排序方式: 共有53条查询结果,搜索用时 140 毫秒
1.
The Zr_(0.5)Hf_(0.5)VPO_7 is successfully synthesized by the solid-state method with near-zero thermal expansion. Powder x-ray diffraction(XRD), Raman spectroscopy, thermal dilatometry, and scanning electron microscopy(SEM) are used to investigate the structure, the phase transition, and the coefficient of thermal expansion(CTE) of Zr_(0.5)Hf_(0.5)VPO_7. The investigation results show that the samples are of the single cubic type with a space group of Pa3ˉ at room temperature(RT).It can be inferred that the superstructure is transformed from the 3 × 3 × 3 superstructure to the 1 × 1 × 1 ideal crystal in a temperature range between 310 K and 323 K. The CTE is measured by a dilatometer to be 0.59 × 10~(-6) K~(-1)(310 K–673 K). The values of intrinsic(XRD) and extrinsic(dilatometric) thermal expansion are both near zero. The results show that Zr_(0.5)Hf_(0.5)VPO_7 has near-zero thermal expansion behavior over a wide temperature range. 相似文献
2.
3.
复杂空间结构矢量光场是当前光场调控领域的重要研究内容。作为一类基于椭圆坐标系的本征激光场,Ince-Gaussian(IG)光场比Laguerre-Gaussian和Hermite-Gaussian两类本征光场具有更丰富的空间自由度,是构建复杂空间结构矢量光场的基本光场之一。基于正交偏振IG偶模和奇模的空间叠加理论,通过空间光调制器分离调控偶模和奇模光场,系统地研究了不同阶数下正交偏振IG模式叠加生成的不同空间结构的IG矢量光场。对获取的矢量光场进行分析,并与理论模拟的结果进行对比,验证了并联分离调控产生IG矢量光场的可行性。 相似文献
4.
Orientation effects on the bandgap and dispersion behavior of 0.91Pb(Zn_(1/3)Nb_(2/3))O_3-0.09PbTiO_3 single crystals 下载免费PDF全文
0.91Pb(Zn1/3Nb2/3)O3--0.09PbTiO3 (PZN--9%PT) single crystals with different orientations are investigated by using a spectroscopic ellipsometer, and the refractive indices and the extinction coefficients are obtained. The Sellmeier dispersion equations for the refractive indices are obtained by the least square fitting, which can be used to calculate the refractive indices in a low absorption wavelength range. Average Sellmeier oscillator parameters Eo, $\lambda$o, So, and Ed are calculated by fitting with the single-term oscillator equation, which are related directly to the electronic energy band structure. The optical energy bandgaps are obtained from the absorption coefficient spectra. Our results show that the optical properties of [001] and [111] poled crystals are very similar, but quite different from those of the [011] poled crystal. 相似文献
5.
6.
7.
8.
根据强非局域介质构成的平面介质波导中同频率和同极化的多光束共同传输模型方程,求得了任意斜入射多光束相互作用的精确解析解。基于强非局域介质空间双光孤子的相互作用原理,提出了利用全同孤子作为信号光来实现全光互联,但实现的逻辑也仅仅局限于短距离作用,还对全光开关抑或反相器作了详细叙述,通过实例给出了这类设计的优化方案。 相似文献
9.
利用强非局域非线性介质中傍轴光束传输的线性模型(Snyder-Mitchell模型)讨论了椭圆坐标系下光束传输过程,通过设立Ince多项式对Gauss函数的调制解得到了强非局域非线性介质中光束稳定传输的Ince-Gauss解.当Ince-Gauss光束的入射功率为临界功率时,光束保持孤子形式传输,否则传输光束的束宽呈现周期性波动,即为呼吸子形式.同时还数值模拟了呼吸子的传输过程.Ince-Gauss光在一定条件下可以连续转换为Hermite-Gauss光或Laguerre-Gauss光,图示展现了几个低阶Ince型光孤子及其转换情况.
关键词:
强非局域非线性介质
Ince-Gauss光
Laguerre-Gauss光
Hermite-Gauss光 相似文献
10.