| Summary: | 碩士 === 國立中山大學 === 光電工程學系研究所 === 98 === In recent years, the demand of the optical fiber communication bandwidth is increasing. Therefore, how to develop gain materials has become an important issue. The composition of a chromium-doped glass CaO-GeO2-Li2O-B2O3-Al2O3 is known to have good optical properties, the Cr-doped glass’s radiation wavelength 1.2-1.5μm covering entire communication band. The characteristics of a chromium-doped glass have potential to develop width band light source, optical amplifier and tunable wavelength laser. Our laboratory has successfully developed chromium-doped glass with infrared radiation characteristics. In order to improve it’s optical properties. For example, increasing fluorescence intensity and less transmission loss. We shape the chromium-doped glass samples produced to high resolution transmission electron microscope sample, scanning its fluorescence intensity and Raman shift, two-dimensional graphics, comparing the difference between quench and heat treatment glass sample. The nanocrystal with infrared radiation characteristics appear when the heat treatment Raise up to appropriate temperature. To prove the nanocrystal distribution more uniform, higher fluorescence intensity, and smaller size of the nanocrystal to decreasing the transmission loss . We use different composition, or different nucleating agents and different heat treatment ways to analyze its transmission characteristics and internal structural changes. Near-field scanning optical microscope (SNOM) and high-resolution electron microscopy play a very important role in nano research. We also adjust the polarization film Polarizer use to reach the high resolution about 100nm. With this thesis we can analysis whether Cr3+ ion and Cr4+ ion exist in the same phase of nanocrystal and mapping high resolution fluorescence distribution picture to know how the nanocrystal appear by heat treatment, distinguish different nanocrystal by Ramen shift.
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