查询词典 beam-focusing

The energy threshold of the first Stokes is calculated according to an approximate theory including the effect of focused pump beam and beam quality.

根据考虑泵浦聚焦和泵浦光束质量影响的近似拉曼散射理论计算了泵浦阈值的理论曲线，并与实验数据和有关文献进行了比较。

There exists a maximum for the amplification of high-power Stokes beam which is restricted by the energy of pump beam, the absorption coefficient of medium and the length of medium cell, etc.

通过优化介质池长和介质吸收系数等参量可以提高斯托克斯光放大的最大值，并获得较高的能量提取效率。

RS comply with the special growth law,does not have" threshold "characteristics.lt depends not only on the intensity of pump beam but also on the intensity of Stokes beam itself.

tokes束的增长不仅依赖于泵浦波的强度，而且也和自身的强度有关系。

In the second chapter, the operating principle of solid-state laser is analyzed. Based on the model of four-level system and with the space-related rate equations, the space distribution of laser beam and pump beam, the threshold pump power, the output power, the slope efficiency, the input-output characteristic and the effect of space variables on the output character are studied. Also, the introcavity second harmonic generation theory is discussed.

第二章分析了固体激光器的工作原理，以四能级系统为模型，从与空间相关的速率方程出发，研究了泵浦激光和振荡激光的空间分布、阈值功率、输出功率与斜效率、LD端面泵浦固体激光器的输入输出特性及各空间变量对输出特性的影响，并讨论了腔内二次谐波产生理论。

When a weak beam is also present,the fanning distribution isshifted to a larger α′relative to the case when only pump beam ispresent.

在强泵浦光引起的Fanning效应中，加上弱信号后，Fanning光分布的峰值将向弱信号方向位移。

Due to shrinkage of the beam waist of laser mode to match the pump beam, this laser can attain very high intensity in the pump region of gain medium and therefore most of its gain is depleted even by a standing wave.

由於雷射模会自动调整大小以符合泵浦光斑，雷射可以在被帮浦增益介质区域内达到很高的光强度，而使得大部分的增益被高强度的驻波消耗掉。

As for beam band correction, accurate roll angle estimation is needed in order to guarantee elevation antenna pattern correction precision. Moreover, the inter-beam radiometric discrepancy should also be estimated and compensated properly.

针对条带不均匀性校正，其关键在于精确估计滚动角以提高距离向天线方向图校正精度，另外，还需要对于波束间的相对增益偏差进行估计和补偿。

The prototype system considers the geometry of the building, the position of the source and receiver, and the acoustic properties of the sound transmission (the sound absorption coefficient of the walls and the temperature of the environment). The system then builds the beam tree by beam tracing, and finds all possible paths of the transmission and reflection. All sound paths are then traced to compute the sound obtained by the receiver.

本系统利用建筑物的几何空间、音源与接收者的资讯，考虑建筑材料的吸音系数、环境的温度等声学相关属性，使用光束追踪法建立光束树，寻找各种可能的穿透与反射路径，建立声音的路径模型，并且计算声音的衰减，处理声音的音响输出，来模拟接收者所听到的声音与回响。

The results show that the layered beam model can well describe the nonlinear behavior of the prestressed concrete beams and it is valuable to evaluate the serviceability ofthe cracked beam.

算例表明分层梁单元模型对于预应力混凝土梁的非线性分析有良好的适应性，对梁开裂后的使用性能评估有实际应用价值。

The dynamics of the beam pumping well system can be described in a more realistic way by solving the combined models,and hence a method for studying motion and forces of the beam pumping system driven by different types of motor is provided.

将这些数学模型联立求解，可更真实地描述抽油机井系统的运动规律，从而提供了一种研究不同特性电机驱动下抽油机井的运动和受力的方法。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