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聚焦轴

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Using the relations between Hermite and Laguerre-Gaussian modes and expanding the window function of two-dimensional rectangular hard-edged apertures into a finite sum of complex Gaussian functions, the propagation of complex- argument Laguerre-Gaussian beams through a paraxial optical ABCD system with a rectangular hard-edged aperture is studied. An analytical propagation equation is derived and used to study the diffraction at the rectangular hard-edged aperture and the focusing properties of complex-argument LG beams.

利用拉盖尔-高斯模和厄米-高斯模的变换公式,并使用将二维矩孔光阑窗口函数展开为有限个复高斯函数之和的方法,得到了复宗量拉盖尔-高斯光束通过含矩形硬边光阑近轴ABCD光学系统的变换的解析传输公式,并对复宗量LG光束通过矩形硬边光阑的衍射和聚焦特性进行了研究。

The present invention is a fiber optic waveguide adapted for focusing a beam of light at an obtuse angle to the optical axis.

本发明涉及一适用于将光束以钝角聚焦到光轴上的光纤波导。

A new scheme for laser beam focus position error compensation is proposed, In this scheme, a decomposing compensation scheme, the compensation action along laser beam is decomposed to three orthogonal straight-line coordinates: X、Y、Z, without extra actuator.

论文提出了一种新的激光焦点位置误差补偿方案,该方案不需要专门的执行机构,而是将激光聚焦头沿着光轴方向的补偿运动分解到机床的X、Y、Z三个直线运动座标上,称为分解补偿方案。

It is found that imaging by the system is nonlinear duing to SMF,illumination system and reception system both affect the sum optical signal intensity,and optical sectioning strength of the system is depended on prober and SFM.

根据透镜成像规律和单模光纤的传输特性,获得基于单模光纤的共聚焦内窥成像系统轴向光强分布,发现系统的成像过程由于单模光纤的介入呈现非线性,照明光路系统和接收光路系统仅影响系统接收信号的总强度,系统层析能力取决于探头和单模光纤性能。

Especially for kw_0≥30, the results coincide with each other verywell. By expanding the exact solution, it can be seen clearly that the zeroth order term is just the paraxial one, so the paraxial approximation field is good enough to replace the exact field when the beam width is large to some extent.

结果表明对于腰宽仅有几倍波长的强聚焦高斯光束,低相速度区仍然存在,并且低相速度区分布的规律与近轴近似场结果在本质上是一致的。

The computation analysis indicates that increasing the aperture of the concave focusing transducer, decreasing it's geometric focal length or raising it's central working frequency can improve the transverse and axial resolutions of the system simultaneously, but changing the dividing proportion of the transducer affects the two kinds of resolution differently. On compromisingly considering several factors including the exciting mode, the focusing ability and the radiation force effect, the concave focusing transducer should be divided into two equal-area parts.

计算研究表明:增大凹球面换能器的口径、减小几何焦距和提高中心频率均可以提高系统的侧向分辨率和轴向分辨率;但改变凹球面换能器的分割比例对两种分辨率影响不尽相同综合考虑超声换能器激励、聚焦性能以及产生的辐射力效果等因素,则换能器应按等辐射面积原则分割为宜。

The results show that the microsphere located in a certain zone of focused laser optical electromagnetic fields will be trapped, and the trapping force deceases with the increase of the distance of the observed point away from the axis.

结果表明:位于聚焦光场中特定位置的微球可被俘获,当离轴距离增加,俘获力减小。

The z-axis anisotropic dielectric layer focusses an electric field at each of the electric field sensing electrodes.

所说Z-轴各向异性介电层将电场聚焦到各个电场检测电极处。

The experimental result shows that eEndoscope-based speckle quasi-confocal system has the quality of axial optical sectioning.

实验结果表明内窥式散斑类共聚焦系统具有很好的轴向层析能力。

Beside, the DVD-ROM drive use the FE signal to compensate the axial wobble (CD:±500μm, DVD:±300μm) which are caused by the rotating disk. The gain signal of the plant will be corrected during the automatic adjustment procedure when the DVD-ROM drive is starting.

此外,光碟机利用聚焦误差信号来补偿盘片旋转所造成的轴向偏摆(CD:±500um、DVD:±300um),其信号增益值在光碟机启动时的自动调整程序里进行校正。

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