激光

ABSTRACT The development history and current research state of pulsed discharge-excited alkaline-earth Metal Vapor Lasers were reviewed in detail in the paper. After all those multi-mechanism lines region from ultraviolet to infrared had been successfully obtained in our experiments, a consistent model has been build up for longitudinal pulsed discharge excited He-Sr vapor laser.

详细评述了脉冲放电激励的碱土金属蒸气激光的发展历史和现状，在实验上成功实现碱土金属多种机制从紫外到红外的多条激光谱线后，对纵向脉冲放电激励的He-Sr蒸气激光建立了一个完善的、自恰的激光动力学模型。

The pulse width broadening of the femtosecond laser after angular dispersion wasdescribed,the pulse width expression at arbitrary propagation distance was provided,the pulse width broadening of the femtosecond laser by AOD was precisely predicted,thegeneral theory on pulse width broadening of plane wave,spherical wave and Gaussianbeam was deduced and the physical mechanism of pulse width broadening based on eachabove light beam model was revealed.

本文对随机扫描双光子显微镜中飞秒激光传输特性进行了系统深入的研究，完整解决了这一理论问题，发现了空间与时间色散通过角色散耦合的规律，为空间与时间色散同时补偿的方案提供了理论依据，基于此原理的单个角色散器件同时补偿空间和时间色散的方案高效解决了声光偏转器的色散补偿这一核心难题，为建立随机扫描双光子显微成像装置并应用于神经学研究奠定了基础：阐明了飞秒激光经角色散后的光斑展宽规律，获得任意传输距离处的光斑解析式，精确预测了声光偏转器对飞秒激光的光斑展宽，并揭示了光斑展宽的物理机制。

The mechanical property testing shows that the seamless PLLA tubes perform excellent radial strength,which indicates that the mechanical properties of biodegradable stents made of these tubes was supposed to be excellent.PLLA and its composites were first used in preparing seamless tubes as antecedency of laser-cut biodegradable coronary stents in china.Finite element analyses of the biodegradable coronary stent model indicate the explorative design basically meets the requirement of reasonable and applicable stents.There is not such kind of research yet in domestic.Optimum laser-cuttting parameters of CO2 laser was cauculated based on experiential formula,within it,biodegradable coronary stents,especially those with complex structure would be manufacutured from seamless tubes quickly by laser microprocessing with high consistency to the design model.The processing efficiency of the CO2 laser demonstrated in experiential formula by us will play an important guiding role in manufacturing biodegradable stents by laser-processing.Our stents that ascribed to laser-cutted,slotted tube stent are proved to be biodegradable, self-expandable and good biocompatible,basically reach the international level on the aspest of manufacturing procedures and design.

研究结果表明：壳聚糖改性材料综合性能优于纯PLLA，更适合于作为可降解冠脉支架的原材料；自主设计的探索性自膨胀管状闭环型可降解冠脉支架的性能符合冠脉设计要求，设计、验证生物可降解冠脉支架模型的研究在国内还未见报道；制备的改性PLLA无缝管的力学性能优越，可通过激光切割获得冠脉支架，这是国内首次采用聚乳酸材料来制备通过激光加工出可降解冠脉支架的无缝管；二氧化碳激光器加工精度能达到加工要求，加工出来的血管支架名义设计与实测值误差小，实现了冠脉支架、尤其是带有复杂外观设计冠脉支架的快速化、规范化加工，对二氧化碳激光器加工聚乳酸材料的效果研究在国内外属于首创，获得的经验公式对日后的深入研究有重要的指导意义；制备的支架为激光切割管状闭环型冠脉支架，支架外观设计、支架加工手段、支架的性能都基本接近国际水平，支架样品符合设计的理念，可以实现自膨胀功能。

Taking the laser diode line generator as the light source, the parallel laser screen unit was formed by using aplanatic cylindrical Fresnel lens with long focal length. By splicing seamlessly with multiple parallel laser-screen units, the large area laser screen can he constructed.

以半导体激光线发生器为光源，用长焦距消球差的柱面菲涅耳透镜形成平行激光幕单元，通过多个平行激光幕单元的无缝拼接可形成大面积靶面。

A high-powered infrared autocollimator is adopted to ensure 2 of spatial resolution, a 15GHz oscilloscope is used to capture the laser pulse as narrow as 100ps, and an accurate laser power meter with large dynamic range is used to obtain accurate energy measurement of the laser pulse.

通过引入红外自准直仪使系统的角分辨率达到了2，借助示波器捕获窄达100ps的激光脉冲，高精度、大动态范围的激光能量计可精确测量出激光的能量。

The primary principle of micro-impulse measurement using laser interferometry is described, and impulse can obtained by measuring tiny vibration of ballistic pendulum.

对激光干涉仪测量微冲量的原理进行了初步研究，将激光与靶材相互作用产生的微冲量转化为冲击摆的微幅振动，通过激光干涉仪辨识此振动以获得冲量。

For the laser coordinate measuring machine, the single CCD and the structure light are used to match the 3D object surface data. A new ladder-shaped calibration block is designed and two images are taken: one is structured stripe image and the other is laser plane image by this block. The laser plane and camera calibration can be accomplished by both images.

由于关节式坐标测量机的激光测量头，使用单摄像机和线结构光来匹配被测物体表面的三维数据，本文设计了一种新型的阶梯形标定块，通过标定块图像和激光条纹图像完成了摄像机的内外参数标定和激光平面参数标定。

Firstly, some fundamental knowledge, such as the describing of laser field, the Kind of electron-atom scattering in a laser field, and so on, are introduced. Then a compution method which is called the Second-order Born approximation and is used to calculate the cross section of electron-atom scattering in a laser field, is provided.

本文首先介绍了激光场的描述、激光场中电子—原子散射的分类等相关理论，接着详细描述了一种计算激光场中电子—原子散射截面的方法——二阶玻恩近似理论。

This paper direct three primary colors solid state lasers which are as the light source,spectroscopes which are used to produce color beams of light,two galvanometers systems which are used to scan.

针对以三基色全固态激光器作激光光源，以分光镜作为混色方法，以双振镜系统作为激光光束扫描装置的激光扫描系统为对象，主要研究了激光光束扫描方法与显示分辨率的关系，提出了一种全新的扫描方法，闭合路径扫描法，并给出相应的硬件控制器设计。

The design principle of the laser receiver with wide FOV for the laser command guidance and laser-beam riding guidance is introduced. A mathematic model of receiving light field is presented. The formula for the viewing angle of the detecting optical system was derived according to the diffraction light field of the oblique incidence parallel light. Taking a detecting optical system with the collecting objective for example, the design characteristic that the receiving optical system needs not only an extra large relative aperture but also an unvignetting receiving performance is discussed on the premise of meeting the requirement of 1064nm WFOV laser receiver.

介绍激光指令制导和激光驾束制导的大视场激光接收机的设计原理，给出接收光场的数学模型，由斜入射平行光的衍射光场推出探测光学系统的视场角公式，根据1064nm大视场激光接收机技术要求，以聚光物镜型探测光学系统为例，探讨接收光学系统既须具备特大相对孔径，又须具备无晕接收性能的设计特点，采用窄带干涉滤光镜进行光学滤波降噪。

But we don't care about Battlegrounds.

但我们并不在乎沙场中的显露。

Ah! don't mention it, the butcher's shop is a horror.

啊！不用提了。提到肉，真是糟透了。