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domain inversion
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    large-area domain inversion of LiTaO_3 is successfully realized proved by thermoelectric effect and chemistry etching method.
    利用热释电和化学腐蚀方法,成功地实现了钽酸锂晶体的大面积畴反转
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  domain inversion
By considering both a non-Gaussian field distribution and a non-square shaped domain inversion structure, the theoretical values for achieving the optimal QPM-SHG waveguide structure are determined.
      
A stress induced domain formation mechanism was proposed, and domain formation of the as-grown crystals and domain inversion of substrate crystals were explained.
      
For small gaps, in both crystal compositions, emission was accompanied by a partial superficial domain inversion, triggered by surface plasma ignition.
      
The pattern of periodic domain inversion was analyzed theoretically to assure it was appropriate for the electrooptic lens.
      
The quasi-velocity-matching with periodic domain inversion technique was incorporated in the proposed device to make it operate efficiently at a microwave frequency.
      
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The correlation function theory for ferroelectrics is employed to discuss the switching current and the ratio of domain inverted area to film area during domain inversion of a ferroelectric thin film. The theory is fitted to the KNOs experimental data. Fitting results indicate that theory taking into account the thickness of the ferroelectric thin film is better than the KA model.

应用铁电系统关联函数理论,讨论了有限大小铁电薄膜材料极化反转过程中的反转体积比和反转电流,并将结论用于KNO3铁电薄膜反转电流实验数据的拟合。拟合结果表明,考虑薄膜尺寸及厚度影响的结果优于将铁电体视为无限大的KA理论的结果。

Quasi-velocity-matching can be used to realize electron-optics phase modulator with high modulation index,which has essential applications in spectroscopy,laser frequency conversion and improving laser beam uniformity.When laser beam with high power propagates through the modulator,the larger aperture of the device is necessary,so the poling technology on ferroelectric crystal with large-area and high-thickness is essential for high power quasi-velocity-matching.In this paper,the electrical-poling process in...

Quasi-velocity-matching can be used to realize electron-optics phase modulator with high modulation index,which has essential applications in spectroscopy,laser frequency conversion and improving laser beam uniformity.When laser beam with high power propagates through the modulator,the larger aperture of the device is necessary,so the poling technology on ferroelectric crystal with large-area and high-thickness is essential for high power quasi-velocity-matching.In this paper,the electrical-poling process in room temperature on LiTaO_3 crystal with the thickness of 1mm is studied in detail.In order to restrain back current during poling process,control of electrical poling time is adopted in the experiments.large-area domain inversion of LiTaO_3 is successfully realized proved by thermoelectric effect and chemistry etching method.The proposed technology can be also employed in other ferroelectric crystal poling.

利用准速度匹配技术可以实现大调制度的电光相位调制器,从而可以用来展宽激光频谱,它在光谱学、激光变频以及改善激光均匀性等方面有重要应用。当大功率激光通过调制器时,要求晶体的通光面积越大越好,所以大面积并且具有较大厚度的铁电晶体的室温极化技术成为准速度匹配实现的关键技术。详细研究了大面积并且厚度达到1 mm的钽酸锂晶体的电场室温极化过程,针对在极化过程中外部施加高电压时产生的回流现象,采用了改变极化时间来抑制,取得了较好的效果。利用热释电和化学腐蚀方法,成功地实现了钽酸锂晶体的大面积畴反转。该种技术同样可以用于其他大面积铁电晶体的极化。

 
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