光束

Base on the fact that a hard-edge aperture function can be expanded into a finite sum of complex Gaussian functions, the approximate analytical expressions for the propagation characters of Hermite-Guassian beams passing through double rectangular apertured are derived. The approximate analysis uses Collins formula. At last, Matlab illustrates some numerical examples.

基于硬边孔函数能拓展成一组有限复高斯函数的和，研究厄米－高斯光束通过双矩孔的传输特性，用Collins公式分析，用Matlab进行一些数值模拟。

In order to study the propagation of partially coherent modified Bessel-Gaussian beams passing through a paraxial ABCD optical system with hard-edge aperture,the approximate analytical propagation equation was derived with the hard-edged aperture function expanded into a finite sum of complex Gaussian functions.

为了对部分相干修正贝塞尔－高斯光束通过有硬边光阑近轴4BCD光学系统的传输进行研究，采用将硬边光阑窗口函数展开为有限个复高斯函数之和的方法，得到了近似的解析传输公式。

The propagation equations for oblique and off-axial Gaussian beams passing through cat-eye optical lens are deduced by using the theory of matrix optics and expanding the aperture function into a finite sum of complex Gaussian functions.

运用矩阵光学理论以及将硬边光阑窗口函数展开为有限个复高斯函数之和的方法，进一步推导了倾斜离轴高斯光束通过猫眼光学镜头的解析传输公式，通过数值计算分析得到了倾斜系数和离轴量对猫眼效应反射光光强分布的影响规律。

This paper provides an overview of status about laser beam shaping at home and abroad. The theory of beam shaping transformation, including geometric optics and matrix optics, is presented.

本文综述了国内外对于半导体激光束整形技术的研究现状，阐述了研究光束整形变换的理论方法，主要包括几何光学、矩阵光学。

Gaussian beam propagation thus bridges the gap between geometric and physical optics.

高斯光束传播理论因此可以沟通几何光学与物理光学。

Finally, we analyzed the coupling efficiency of laser beam to multimode fiber, using geometrical optics approach and overlapping integral theory respectively.

论文的最后利用几何光学方法和重叠积分的方法分析了激光光束到多模光纤耦合效率的问题。

In this paper,the application of differential geometrical methods in the study of o...

本文介绍了光束传输以及原子束在激光场中受控运动研究中微分几何学的应用，给出了这两种问题的相似性及其应用微分几何学方法进行研究的理论框架和应用举例，并与以往的研究结果进行了比较，证明了这种方法的可行性及其优点。

And this phenomenon originates in the difference between the group velocity and the phase velocity in UPHGB.

并用脉冲光束的群-相速度差对这一现象进行了解释。

The principle of the reference line design is based on the precise guide rail. The laser beams of the couple lasers should be aligned.

设计的原理是以精密导轨作为直线基准，成对的二支指示激光器发出的指示光束应成一直线。

A dental laser shines a powerful beam through a fiber-optic cable connected to a hand piece resembling a standard drill.

医牙激光通过连在手上类似一个标准牙钻的东西上的光导纤维索而发射出强大的光束。

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％。