The objective of this work was to develop possible materials for optically stimulated luminescence （OSL） dosimetric applications in real-time measurement. A novel material of LiMgPO4：Tb,Sm,B was prepared by solid-s...The objective of this work was to develop possible materials for optically stimulated luminescence （OSL） dosimetric applications in real-time measurement. A novel material of LiMgPO4：Tb,Sm,B was prepared by solid-state diffusion method at 900 oC. The structure and optical properties of these phosphors were characterized by X-ray diffraction, fluorescence spectro？photometer, and OSL reader. The results showed that the full discrimination between the stimulation and emission spectra made them very fit for the optic-fibre dosimetry. The OSL vs. dose response was linear in the dose range of 0.1 to 216 Gy. It also showed a significant improvement in the stimulation time compared with LiMgPO4：Tb,B. Hence, the phosphor could be used in the real-time dosimeter based on the OSL technology for medical monitoring as well as for environmental dosimetry and space dosimetry.展开更多
The fibre-optic microwave photonic link has become one of the basic building blocks for microwave photonics.Increasing the optical power at the receiver is the best way to improve all link performance metrics includin...The fibre-optic microwave photonic link has become one of the basic building blocks for microwave photonics.Increasing the optical power at the receiver is the best way to improve all link performance metrics including gain,noise figure and dynamic range.Even though lasers can produce and photodetectors can receive optical powers on the order of a Watt or more,the power-handling capability of optical fibres is orders-of-magnitude lower.In this paper,we propose and demonstrate the use of few-mode fibres to bridge this power-handling gap,exploiting their unique features of small acousto-optic effective area,large effective areas of optical modes,as well as orthogonality and walk-off among spatial modes.Using specially designed few-mode fibres,we demonstrate order-of-magnitude improvements in link performances for single-channel and multiplexed transmission.This work represents the first step in few-mode microwave photonics.The spatial degrees of freedom can also offer other functionalities such as large,tunable delays based on modal dispersion and wavelength-independent lossless signal combining,which are indispensable in microwave photonics.展开更多
基金supported by National Natural Science Foundation of China(10875168,10475112)
文摘The objective of this work was to develop possible materials for optically stimulated luminescence （OSL） dosimetric applications in real-time measurement. A novel material of LiMgPO4：Tb,Sm,B was prepared by solid-state diffusion method at 900 oC. The structure and optical properties of these phosphors were characterized by X-ray diffraction, fluorescence spectro？photometer, and OSL reader. The results showed that the full discrimination between the stimulation and emission spectra made them very fit for the optic-fibre dosimetry. The OSL vs. dose response was linear in the dose range of 0.1 to 216 Gy. It also showed a significant improvement in the stimulation time compared with LiMgPO4：Tb,B. Hence, the phosphor could be used in the real-time dosimeter based on the OSL technology for medical monitoring as well as for environmental dosimetry and space dosimetry.
基金supported in part by the National Basic Research Program of China(973)Project#2014CB340104/3NSFC Projects 61335005,61377076,61575142,61431009 and 61671227+1 种基金the United States Army Research Office grant W911NF-13-1-0283Shandong Provincial Natural Science Foundation(ZR2011FM015).
文摘The fibre-optic microwave photonic link has become one of the basic building blocks for microwave photonics.Increasing the optical power at the receiver is the best way to improve all link performance metrics including gain,noise figure and dynamic range.Even though lasers can produce and photodetectors can receive optical powers on the order of a Watt or more,the power-handling capability of optical fibres is orders-of-magnitude lower.In this paper,we propose and demonstrate the use of few-mode fibres to bridge this power-handling gap,exploiting their unique features of small acousto-optic effective area,large effective areas of optical modes,as well as orthogonality and walk-off among spatial modes.Using specially designed few-mode fibres,we demonstrate order-of-magnitude improvements in link performances for single-channel and multiplexed transmission.This work represents the first step in few-mode microwave photonics.The spatial degrees of freedom can also offer other functionalities such as large,tunable delays based on modal dispersion and wavelength-independent lossless signal combining,which are indispensable in microwave photonics.
