查询词典 reflectivity

The results demonstrated that tapered fiber with core more than ?? 400 μm can be used in high-power laser system, while higher output energy and SBS reflectivity can be achieved by using a fiber phase conjugator with optimum taper size and larger fiber length of thinner side.

结果表明，芯径大于400 μm的大尺寸锥度光纤可以应用于高功率激光系统中，如选择较长的后端光纤长度以及适当的锥度区规格可获得较高的受激布里渊散射能量反射率和输出能量。

The influence of polarization variation of one pump beam on the performance of a "bridge" mutually pumped phase conjugator has been investigated The reflectivity, transmission, and response time were measured for different polarizations and different intensity ratios of input beams.

3讨论了在&桥&式互泵浦相位共轭器中泵浦光偏振态的改变对相位共轭器输出特性的影响。

Using the new model, we have analyzed the influence of longitudinal-mode number, bandwidth and line-width of pumping source on SBS reflectivity, and pointed out the monochromaticity of pumping laser has obvious affect on optical fiber conjugator.

为此，本文第二章在分析了多模石英光纤作为相位共轭介质和其它介质的异同的基础上，首次为光纤相位共轭器建立了多纵模激光泵浦下的受激布里渊散射理论模型。

The self-pumped phase-conjugation with external ring cavity for SBN:Cu is demonstrated.Theexperimental results show that its phase conjugate reflectivity canreach 50%.With the self-pumped conjugator,an light wave withaberration caused by a distorter is corrected.

另外还研究了SBN：Cu晶体环形腔自泵浦位相共轭镜的基本特性，得到高达50％的位相共轭反射率，并利用SBN：Cu晶体环形腔自泵浦位相共轭镜消除了信号光波的位相畸变。

FBG sensing technology and its recent progress in applications isintroduced systematically;the coupled-mode theory and the sensing principleof FBG are expatiated and the Bragg formula and reflectivity formula arededuced;the work principle, variety and essential characteristic of PZT areexpatiated in detail, and the configuration of PZT parts of an apparatus issummarized. The mechanism of piezoelectric electrostriction is analyzeddeeply, and the normalized control model is introduced aiming at analyzinghysteresis characteristic, and an electrical polarization intensity control methodbased on the aforementioned model which can effectively reduce the hysteresischaracteristic is discussed.

论文系统地介绍了光纤光栅传感技术及其应用的研究进展状况；详细地阐述了光纤光栅的耦合模理论及光纤布喇格光栅的传感机理；推导出了光纤布喇格光栅的布喇格公式和反射率公式；详细地阐述了压电陶瓷的工作原理、种类和基本特性，总结了压电陶瓷器件的结构形式，深入地分析研究了压电陶瓷逆压电效应及电致伸缩机理，并针对其迟滞特性给出了压电陶瓷归一化控制模型，在此模型基础上采用电极化强度控制方法有效地降低了压电陶瓷的迟滞特性。

By adopting an intracaity flat surface with low reflectivity and controlling the ratio of subcavity lengths, the repetition rate of this compact femtosecond Cr:forsterite laser can be multiplied from 100 MHz to 500 MHz in femtosecond regime. Repetition rate higher than 1GHz can also be achieved.

接著我们置入一个低反射率的腔内平面，将共振腔分为两个次腔，透过次腔长度比例的控制，我们可以将飞秒脉冲的重覆率从100百万赫兹倍增到500百万赫兹，甚至到更高的十亿赫兹以上。

Therefore, it is useful to make further study on heightener of reflectivity and applying in laser system with narrow pulse-width less than 30ns and high repetition rate more than 100Hz for space -communication and laser-detect.In this paper, a new theoretical model is established for optical fiber pumped by broadband laser.

而对光纤相位共轭器而言，关键问题是如何突破SBS反射率低于60％的瓶颈，并应用到重复频率大于100Hz、脉冲窄于30ns的激光系统中获得较高的稳定性和较好的相位共轭效果。

When fiber Bragg grating is pressed by local transverse force, the reflection spectra are independent of the applied length. The wavelength of split point is periodical and linearly proportinal to the applied force. And the reflectivity of split point is approximately hyperbolically tangential versus the applied position.

研究表明，当FBG局部横向受力时，受压长度对反射光谱无影响，反射光谱分裂点的波长与横向作用力呈线性正比关系并具有周期性，分裂点反射率与受力位置的关系为近似双曲正切关系。

Any mechanicalness or reflectivity or infected cause can destroy the nasal function to sustain normal ventilation ,and then cause the obsruction of nasal cavity .

任何机械性、反射性、感染性的原因都可能破坏鼻腔的通气功能，而引起鼻阻塞。

The increase of topsoil evaporation is due to that microbiotic crusts decreased soil surface reflectivity and enhanced the proportion of latent heat in net radiation.

地表蒸发量的增加是因为微生物结皮降低了地表反射率，并提高了蒸发潜热在净辐射中的比例。

Finally, according to market conditions and market products this article paper analyzes the trends in the development of camera technology, and designs a color night vision camera.

最后根据市场情况和市面上产品的情况分析了摄像机技术的发展趋势，并设计了一款彩色夜视摄像机。

Only person height weeds and the fierce looks stone idles were there.

只有半人深的荒草和龇牙咧嘴的神像。