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1·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。

2·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；

3·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。

4·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。

5·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。

6·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。

7·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。

8·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。

9·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。

10·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。