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Wu W.,Shanghai Applied Radiation Institute | Yin J.,Shanghai University | Xiao Z.,Shanghai University | Luo W.,Shanghai Applied Radiation Institute | And 2 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2013

Infrared spectra of optical fiber cladding materials have been investigated by the irradiating treatment, and the quenching and annealing process with different temperature. The results show that, with the method of quenching firstly, the 1100 cm-1 peak in the IR spectrum of cladding materials changes dramatically, which may attribute to the quenching process, corrected the fictive temperature and induced structural disorder. And then, the irradiation process induces defects. Finally annealing process can make the material become more stable, but the intensity and shape of 1100 cm-1 peak no change remarkably. This result shows that annealing process repaired the structural disorder induced by quenching process and the defects induced by irradiated. © 2013 SPIE.


Wang T.,Shanghai University | Xiao Z.,Shanghai University | Luo W.,Shanghai University | Luo W.,Shanghai Applied Radiation Institute | And 4 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2013

Radiation-induced transmission loss in Low Water Peak Single Mode (LWPSM) fiber has been investigated. Formation and conversion processes of defect centers also have been proposed using electron spin resonance in the fiber irradiated with gamma rays. When the irradiation dose is low, Germanium electron center (GEC) and self-trapped hole center (STH) occur. With the increase of dose, E' centers (Si and Ge) and nonbridge oxygen hole centers (NBOHCs) generate. With the help of thermal-bleaching or photo-bleaching, the radiation-induced loss of pre-irradiation optical fiber can be reduced effectively. The obtain results also have been analyzed in detail. © 2013 SPIE.


Yin J.,Shanghai University | Wen J.,Shanghai University | Luo W.,Shanghai University | Luo W.,Shanghai Applied Radiation Institute | And 3 more authors.
2011 Asia Communications and Photonics Conference and Exhibition, ACP 2011 | Year: 2011

Reducing the radiation-induced transmission loss in low water peak single mode fiber (LWP SMF) has been investigated by using photo-bleaching method with 980nm pump light source and using thermal-bleaching method with temperature control system. The results show that the radiation-induced loss of pre-irradiation optical fiber can be reduced effectively with the help of photo-bleaching or thermal-bleaching. Although the effort of photo-bleaching is not as significant as thermal-bleaching, by using photo-bleaching method, the loss of fiber caused by radiation-induced defects can be reduced best up to 49% at 1310nm and 28% at 1550nm in low pre-irradiation condition, the coating of the fiber are not destroyed, and the rehabilitating time is just several hours, while self-annealing usually costs months' time. What's more, the typical high power LASER for photo-bleaching can be 980nm pump Laser Diode, which is very accessible. © 2011 SPIE-OSA-IEEE.


Luo W.,Shanghai University | Luo W.,Shanghai Applied Radiation Institute | Xiao Z.,Shanghai University | Wen J.,Shanghai University | And 4 more authors.
2011 Asia Communications and Photonics Conference and Exhibition, ACP 2011 | Year: 2011

Defect centers play a major role in the radiation-induced transmission loss for silica optical fibers. We have investigated characteristics of the best known defect centers E' in silica optical fiber material irradiated with ray at room temperature, and measured by using electron spin resonance (ESR) and spectrophotometer. The results show that the defect concentrations increase linearly with radiation doses from 1kGy to 50kGy. We have established the mechanism models of radiation induced defect centers' formation. We have also studied the influences of thermal annealing on defect centers. The radiation induced defect centers can be efficiently decreased by thermal annealing. Particularly, the defect concentration is less than the initial one when the temperature of thermal annealing is over 500°C for our silica samples. These phenomena can also be explained by the optical absorption spectra we have obtained. © 2011 SPIE-OSA-IEEE.


Wang Y.,Shanghai Applied Radiation Institute | Zhu L.,Shanghai Applied Radiation Institute | Yang X.,Shanghai University | Shao E.,Shanghai University | And 3 more authors.
Journal of Materials Chemistry A | Year: 2015

A simple and effective route has been developed to synthesize a three-dimensional (3D) Mn3O4 hierarchical architecture, which shows a flower-like morphology and is composed of Mn3O4 nanosheets. Two experimental parameters, hydrothermal temperature and NaOH addition speed, were revealed to have critical effects on the formation of the morphology. Furthermore, these Mn3O4 materials were successfully applied to degrade the organic pollutants in water. Compared with Mn3O4 nanoparticles and nanorods, 3D flower-like Mn3O4 nanostructures are found to most heavily enhance the MB degradation efficiency of the UV/H2O2 advanced oxidation process (AOP), which comes from their high BET surface area and good absorption ability. This journal is © The Royal Society of Chemistry 2015.

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