激光

A numerical model was established by combining the seven-flux model of light propagation with the two-dimensional hyperbolic heat conduction model in cylindrical coordinates. It showed that there exists a great discrepancy between the results obtained by treating the laser irradiation as volumetric absorption (i.e. taking laser scattering and absorption into consideration) and those obtained by treating the laser irradiation as the second boundary condition.

将激光传输的七流模型与圆柱坐标系内的二维双曲型导热模型相结合建立了理论模型；将激光照射处理为容积吸收(即考虑激光在生物组织中的散射和吸收)所得到的计算结果，与将激光照射处理为第二类传热边界条件所得到的计算结果相比，两者差别很大；考察了激光照射下散射系数和吸收系数对生物组织内双曲型导热的影响。

Experiments have been performed using ultra-short (30fs) ultra-intense laser pulse(up to 1018W/cm2) focused into under-dense plasmas(ne＜1020/cm3). A 2ω0 probe pulse was used for the shadowgraphy and the investigation on the propagation of laser under various condition was presented.

开展超短超强激光与次稠密等离子体相互作用实验，采用探针光对激光等离子体相互作用区域进行阴影成像，研究了不同激光功率与临界功率比值及不同激光脉冲长度与等离子体波波长比值下的激光在次稠密等离子体中的自聚焦传输。

Main products of Sunic Photoelectricity: Laser marking machine, Pneumatic marking machine,Laser cutting machine,Laser engraving machine,Laser scribing machine,Laser snick machine,Full sets of solar equipment series etc up to 30 kinds of products. they are widely applied in the fields of solar energy,aero-space and electron, spare parts of automobile, hardware, food and medicine, medical instrument, advertisement and clothes, printing and packing, arts and crafts and so on.. Among them, YAG laser scribing machine have supply the gap in China and substitutes the imported goods, it has taken up more than 85% market share in China and has been appointed the product of foreign-aid project of CCPIT (China Council for the Promotion of International Trade).

三工光电主要产品：激光打标机系列、气动打标机系列、激光切割机系列、激光雕刻机系列、激光划片机系列、激光刻膜机系列、太阳能成套设备等三十多种产品，广泛应用于太阳能、电子元器件、汽车摩托车零配件、航空航天、五金机械、工具量具刃具、水暖洁具、食品医药、医疗器械、化妆品、印章、广告、皮革服装、印刷、包装、装潢、工艺品等领域。

BSpatial characterization of laser induced Cu plasma in air with different laser focusing distancesThe plasma spectra induced by pulsed laser ablation of copper target are measured. By adjusting the distance of the len-sample, the spectrum of air spark plasma、 Cu plasma and the reciprocity of both plasmas are analysed. From the result, it has been shown that the focusing of the laser beam has an important infunence to analyse the properties of the sample.

b 不同的激光焦点位置产生的等离子体光谱的空间特性研究激光烧蚀置于空气中的Cu靶产生等离子体，通过调节透镜与Cu靶的距离，本文观测了激光烧蚀空气产生的空气火花等离子体、激光直接烧蚀铜靶产生Cu等离子体以及空气火花等离子体与Cu等离子体相互作用等不同情况下的激光诱导击穿发射光谱，激光束焦点的位置在分析材料性质的过程中有着重要的影响。

A simplified model which considers the partially ionized plasma as hydrogen-like ions is presented. Classical electrodynamics theory is employed to study the action of ponderomotive force on bound electron and the effect of ponderomotive force on the generation of laser plasmas. A relation between generation of laser plasma and laser wave train length is obtained.

通过建立简化的物理模型，即将部分电离的等离子体简化为类氢离子，使用经典电动力学理论，研究激光有质动力对束缚电子的作用；讨论了激光有质动力对激光等离子体产生的影响；得出了激光等离子体的产生与激光波列长度的定量关系。

Results 15 eyes of peripheral retinal dry hole and peripheral retinal degeneration were treated only by laser treatment and successful rate was 100%;10 eyes with local rhegmatogenous retinal detachment,were initially treated with herbal dehydrant,followed by laser treatment and successful rate was 80%;2 eyes failed due to the traction of vitrous were successfully treated with the aids of local pad;141 eyes with retinal detachment were treated by scleral buckling combined with krypton laser and success rate was 96.5%,5 eyes failed due to the traction of vitrous were successfully treated with the aids of vetroretional operation;27 eyes with complicated retinal detachment were treated by vetroretional operation,followed by intro????and post????

