Enhanced 1-5 μm near-and mid-infrared emission in Ho3+/Yb3+codoped TeO2-ZnF2 oxyfluorotellurite glasses
来源期刊：Journal of Rare Earths2020年第10期
论文作者：Yu Wang Changfu Xu Zhen Zhang Cheng Zheng Jintao Pei Lizhong Sun
文章页码：1044 - 1052
摘 要：Intense 1-5 μm infrared emission from near-to mid-infrared was obtained from Ho3+/Yb3+codoped TeO2-ZnF2 oxyfluorotellurite glasses which were prepared by melt-quenching method under the 980 nm LD excitation,and the emission intensity can be enhanced with the increase of ZnF2 content.Judd-Ofelt analysis was used to evaluate the radiative transition parameters of the excited levels according to the absorption spectra.The stimulated emission cross section of 5 I6→5 I8（1.2 μm）,5 I7→5 I8（2.0μm）,5 I6→5 I7（2.85 μm） and 5 I5→5 I6（4.0 μm） transitions were calculated to reach 0.639 × 10-20,0.760 ×10-20,0.985×10 20 and 0.484 × 10-20 cm2,respectively.The energy transfer coefficients(CDA) are enhanced with the increase of ZnF2 content and phonon contribution ratios of phonon assisted energy transfer process between Ho3+ and Yb3+were figured out.Our results demonstrate that these TeO2-ZnF2 glasses,which possess good thermal stability and transparency,low phonon energy(about 600 cm-1),excellent near-and mid-infrared emission in the range of 1-5 μm wavelength,would be promising material for infrared optical fibers and infrared lasers.
Yu Wang，Changfu Xu，Zhen Zhang，Cheng Zheng，Jintao Pei，Lizhong Sun
Hunan Provincial Key Laboratory of Thin Film Materials and Devices,School of Materials Science and Engineering,Xiangtan University
摘 要：Intense 1-5 μm infrared emission from near-to mid-infrared was obtained from Ho3+/Yb3+codoped TeO2-ZnF2 oxyfluorotellurite glasses which were prepared by melt-quenching method under the 980 nm LD excitation,and the emission intensity can be enhanced with the increase of ZnF2 content.Judd-Ofelt analysis was used to evaluate the radiative transition parameters of the excited levels according to the absorption spectra.The stimulated emission cross section of 5 I6→5 I8（1.2 μm）,5 I7→5 I8（2.0μm）,5 I6→5 I7（2.85 μm） and 5 I5→5 I6（4.0 μm） transitions were calculated to reach 0.639 × 10-20,0.760 ×10-20,0.985×10 20 and 0.484 × 10-20 cm2,respectively.The energy transfer coefficients(CDA) are enhanced with the increase of ZnF2 content and phonon contribution ratios of phonon assisted energy transfer process between Ho3+ and Yb3+were figured out.Our results demonstrate that these TeO2-ZnF2 glasses,which possess good thermal stability and transparency,low phonon energy(about 600 cm-1),excellent near-and mid-infrared emission in the range of 1-5 μm wavelength,would be promising material for infrared optical fibers and infrared lasers.
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