Coherence time

Coherence Time Measurement of Laser Pulses Using Two Photon Absorption

利用双光子吸收效应测量激光脉冲的相干时间

The recent definitions of coherence time and coherence length are introduced .

综述了目前对相干时间、相干长度的各种定义。

The study of such light will lead us to the important concepts of bandwith and coherence time .

对这种光的研究将使我们得到带宽和相干时间的重要概念。

It can be accessed and scaled more easily , and has a long coherence time .

它具有容易操作和扩展，同时有较长的相干时间的特点。

With quasimonochromatic thermal light as an example , the values of coherence time and coherence length in various definitions are compared each other .

并以准单色热光源为例，比较了它在不同定义下的相干时间、干长度的取值。

The power density spectrum of an inner-phase-modulated optical fiber resonator is analyzed theoretically and experimentally , which is valid for any source coherence time .

从理论上详细分析了光纤环形腔有内相位调制时的输出光电流功率谱密度函数，该理论对任意相干长度的输入激光光源都是有效的。

Then , the relation between cycle number in the coherence time and the veracity of the cyclic statistics estimation is showed , and the experiential formula to select cycle number is presented .

对时变信道进行分析，证明了信道相干时间内周期个数与周期统计量估计精度的关系，给出了计算用于估计周期统计量的最佳周期数的经验公式。

From Monte Carlo simulations , we show that under the condition of coherence time in the current communication environment , the performance of symbol detection with our estimated channel approaches that with perfect knowledge of the channel .

MonteCarlo仿真结果表明，在相干时间允许的范围内，利用本文算法估计出的信道进行信号检测时，其性能十分接近使用准确信道信息的检测结果。

In this report / thesis , we argue that the asymmetry of RF circuit can be overcome by system calibration . The time duration when a calibrated RF transceiver circuit lost its symmetry is much larger than the channel coherence time .

这里，我们假设收发信机的非对称性可以通过射频收发信机的校准来克服，校准后的收发射频电路再次出现非对称性的时间尺度远大于信道的相干时间。

The limitations of the R-D imaging algorithm are analyzed in the fourth part of the dissertation , namely , the scatterers can not walk more than one range cell within coherence time , or there would be Motion Through Resolution Cells ( MTRC ) phenomenon .

分析了距离多普勒（R-D）算法成像的局限性，即在相干时间内，散射点走动不能超过一个距离单元，否则会出现散射点越距离单元走动（MTRC）现象。

Atomic ensemble is an ideal media for the realization of the quantum memories due to the collective enhancement effect in it . Another reason is that there are several kinds of the techniques for atomic ensemble to prolong the coherence time of the spin wave .

原子系综由于存在集体激发增强效应和多种延长自旋波退相干时间的技术而成为实现量子存储的理想选择。

Firstly , the transmitter determines the proper time interval d according to the coherence time of the wireless channels . Then several signal vectors with an interval of d are combined together by a singular matrix , and the result vectors are transmitted at the corresponding time slots .

在该方案中，发射机根据信道相干时间确定合适的时隙间隔d，并利用奇异矩阵对多个相距d个时隙的信号矢量进行线性组合，从而得到系统在对应时隙的发射信号。

A simple ex-pression of the relation between horizontal longitudinal coherence and time is theoretically derived for the case that the propagation direction of solitary internal wave is parallel to the array .

理论分析给出了在孤子内波的传播方向与水平阵平行时，水平纵向相关系数随时间变化的简明表达式。

Specifically Some key technology problems in scene simulation system , such as the visualization of Graph and Image , multi-thread management , the separation of framework and application , and the coherence of time and space are presented .

并对视景仿真系统中的图形图像可视化，多线程管理，框架与应用分开，时空一致性等关键技术做了详细介绍。

Temporal Coherence of Gas Lasers Time is

气体激光的时间相干性

By using mutual coherence function , the characteristics of second-order statistics of the pulse-wave which transmits through the atmospheric turbulence have been studied , including the coherence time and coherence bandwidth .

利用互相干函数，研究了脉冲波穿过大气湍流传播的二阶统计特性，包括相干时间和相干带宽等。