发散

Broad area semiconductor lasers with a new no-absorption window has been designed considering cavity degradation of devices, peak power output has increased by 46.5 percent for the new structural device, perpedicularity divergence angle is up to 21°, parallel divergence angle is up to 6.1°.

通过研究大功率半导体激光器腔面退化机理，借助AlxNy等应力膜设计制作了一种新型非吸收透明窗口结构的宽条形半导体激光器，使器件平均最大输出功率提高46.5%，垂直发散角达到21°，水平发散角达到6.1°，2000 h加速老化试验，其千小时退化速率小于0.091%。

Laser's far-field divergence angle is one of its important functional criteria. It not only reflects the laser divergence in the distance, but also can be regarded as the important foundation for laser re-formation.

激光的远场发散角是激光性能指标中的重要一项，不仅反映远距离传输的激光发散特性，而且可以作为激光的整形的重要依据。

In the process of analytical solution, the divergent item can be give up according to the physical meaning of the solution. But there is no chance to give up the divergent item in the step-by-step integration method. This is why the numerical solution is unstable.

在比较了含有此发散项的该通解的数值结果与平均常加速度法的计算结果后，发现它们是一致的，从而找到了逐步积分法不稳定的原因，即逐步积分法不能避开方程解集中的不稳定子集（从而导致了一种发散性的不稳定）。

The vertical beam divergence angle is 28° and horizontal angle is 10°.

器件的垂直发散角为28°，水平发散角为10°。

Based on the landforms, character of region and the concept of time, time and landscape space were integreated. Using emanative thought to exhale core sights to others' housing cluster community on two sides, every community and entrance rooms were dealed with characteristic entrance sights, and an active rooms which could be used for rest and entertainment was formed.

设计根据地形环境和地域特点，通过对时间的思考，让时间与园林空间结合，用发散思维，从中心核心景观向两边发散到各个组团景观，各个组团与入户之间又处理成各个特色的入户景观，形成了一个集休闲与娱乐活动为一体的活动空间。

It is shown that if the author ignores the usual contribution from the vacuum surrounding the system, then the statistical entropy consists of a quadratically divergent term which is proportional to the horizon area of the black hole and two logarithmically divergent terms, the structure of the whole expression is different from that of the black hole entropy.

结果表明，忽略远离围绕系统的真空的贡献，Dirac场的统计熵包含与黑洞视界面积成正比的平方反比发散项和对数发散项，整个表达式的结构与黑洞熵的结构不一样。

In this paper,the power coupling efficiency of semiconductor laser passing through a collimating system is discussed.

在长距离无线光通信中，接收点光功率密度与光束发散角平方呈反比关系，为了获得小的发散角和大的功率耦合效率，要求准直系统有较大的数值孔径，但数值孔径过大会增加像差，因此合理设计功率耦合效率与准直系统的数值孔径就非常重要。

We have developed the studies in impurity-free vacancy diffusion quantum well intermixing.

器件的水平发散角为4.5°，垂直方向的发散角为30°。

The divergence angle of light beam was measured with the method of CCD imaging and computed by second moment method.

通过CCD成像方法对准直后的光束发散角进行了测量，利用二阶矩算法计算出光束发散角。

This problem is also important and valuable in Nonlinear Optics. It will be very helpful to understand how the aberrations affect the course of three- wave mixing, such as the change of conversion efficiency, the distribution of intensity and phase.Small signal solution of aberrated second harmonic generation is deduced from three-dimension three wave coupling functions. The numerical work gives out lot of results of different aberrations. The effects of the fundamental waves aberrations, which will change the conversion efficiency, distribution of intensity and phase in the frequency conversion, is analyzed. It shows that when walk-off and diffraction effects could be ignored approximately estimation of the phase distribution of second-harmonic wave could be done. The far field divergent angle and second moment radius of harmonic wave will vary with the aberration of fundamental wave, but the far field divergent angle will be obviously smaller than that of fundamental wave. The phase distribution of both fundamental and harmonic wave is measured using Hartmann-Shack wave front sensor in the experiment with 1064nm and 790nm lasers, respectively. Results are given.

首次从三维三波相互作用方程组推导得到了位相畸变光束倍频的小信号解；通过建立国防科学技术人学研究生院学位论文三维数值模型，编写相应仿真程序，首次得到了位相畸变光束倍频过程的大量计算结果，深入细致地研究了位相畸变光束经非线性光学频率变换后谐波的转换效率、光强分布、位相分布以及影响它们的各种因素；得出谐波的远场发散角和光斑二阶矩的变化规律会因为基波像差的不同而不同，但谐波的远场发散角明显地比相应基波的小的结论；得到了在走离效应和衍射效应等影响许多因素可以忽略的情况下，位相畸变传递到二次谐波的估算式；举例分析了KDP三倍频方案中，基波位相畸变对二次谐波和三次谐波的影响；实验工作中，用哈特曼一夏克传感器分别对IO64nm倍频过程和790飞秒超短脉冲倍频过程中的基波和谐波的位相分布进行了测量，给出了相应结果。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。