen;Fangfang Ruan;Hui Lin;Yanyan Xue;Jian Liu;Yang Liu;Ruiqin Yang;Haifeng Lu;Xiaodong Xu;Liangbi Su
采用多坩埚温度梯度法（MC-TGT）合成了不同Dy 3+掺杂浓度的CaF 2-SrF 2晶体。X射线衍射表明，Dy：CaF 2-SrF 2晶体为萤石结构，结晶为立方Fm 3 ² m空间群。通过阿基米德的流体静力学称重原理从测量的密度计算晶体学位点浓度。样品厚度为1.0 mm时，透过率达到90%以上，根据1.7 ~ 11 μm中红外范围内的折射率测量值，得到了Sellmeier色散公式。15%Dy：CaF 2-SrF 2晶体在804 nm和1094 nm处的吸收系数分别为6.06 cm-1和12.71 cm-1。15 at.%的荧光光谱Dy：CaF 2-SrF 2在808 nm激发波长下的最强吸收峰位于2919 nm，半高宽（FWHM）为267 nm。示出了5%、10%和15%的不同Dy 3+掺杂水平的荧光寿命。结果表明，Dy：CaF_2-SrF_2晶体是一种很有前途的紧凑型中红外激光器。
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.
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