beam divergence

For large probe beam divergence the SNR is relatively poor, and even a streaky signal process is predicted if a point target is scanned across.

系统发射的探测光束发散角较大时，信噪比较差，且光束扫过点目标可能出现条纹状信号过程。

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And the divergence angle of pumping beam and the off axis pumping influenced t.

且泵浦光的发散角和在偏轴方向的泵浦光对参量光线宽的影响较大.

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This paper analyzes the effects of beam divergence, and power transmission on the link range. The results show that it is effective to extend the range by narrower beam divergence and higher detector sensitivity.

讨论了光发射光源的选择、光发射功率、光束发散角以及光学天线结构、探测器灵敏度对通信距离的影响，指出了窄束光发射和提高探测器灵敏度等加大通信距离的办法。

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The output beam divergence and optical power density on facets were reduced effectively by using LOC structure for high power, low beam divergence output.

采用大光学腔结构以有效降低垂直于结平面方向的光束发散角及腔面的光功率密度，实现器件的高功率、低发散角光。

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Compared to the single-mode fiber and multi-mode fiber, collimator has higher parallel light beam, smaller beam divergence ( 0.25 °), longer working distance(~ 10cm) and higher sensitivity coupling efficiency.

与单模或多模光纤相比，光纤准直器的光束平行度更高、光束发散角更小（小于0.25度）、工作距离更长（约10cm）、光束耦合效率对入射角更敏感。

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The on-line measurement system based on OTR can be used to measure the parameters of the intense electron beam, such as beam energy, divergence and emittance, and it has characteristics of ultra-fast response and high special resolution.

基于光学渡越辐射原理的高能强流电子束束流参数在线测量及诊断系统，具有时间响应快、分辨率高的特点，可以测量电子束的束剖面、发射角、能量等参数。

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The pigtail output power of single mode polarization maintaining fiber reached ( 1.5 mW) due to lower vertical beam divergence.

由于器件具有比较小的发散角，与光纤耦合时具有比较高的耦合效率，单模保偏光纤耦合输出功率达到1.5mW。

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The effect of divergence of the incident electron beam on the gain of FEL is analysed.

分析了入射电子束的发散性对自由电子激光器增益的影响.

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The patterns show that divergence of the emerging beam increases with the dihedral angle offset up to completely separate to six beams;

通过衍射图可以看出出射光束的发散程度随着角度误差的增加而增加，直至完全分离成六束光束。

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Exact measurement of the far field divergence of the laser beam using CCD camera

利用CCD准确测量激光远场发散角

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Based on the theory of the second intensity moment, the analytic expressions of the far-field divergence angle, near-field divergence angle, waist width and beam propagation factor of non-paraxial Lorentz beams are derived, and the transform characteristics are discussed.

基于光强的二阶矩理论，得出了非傍轴洛伦兹光束的远场发散角、近场发散角、束腰宽度以及光束传输因子的解析表达式，讨论了它们的变换规律。

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A beam of high radiant power will have high divergence.

高辐射功率的光束会有高的发散度.

In order to make the high power laser beam meet the illumination requirement, the beam divergence always need to be changed.

为了满足大功率半导体激光束在照明领域的应用要求，经常需要对LD光束发散角进行变换。

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