结果 视网膜周边干性裂孔和视网膜周边变性单纯用氪多波长激光治疗15眼，成功100%；局限性孔源性视网膜浅脱离10眼，先使用脱水剂、卧床休息、单眼加压包扎等措施，而后行激光治疗，成功率80%，2眼因玻璃体有牵引结合局部垫压术后成功；巩膜外扣带术后激光封孔141眼，成功率96.5%。5眼因玻璃体有牵引行玻璃体手术后眼内激光封闭裂孔成功；复杂性视网膜脱离经玻璃体切割手术，术中及术后激光封闭裂孔27眼，成功100%。

Results 15 eyes of peripheral retinal dry hole and peripheral retinal degeneration were treated only by laser treatment and successful rate was 100%;10 eyes with local rhegmatogenous retinal detachment,were initially treated with herbal dehydrant,followed by laser treatment and successful rate was 80%;2 eyes failed due to the traction of vitrous were successfully treated with the aids of local pad;141 eyes with retinal detachment were treated by scleral buckling combined with krypton laser and success rate was 96.5%,5 eyes failed due to the traction of vitrous were successfully treated with the aids of vetroretional operation;27 eyes with complicated retinal detachment were treated by vetroretional operation,followed by intro-and post-operation,and success rate 100%.

结果 视网膜周边干性裂孔和视网膜周边变性单纯用氪多波长激光治疗15眼，成功100%；局限性孔源性视网膜浅脱离10眼，先使用脱水剂、卧床休息、单眼加压包扎等措施，而后行激光治疗，成功率80%，2眼因玻璃体有牵引结合局部垫压术后成功；巩膜外扣带术后激光封孔141眼，成功率96.5%。5眼因玻璃体有牵引行玻璃体手术后眼内激光封闭裂孔成功；复杂性视网膜脱离经玻璃体切割手术，术中及术后激光封闭裂孔27眼，成功100%。

A pivotal problem to recognize of the precise position of laser facula has been solved in the process of design work: Firstly the method of background-subtraction is used to eliminate or weaken the affect of background light. Secondly the image threshold segmentation operation and morphologic operation are used to locate the sketchy position of laser facula ; Then the new method of Extracting Edge are designed based on character of laser facula , by using this method in the search area the edges of laser facula can be extracted effectively; At last the optimum picture of laser facular is selected by using the triggering function of hardware and function of software. The exact result can be obtained only by image processing to optimum picture.

在设计过程中解决了精确确定激光斑中心位置这一关键问题：首先利用减背景法，消除或减弱背景光的变化对确定激光光斑中心的影响；再对减完背景后的图片进行阈值分割和二值化处理以确定激光光斑的粗略位置；根据本文激光光斑的特征，设计了一个有效的边界提取算法，对指定区域进行提取激光光斑边界操作，精确的确定激光斑中心位置；最后利用硬件的触发功能和软件编程实现了激光光斑最佳图片的判读，只有对最佳图片进行图像处理得到结果才是准确的。

ABSTRACT In this paper, some problems in harmonic free electron lasers and plasma wave wiggler FELs are investigated. The applications of FEL in material science are discussed in detail. As an example, KrF excimer laser was used to investigate the a-Si: H thin film solar cells instead of the free electron laser.

本论文对适用于应用的谐波自由电子激光和等离子体波泵Wiggler型自由电子激光中的若干问题进行了研究，对自由电子激光在材料科学领域的应用及应用前景进行了详细讨论，并使用KrF准分子激光器代替自由电子激光进行了模拟自由电子激光对α-Si〓H太阳能电池的改性实验。

In the rabbits, every Nd: YAG laser iridotomy smaller than 200μm and argon laser iridotomy, Nd: YAG laser combined with argon laser iridoto- my smaller than 450μm closed by the first postoperative week. The mecha- nism for iridotomy closure was assumed to be iris pigment epithelial prolifera- tion, migration and the reformation of stromal connective tissue once the pos- terior pigmented cells have initially bridged the iridotomy.

四、兔眼虹膜激光损伤后的修复能力较强，小于200μm的Nd：YAG激光孔及小于450μm的氩激光、Nd：YAG激光联合氩激光孔均在术后1周内关闭，前者以基质胶原结缔组织再生较明显，而后者以色素上皮增殖、迁移为著。

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。