热散焦效应；
The conditions of focusing, defocusing and trapping of light beam are given.
给出了光束的聚焦、散焦和陷的条件。
A new synthesis method for synthesizing on-axis flat-topped beams by using a defocusing telescope system;
提出了用平顶多高斯光束作为理想光束和使用离焦望远镜系统合成轴上平顶光束的一种新方法。
Furthermore, the dead region of actual detector will influence defocusing curve and shrinks its dynamic range.
此外，实际的探测器所具有的死区也会影响离焦曲线，同时还限制离焦动态范围。
The performances of all algorithms are demonstrated with a series of images with differentdegree of defocusing level.
本文使用一系列不同程度的离焦图片演示了所有算法的性能。
It's well known that both thermal self-defocusing effect and reverse saturated absorption can lead to optical limiting.
众所周知，热自散焦效应和反饱和吸收效应都能导致光限幅。
To compensate the defocusing of a dual-band aerial camera in a complicated environment, a focusing mechanism is designed.
为了补偿双波段航空相机在复杂环境下产生的离焦，设计了一套调焦机构。
The effects of laser power? speed and defocusing parameter on welding depth and width have been studied in the experiment.
研究了激光焊接输出功率、焊接速度、离焦量等工艺参数对焊接深度及焊接宽度的影响。
The influence of Nd:YAG laser on hybrid weld appearance is light in variation of laser-arc distance and defocusing distance.
而在光丝间距和离焦量变化过程中，激光束对复合热源平板堆焊焊缝表面成形的影响很小。
In the interferogram the fringes either do not appear or appear and have the determined direction when the defocusing is zero.
当离焦量为零时，干涉图上或者无条纹，或者条纹有确定的方向。
The discussion is focused on both self-focusing and self-defocusing medium. Some results with potential applications are given.
针对自聚焦和自散焦介质分别进行了讨论，获得了具有潜在应用价值的结论。
Experimental results showed that reasonable defocusing value should be adopted in order to get better weld seam shaping quality.
结果表明：只有采用合适的离焦量，才有可能获得较好的焊缝成形质量。
Important applications of isotropic nonlinear materials are seen in self-focusing, defocusing phenomena, switching systems, etc.
各向同性非线性材料的重要应用包括自聚焦和散焦现象、开关系统等。
Simulation results show phase-diversity method can accurately retrieve the wavefront and defocusing of one wavelength is optimal.
模拟研究结果表明，相位差法可以较准确的恢复出波前相位，并且最优化的离焦波面差为一个波长。
Under the defocusing structure, a clear clue is running underneath and what's more, an uncertainty is hiding behind the clear clue.
但是在这样散乱的表层结构之下，却流动着一条清晰的线索，更主要的是，在这清晰的线索背后，却隐藏着某种不确定性。
By analyzing the defocusing reasons, a scheme of auto-focusing system was proposed and a simple, reliable focusing gear was designed.
通过对该原因的分析、研究，确定了自动调焦系统方案，设计了一套原理简单、结构可靠的调焦机构。
At the same time we can get the relationship between hollow circular laser beam and duty circle at different defocusing cross section.
同时得出了不同离焦量横截面上中空环形光斑的大小和占空比之间的关系。
The effects of lighting wavelength, coherent coefficient, aperture number and defocusing to image quality can be studied with this method.
用于研究照明波长、相干系数、数值孔径及离焦等对成象质量的影响。
In tills paper, a new imaging formula for a conical defocusing GRIN fiber lens is derived by using the variational method and the ABCD law.
本文用变分法以及ABCD定律，导出了锥形发散梯度折射率纤维透镜新的成象公式。
There is a linear relationship between the shearing fringes appearing inside an interferogram or the direction of the fringes and defocusing.
剪切干涉图中出现的条纹数或者条纹的方向与离焦之间存在着线性关系。
Three dimensional coordination polymers show self defocusing or self focusing effects depending on the valence shell structures of the central ions.
三维结构配位聚合物的自聚焦或自散焦效应主要受中心金属离子价层电子构型的影响。
A linewidth stabilizing method for defocusing laser direct writing is proposed for further improvement of line quality of diffractive optical elements.
为了提高激光直写加工衍射光学元件时的线条质量，提出一种离焦激光直写的线宽稳定方法。
The design principle of this defocusing fiber lens used as laser beam transforming device and application in an expanded beam coupling system are discussed.
探讨这种发散纤维透镜用作激光束变换元件的设计原理以及在望远镜式扩束型光学耦合系统中的应用。
The present research mainly focuses on detecting the processing stability, assembly quality, defocusing, weld penetration, weld shape, pool and keyhole, etc.
目前实时检测的内容主要有焊接过程的稳定性、装配质量、离焦量、焊缝熔深和表面形貌、熔池与小孔的形态等。
Dual waveband signals in high power laser welding were recorded and analyzed, especially, the law between the signals magnitude and the defocusing was discussed.
记录和分析了高功率激光焊接中工作区的紫外和红外信号，着重分析了双波段信号与离焦量变化的对应规律。
To contract the circular beam symmetrically, the co-propagation of the bright and dark beams in three-dimensional self-defocusing media is studied systematically.
为了获得一种对称压缩圆光束的方法，系统研究了三维自散焦介质中亮暗光束对的共同传输。
Relationships between output power of laser diode and optical feedback coefficient, optical feedback coefficient and defocusing amount are numerically investigated.
数值研究了非相干光反馈时半导体激光器输出功率随反馈系数的变化关系以及待测物体离焦量与反馈系数的关系。
Characteristics of the defocusing error signals are expressed in the terms of an off-axial detection system by geometric optics. The results are compared with experiment.
本文用几何光学描述了离轴探测调焦误差信号与系统参数的关系，并与实验结果进行了比较。
This approach can not only eliminate defocusing effect of optical system caused by temperature change, but also make the aerial digital camera be smaller and less weighty.
这种方法既能有效减小光学系统在不同温度下像面的热离焦，又有利于航空相机小型化、轻量化设计。
And it is observed that laser power is the ultimate affection of joint strength, the defocusing amount is the weak influence, and the welding speed between the former affection factor.
进一步分析发现激光功率对接头强度的影响最大，焊接速度的影响仅次于激光功率，离焦量的影响最小。
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