When the medium density increases (with more atoms), the slow group velocity decreases.
当介质的密度增加时（包含更多的原子），群速度就降低。
The reflection spectrum, time delay, and group velocity dispersion (GVD) of the gratings are analyzed.
并对此种光栅的反射谱，时延及群速度色散进行了理论分析；
To validate the theoretical analysis, a test system for group velocity delay was set up based on RF modulation.
为了验证理论分析，设计了射频调制法测试介质膜滤波器群速度延时的实验装置。
Thus the negative group velocity is simply an apparent velocity as we shall show from the study of energy flow.
因此，负群速度只是表观速度，能流的研究结果也证明了这一点。
In recent years, researches about the controllable group velocity of light propagation had made many progresses.
最近几年中，慢光和超光速的研究取得了很多进展。
Then the possibility of larger phase velocity and group velocity than light speed in dispersive medium is discussed.
然后从色散介质中相速度与群速度的关系，讨论了相速度和群速度超光速的可能性。
The group velocity dispersion properties of photonic crystal fiber (PCF) were investigated in detail by equivalent index model.
应用等效折射率模型对折射率导模光子晶体光纤的群速度色散特性进行了详细的讨论。
The correlation property between the distribution of attenuation factor and that of the group velocity is indicated, in this study.
研究结果显示，在频率域内，面波衰减系数分布与群速度分布具有一定的相关性。
Taking into account of the distribution of the field and group velocity mismatch we also give the optimized size of the new detector.
连系起来。根据辐射场在晶体中分布与超快脉冲群速度失配，还给出了探测器制作的尺寸要求。
The variations of group velocity dispersion and nonlinear frequency shift with the wave frequency and film thickness are also studied.
研究了群色散和非线性频移随频率和薄膜厚度的变化规律。
In all the above cases, the utility for transport of terahertz pulses is limited by the high loss, or by the group velocity dispersion of the guided waves.
在上所述的情况中，太赫兹脉冲的有效传输受限于高损耗，或导波的群速度色散。
Based on the theory of elastodynamics, the longitudinal guided wave and flexural guided wave group velocity dispersion curves for M22 stud were calculated.
根据弹性动力学理论，采用纵向导波与弯曲导波相结合的方法对螺柱所受轴向应力进行无损检测。
The group velocity(U) corresponds to the net result from the addition of all elements with different periods and different velocities within the wave motion.
而群速度（U）符合于波动的不同周期，不同速度的各种因素叠加的净结果。
The results show that the propagation speed of the wave is not equal to the speed of energy flux, but nearly equal to the real part of the complex group velocity.
结果表明，波的传播速度并不等于能流速度，而与复群速度的实部近似相等。
Although previous studies have found that the "group velocity" of light can travel faster than c, the "signal velocity" -the speed at which information travels -cannot.
尽管先前的研究已经证实，光的“群速度”可以超越光速c，而“信号传播速度”——光携带的信息的传播速度——不能超越光速。
The result shows that the edged sampling mirror and the edged vacuum window can be treated as a pair of prisms, which generates negative group velocity dispersion.
分析结果表明，带楔角的取样反射镜与后续光路中使用楔形真空窗口构成了一对棱镜，产生负的群速度色散。
Until now, there is no practical optical buffer. In our case, we try to realize data storage or packet synchronization by slowing down the group velocity of light.
目前还没有可实用的光缓存，我们旨在通过减慢光速来实现信号的存储或者同步。
And a way to calculate the group velocity dispersion is presented when the vertical flat of the wedge lens is placed toward or outward the resonator, respectively.
分析了楔形镜垂直端面朝腔内和朝腔外两种组合方式的色散量计算方法。
Although previous studies have found that the "group velocity" of light can travel faster than c, the "signal velocity" - the speed at which information travels - cannot.
尽管先前的研究已经证实，光的“群速度”可以超越光速c，而“信号传播速度”——光携带的信息的传播速度——不能超越光速。
By using the concept of spatially induced group velocity dispersion, the propagation of Bessel-like pulsed beam which is constant beam waist in free space is studied.
利用空间诱导色散概念，从理论上研究了等束腰宽度的类贝塞尔脉冲光束在自由空间中传输性质。
The effects of phase bias and group velocity dispersion on mode locking mechanism are analyzed. The operating conditions for stable short pulse generation are obtained.
分析了相位偏置和光纤的色散对锁模机制的影响，获得了产生稳定超短光脉冲的条件。
Without considering curvature effect, we study the contribution of the electronic heat capacity, group velocity and density of states of(6,0)Single-walled carbon nanotubes.
在忽略卷曲效应的情形下，计算（6，0）管的电子能量、群速及能态密度三个参量，然后利用这些参量推算重要热学量电子比热客．结果表明；
Through theoretical analysis and numerical simulations, the walk-off effect between sum-frequency pulse and pump pulse caused by Group Velocity Mismatch (GVM) was discussed.
通过理论分析和数值模拟研究了在双脉冲泵浦情况下的级联和频与差频的二阶非线性效应，探讨了走离效应对波长转换的影响。
The paper studies the concepts of phase velocity and group velocity on electromagnetic wave propagation and discusses the relation between signal conveyance and energy conveyance.
文章研究了电磁波传播的群速与相速概念，论证了信号传送与能量传递的必然联系。
The oscillation times decrease with increasing of the initial area of the pulse, but amplitude, group velocity and the medium populations oscillation times of every level increase.
随着脉冲面积的增大，脉冲振荡次数减少，振幅增大，传播速度增大，介质各能级粒子布居振荡次数也增多。
The properties of nonlinear crystal BBO is presented. The walk-off Angle and the spatial walk-off effect, the group velocity mismatch and the temporal walk-off effect are discussed.
对BBO晶体的材料特性，有效非线性系数，以及BBO晶体的走离角与空间走离效应，群速度失配与时间走离效应进行了讨论。
The effects of group velocity dispersion, polarization mode dispersion and nonlinearity in fiber on the performance of wavelength division multiplexing system are analyzed in detail.
论述了光纤群速度色散、偏振模色散及光纤中各种非线性效应对光波分复用系统性能的影响，并给出了为减小其影响而应采取的措施。
The results show that the evolution of the steady-state output parameters of the system varies with the values of modulation parameters, group velocity dispersion and self phase modulation.
研究表明，系统的定态输出随系统的调制深度或调制频率、群速色散或自相位调制等参量值的变化而变化。
The results showed that the effect of group velocity dispersion(GVD) on the pulse with large chip was slight and the effect of spectral width on the self-focusing properties could be ignored.
研究结果表明，群速度色散（GVD）对大啁啾脉冲的影响很小，谱宽对自聚集的影响可以忽略。
Experimentally, a light pulse propagating through the atomic vapor cell has its peak reaching the exit side before entering it, resulting in a negative transit time, and negative group velocity.
研究发现，当光脉冲通过一个原子气室时，在进入前其峰即到达出口处，造成负渡越时间和负群速。
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