| 1. | It diffracts the diffracted beam which effectively means that it generates an inverse transform .
它对衍射光束再发生衍射，这实际上意味着它产生了一个逆变换。 |
| 2. | Comparison of two numerical simulation methods for hard - edged diffracted beams
两种硬边衍射光束计算模拟方法的比较 |
| 3. | In this thesis , the properties of the free - space propagation and focus were studied when a beam propagates through an axicon
本论文主要是探讨激光光束经过轴棱锥转换后产生的无衍射光束的传输特性和聚焦特性。 |
| 4. | A research on the relationship between the beam parameters in the diffractive field of planar waveguide in te0 mode and the waveguide structure parameters
平面波导基模端面衍射光束参量与波导结构参数关系的研究 |
| 5. | Both the experimental and theoretical results show that the low diffraction beam has great advantages over the gaussian beam in an ablation - dominated material removal processes
发现了低衍射光束比高斯光束在激光消融聚合物材料上具有显著的优点。 |
| 6. | Based on huygens - fresnel diffraction integral theory , the propagation properties of bessel beam were studied in this paper . by using the analyses of geometrical optics , hollow beam are found and the formula of the starting point 、 the end point and the bottle length can be got
论文中,我们基于惠更斯-菲涅耳衍射积分理论研究了由轴棱锥产生的贝塞尔光束的传输特性,并且通过几何光学解析无衍射光束的聚焦特性。 |
| 7. | The main work of this dissertation focuses on the analysis and design theory for a resonator with diffraction optical elements by using a matrix eigenvalue method . the principle and method how to realize a low diffraction beam have been described . both the experimental and theoretical results show that the low diffraction beam has great advantages over the gaussian beam in an ablation - dominated material removal processes
本文的重点是：阐述了利用矩阵本征值方法分析和设计激光谐振腔的系统理论；简述了产生和实现低衍射光束的原理和方法，实验发现了低衍射光束比高斯光束所具有的独特性能；理论设计和研制了衍射光学元件，并通过实验获得空心激光光束，提出了对不同空心光束的描述方法。 |
| 8. | In the experiment , we use the he - ne laser and the semiconductor laser as the source , record the bessel beam patterns behind the axicon by using a digital camera and a microscope , measure the radius of the bessel beam central spot by film - scanning and measure the effect of both the radius of the aperture and the open angle of the axicon on the maximum non - diffraction distance . the experiments show that a specific propagating range has constant power and the beam has a bessel - like distribution in this range . the results agree with the beam corresponding to a diffraction free beam
同时我们还采用胶片扫描的方法测量了无衍射光束的中心光斑尺寸,测量了不同光阑孔径和不同棱角情况下的最大无衍射距离和传播轴附近横截面内微小光孔中的光强,实验结果显示当激光光束经过轴棱锥转换后有一段距离功率变化很小,且分布近似贝塞尔分布,符合无衍射光束的特性;经过聚焦后,呈现三维分布中空的光束bottlebeam ,实验结果与理论分析基本吻合。 |
| 9. | At first , the author analyzed some chief factors such as light beam drift and atmospheric turbulence that affect the precision of the laser collimation in brief . then , the author studied the plan of the laser collimation generating nondiffracting beam and automatic level system with high precision . at last , the author completed the measurement of the straightness guideway by using ccd ( charge coupled device ) as the receiver and computer imaging processing
文章首先简要地分析了激光自身漂移、大气湍流等影响激光准直精度的主要因素，然后对系统的激光准直方案进行论证，并确定了无衍射光束的生成方案、高精度自动安平系统的结构方案，最后以ccd为接收器件，通过计算机图像处理，完成对轨道直线性的测量。 |
| 10. | The cavity mirror can also be designed according to an objective function . the second part ( the 5th chapter ) is to introduce the concept of low diffraction beam and to illustrate the principle and method how to realize it . a low diffraction beam is obtained by reconstructing the existing optical resonator of a co2 laser using a special diffraction phase plate
第二部分(第五章)提出了低衍射光束的概念，简述了实现低衍射光束原理和方法；通过腔内放置衍射元件的方法实现了低衍射光束的输出；并对这种光束进行了理论和实验研究，理论模型结果和实验结果很好地吻合。 |
