Er-doped silica glasses (5000ppm Er/Si mol) were prepared by sol-gel method. Gel samples underwent dehydration in carbon tetrachloride environment. It shows that carbon tetrachloride can remove hydroxyl groups effectively. As a result, I13/2-I15/2 fluorescence lifetime rises considerably. It is also found that fluorescence lifetime is strongly dependent on OH concentration. For samples annealed in carbon tetrachloride at 900°C, fluorescence lifetime as long as 6ms was reached.
Optical microdisk array fabrication with sol-gel techniques was investigated. The characteristics of the microdisk array doped with Rhodamine B were studied with pulsed laser excitation. The whispering-gallery mode (WGM) emission spectra were observed. The WGM is very sensitive to the external circumstance under certain condition. The possible application of microdisk array as sensor also was investigated. We found the amplified spontaneous emission produced from microdisk array is very sensitive to the trace of material detected. The result showed that the microdisk as a kind of sensor has potential application in integrated optics.
The organic-inorganic waveguide fabrication procedure is studied with sol-gel technology. Channel waveguide and 1x4 power splitter were fabricated. The propagation loss is about 0.5dB/cm for channel waveguide. Silicon V-groove was fabricated and it is easy to position fiber to simplify the process for coupling between fiber and waveguide. The fiber was glued to the input side of waveguide. The insertion loss is about 9dB.
Melamine formaldehyde resin films with good optical quality could be fabricated easily by controlling the initial molecular weight. It was used as a matrix of nonlinear molecules. The optical properties of nonlinear molecules guest-host and covalent-bonded type of poled polymer systems were investigated. The optical propagation losses are around 1 dB/cm at 1072 nm for two kinds of films studied. The in situ corona poling second harmonic generation method and UV- visible absorption measurement were used. The experiment results showed that the materials we fabricated have improved second-order susceptibilities and higher thermal stability.
Two stilbene derivatives, DANS and CNDS, were synthesized. The optical properties of organic doped PMMA poled polymer films were investigated with in situ second-harmonic generation (SHG) measurement and UV-visible absorption measurement. Optimum corona poling temperatures of the polymer films were studied. The second-order susceptibility (chi) (2_ of CNDS/PMMA is larger than that of DANS/PMMA, although CNDS molecules in PMMA is less ordered than DANS. The molecular second-order polarizability (beta) of the CNDS was estimated to be about 1.4 X 10-28esu. The relaxation of SHG intensity of CNDS/PMMA was slower than that of DANS/PMMA. It is concluded that CNDS is a better dopant than DANS as second-order nonlinear-optical material.
The optical properties of two kinds of corona poled polymer films, NDA (4'-nitrobenzal-4-N,N-dimethylaniline) and a newly synthesized CNDA ((alpha) '-cyano-4'-nitrobenzal- 4-N,N-dimethylaniline) doped PMMA (polymethyl methacrylate) films were investigated with in situ second-harmonic generation (SHG) measurement and UV-Visible absorption measurement. Optimum corona poling temperatures of the polymer films were found to be lower than glass transition temperatures of the materials. Under the optimum corona poling condition, the second-order nonlinear susceptibility (chi) (2) of CNDA/PMMA is larger than that of NDA/PMMA. The molecular second-order polarizability (beta) of the CNDA was estimated to be about 146 X 10-30 esu from the measured absorbance and (chi) (2). The relaxation of SHG intensity of CNDA/PMMA was slower than that of NDA/PMMA. We concluded that CNDA is a better dopant than NDA as a second- order nonlinear-optical material.
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