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Concentration optimization of Tb/Yb co-doped alumino-germanosilicate optical fiber for upconversion visible laser applications

  • Lin, Aoxiang;Watekar, Pramod R.;Liu, Xueming;Cho, Hye-Jin;Chung, Young-Joo;Han, Won-Taek
    • Proceedings of the Optical Society of Korea Conference
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    • pp.249-250
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    • 2008
  • We report on the visible photoluminescence of the Tb/Yb co-doped alumino-germano-silicate fibers for visible fiber laser application. By changing the concentration ratios of $Tb^{3+}$ to $Yb^{3+}$, we optimized the solution doping conditions and obtained the highest emission efficiency at 546nm. The luminescence intensity at 546nm was found to increase with the relative increase of $Tb^{3+}$ ions.

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The Information System of Science Technology and the Infrastructure of Information Technology in North Korea (북한의 정보화 기반과 과학기술정보시스템)

  • 송승섭
    • Journal of Korean Library and Information Science Society
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    • v.33 no.1
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    • pp.99-120
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    • 2002
  • This study is to firstly investigate information infrastructure in North Korea such as communication network, hardware, software and etc, and then, based on it, to grasp the present condition of information technology in libraries there. Also, it is to analyze the information system of science technology in order to research the circulation system of science information with focusing on the Central Science Technology Intelligence (CSTI), a representative intelligence agency for science technology in North Korea, and on the retrieval program of “KWANGMYOUNG System”developed by CSTI and used broadly.

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