Title page for etd-0714108-175707


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URN etd-0714108-175707
Author Chun-Te Wu
Author's Email Address No Public.
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Department Electro-Optical Engineering
Year 2007
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Dynamical Fluorescent Characteristic of Broadband Cr-doped Fibers by Drawing Tower
Date of Defense 2008-06-21
Page Count 89
Keyword
  • drawing tower
  • cr-doped fiber
  • dynamical fluorescent characteristic
  • Abstract   Currently, The Cr-doped fibers are grown by LHPG method or drawing-tower technique. The Cr-doped YAG preform was firstly fabricated by a rod-in-tube method. We have successfully fabricated the Cr-doped fibers by using a commercial drawing-tower technique. By employing a negative pressure control in drawing-tower technique on the YAG preform, the Cr-doped fibers with a better core circularity and uniformity, and good interface between core and cladding were fabricated. The core non-circularity was smaller than 3%, the spontaneous emission spectrum showed the bandwidth that approach to 300 nm, and the output power density level have promoted to a few nW/nm.
     In this study, we focused on the analysis of dynamic fluorescent characteristics of Cr-doped fibers in order to improve the quality effectively. The lifetimes of Cr4+ fluorescence and concentration of Cr ions were 1.5 μs and 510 μg/g, respectively.The concentration of the Cr ions was less than the Cr-doped fibers grown by LHPG method. The high-resolution micrograph showed that there was nano-crystalline structure in the core surrounded by SiO2 amorphous matrix. These nano-particles gathered at the core and formed micrometer clusters, and therefore resulted in high scattering loss around 1.17dB/cm.
      In order to improve the Cr-doped fibers quality, reduce propagation loss, and promote the spontaneous emission power density. We have to decrease the temperature and drawing speed in the drawing process Therefore, the new Cr-doped fibers may have the potential for being used as a new generation broadband fiber amplifier to cover the bandwidth of the entire 1.3-1.6 μm range which exhibit 300 nm usable spectral bands.
    Advisory Committee
  • Ching-Ting Lee - chair
  • Jau-Sheng Wang - co-chair
  • Sheng-Lung Huang - co-chair
  • Yi-Chung Huang - co-chair
  • Wood-Hi Cheng - advisor
  • Files
  • etd-0714108-175707.pdf
  • indicate in-campus access in a year and off_campus not accessible
    Date of Submission 2008-07-14

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