共查询到20条相似文献,搜索用时 203 毫秒
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从全息光栅法出发 ,详细阐述了应用偶氮苯聚合物光致表面调制效应制备光栅的新工艺 ,说明使用偶氮苯聚合物薄膜制备光栅方法的特点 ,介绍了采用新工艺制备的光栅的独特性质———光栅可热擦除或光学擦除 ,同时提出应用新材料光栅制造方法所面临的问题。采用新工艺实验制备了薄膜光栅 相似文献
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光纤布拉格光栅具有体积小、耐腐蚀、抗电磁干扰、传感灵敏度高、可实现准分布式测量等优点,是一种重要的光纤传感器件。传统紫外激光制备光纤布拉格光栅时需要对光纤进行载氢预处理,这种方法制备的光纤光栅热稳定较差,无法用于极端高温环境。近年来,随着飞秒激光在玻璃材料微加工领域研究的深入,研究人员开始将飞秒激光应用于光纤光栅的研制,飞秒激光制备光纤光栅具有更好的加工灵活性,无需对光纤进行载氢预处理,也无需剥除光纤涂覆层,而且飞秒光纤光栅具有极佳的高温稳定性。介绍了光纤光栅的飞秒激光加工机理,以及三种典型的光纤光栅飞秒激光制备方法,综述了飞秒光纤布拉格光栅在高温传感领域的研究进展。 相似文献
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了降低聚合物/液晶光栅的散射损失,并消除光栅的偏振依赖性,选取了低官能度的光敏单体作为反应体系,并逐步提高光栅的制备温度。首先选用五官能度的DPHPA (dipentaerythritol hydroxyl pentaacrylate)、双官能度的PDDA( phthalic diglycol diacrylate)以及单官能度的NVP (N-vinylpyrrolidone)作为反应体系;其次,在制备过程中在光栅的后面放置加热台,逐步提升制备温度。实验结果表明:当制备温度上升到62 ℃以上,光栅有更多(36%)的液晶析出,相分离比常温下制备时要更完全一些,而且高温下制备的光栅其平整度更高,从而使光栅的散射损失比常温下减小了66.7%,器件的SEM图片也进一步证明了这个结论。同时高温制备也消除了液晶光栅的偏振依赖特性。 相似文献
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利用飞秒激光微加工平台,结合激光直写技术,在50 nm厚的金膜上制备出了二维光栅,研究了扫描速度和扫描间距固定时,飞秒激光能量密度的改变对二维光栅结构的影响。通过扫描电子显微镜(Scanning Electron Microscopy,SEM)对制备的二维光栅的形貌进行表征,并准确测量了光栅参数。利用氦氖激光分析了二维光栅的衍射效果,并与数值模拟得到的图案进行比较,分析了条纹缝宽和栅格尺寸对衍射点阵列光强分布的影响。研究表明飞秒激光直写技术可以方便快速地通过加工参数的改变制备不同尺寸分布的二维光栅。 相似文献
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用倍频晶体KTP实现Nd:YAG激光锁模的研究 总被引:1,自引:1,他引:0
报道用倍频晶体KTP实现Nd:YAG激光锁模的系统研究,给出了该锁模激光器输出脉宽的表达式,并和实验测量值相比较,计算值跟实验结果符合较好.文中还分析了各种参数对该锁模激光输出性能的影响. 相似文献
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The results of theoretical and experimental investigations of the magnetoelectric effect in a magnetostrictive-piezoelectric bilayer structure have been presented. The expression for the magnetoelectric voltage coefficient in the region of electromechanical resonance has been derived based on the joint solution of the equations of motion for the magnetostrictive and piezoelectric media and the constitutive relations. The dependence of the magnitude of the effect on the thickness of the ferrite and piezoelectric layers has been analyzed. The experimental results for nickel-lead zirconate-titanate bilayer structures have been reported. The theoretical results agree perfectly with the experimental data. 相似文献
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M. V. Fok 《Journal of Russian Laser Research》1983,4(2):145-178
The article deals with the interpretation of the experimental results on luminescence and on the degree to which this interpretation is unambiguous and noncontradictory. More than 30 concrete cases are considered and are used as examples to demonstrate that if the experimental conditions that are seemingly of secondary importance are not sufficiently well accounted for the experimental results themselves may turn out to be ambiguous. The particular experimental conditions that can be especially “insidious” in this respect are indicated. The examples concern the kinetics of the luminescence and the investigations of its spectra and polarization. 相似文献
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Comprehensive numerical and experimental analyses of the effect of viscosity on cavitation oscillations are performed. This numerical approach is based on the Rayleigh-Plesset equation. The model predictions are compared with experimental results obtained by using a fibre-optic diagnostic technique based on optical beam deflection (OBD). The maximum and minimum bubble radii as well as the oscillation times for each oscillation cycle are determined according to the characteristic signals. It is observed that the increasing of viscosity decreases the maximum bubble radii but increases the minimum bubble radii and the oscillation time. These experimental results are consistent with numerical results. 相似文献
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This is a report on the single and double charge exchange reactions on nuclie. The emphasis is on recent experimental results and calculations. We limit ourselves to pion energies below 300 MeV. The experimental results and complexity. We present the current level of understanding of the various aspects of the charge exchange process. 相似文献
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本文讨论了在考虑基片各向异性因素时,声表面波在声栅上的Bragg衍射现象。理论分析时,将有关波式和不同模式之间的差别唯象地以它们对应的相速不同来表征之,而不具体讨论这些波式或模式的偏振特性。在分析时,与讨论声-光反常Bragg衍射情形一样采用二波近似,但不借助于引入对应于极化矢量那样的量,而直接由栅区声速分布给出各波式之间的耦合系数。由此而得出的“反常Bragg衍射”公式,与声-光情形下采用极化矢量概念给出的公式一一对应。由这些公式计算的结果,与实验结果良好地符合。
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《Journal of Electrostatics》2005,63(1):37-44
This paper illustrates a new analytical model for determining equivalent salt deposit density (ESDD) on contaminated insulators using wind velocity. The analytical model is derived using the dimensional analysis technique. The values of ESDD from the analytical model are calculated using different values of wind velocity. These results are compared with the experimental results obtained from sites. The analytical results are also compared with the polynomial model output obtained via least-squares analysis of experimental data. It is found that the results obtained by the analytical model are quite consistent with the experimental results for different range of wind velocity. 相似文献