Hongbing CHEN
,
Hai ping XIA
,
Congshan ZHU
,
Fuxi GAN
材料科学技术（英）
Silica glasses doped with Bi2S3 microcystallite was prepared by the sol-gel process. Photoinduced second harmonic generation (SHG) was observed in the glass when it was irradiated with intense 1.06 μm and frequency doubled laser beams from a mode-locked Nd: YAG laser. It was found that the signal intensity increased with the irradiating time and approached a saturation gradually. The effect may be explained reasonably by the DC field model.
关键词:
Ming FANG
,
Qinghui LI
,
Fuxi GAN
材料科学技术（英）
The optical absorption properties of phase-change optical recording thin films subjected to various initialization conditions were investigated. The effects of initialization power and velocity on optical constants of the Ge2Sb2Te5 thin films were also studied. The energy gap of Ge2Sb2Te5 thin films subjected to various initialization conditions was also obtained. It was found that the optical energy gap of the Ge2Sb2Te5 thin films increased with either increasing initialization laser power or decreasing initialization velocity, with peak of 0.908 eV at laser power of 1000 mW or initialization velocity of 4.0 m/s, but the continued increasing initialization laser power or decreasing initialization velocity resulted in the decrease of the optical energy gap. The change of the optical energy gap was discussed on the basis of amorphous crystalline transformation.
关键词:
Phase transformation
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Qinghui LI
,
Donghong GU
,
Fuxi GAN
材料科学技术（英）
TeOx thin films were prepared by vacuum evaporation of TeO2 powder. Structural characteristic and surface morphology of the as-deposited films was analyzed by using X-ray photoelectron spectroscopy, transmission electron microscopy, X-ray diffractometer and atomic force microscopy. It was found that the films represented a two-component system comprising Te particles dispersed in an amorphous TeO¬2 matrix. The dispersed Te particles were in a crystalline state. The TeO¬x films showed a finely granular structure and a rough surface. Results of the static recording test showed that the TeO¬x films had good writing sensitivity for short-wavelength laser beam (514.5 nm). Primary results of the dynamic test at 514.5 nm were also reported. The TeO¬x films were suitable for using as a blue-green wavelength high density optical storage medium.
关键词:
TeO¬
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