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By using ABCD law, considering laser medium as lenslike medium , we analyzed a four-mirror folded cavity used for LD side-pumped Nd:YAG laser was analyzed, especially discussed the relationship between the fundamental mode radius or fundamental mode volume and the pumped power in the laser medium.

运用ABCD传输矩阵理论，把增益介质作为类透镜处理，对LD侧面泵浦地Nd：YAG激光器四镜折叠腔进行了分析，特别讨论了增益介质内部基模光斑半径和基模体积随泵浦功率变化的关系。

The laser-cladding layeron the alloy consists of matrix phase of over-saturation solid solution γ and complexhexagonal carbide M_7C_3. Under certain condition, with fast laser scanning speed, the oversaturation solubility of elements increases in γ, and the precipitation of the complexcarbide M_7C_3 decreases, so that the microhardness increases and the wear resistance de-creases. But at slower laser scanning speed, more complex carbide M_7C_3 may precipitate, andthe wear resistance may be improved. Therefore, it is believed that the principal factor in im-provement over wear resistance is the precipitation of carbide M_7C_3, while overmicrohardness is the over-saturation solubility of elements in matrix phase.

表明：(1)激光熔覆合金层是由过饱和的γ基体相和复杂的六方M_7C_3碳化物相所组成(2)在其他参数不变的情况下，随激光扫描速度的提高，γ基体相过饱和度增大，而析出的碳化物含量减少，因而合金层的硬度升高，耐磨性有所下降；而降低激光的扫描速度，碳化物M_7C_3析出增加，有利于提高合金层的耐磨性、因此碳化物M_7C_3析出量是提高耐磨性的主要因素，而增加基体相γ的过饱和度则是硬度提高的主要因素

Contrast to other pulse laser lithotrities, which ground on photomechanical effects, such as laser induced plasma and cavitations, Cr,Tm,Ho:YAG laser lithotripter has many advantages. It will be an important therapy to the ureteral calculi.

相对于其它利用激光诱导等离子体及空化作用等光机械效应碎石的脉冲激光碎石机，钬激光碎石机具有较大的优势，必将成为输尿管结石的一种重要的治疗手段。

When the peak intensity of the laser pulse exceeds the relativistic laser intensity, the electric field parallel to the propagation direction of the laser will emerge by rather large amplitude under the effect of the ponderomotive force.

激光的有质动力加速是指当激光强度大于相对论光强时，除了电子的横向振动，激光的振荡电场在有质动力的作用下将产生极大的沿激光传播方向的分量。

Ponderomotive force of laser beam propagating in plasma could become stronger as the intension of laser beam strengthening , and in fluid mechanics ponderomotive force is related to implicate term, so implicate term could become stronger as laser beam's strengthening and couldn't be ignored.

当在等离子体中传播的激光脉冲达到一定强度时，有质动力会变得比较强。而在流体力学方程中有质动力一项与牵连项相关。因此当激光达到一定强度的时候，流体方程中的牵连项也会变得比较强，不可以被忽略。

HUAMEI company was founded in 2002 with registered capital of RMB2,000,000.We are the biggest professional high-tech company speicilize in the development,produce,sales and service of the laser medical equipments in the area of East China.Our quality products are hot selling items both in domestic and some southeast asian countries as Japan,Korea etc.We enjoy sound reputation in the medical beauty field for our durable machines and good service.successfully develop the E-ROSE series of high-tech beauty equipments as IPL skin softer;IPL hair removal;IPL wrinkle smoother;Laser body slimer;Laser pigment curer etc.

潍坊华美电子有限公司创建于2004年，注册资本200万，是华东地区规模最大的从事激光医疗设备研发、生产、销售、服务为一体的高科技公司，产品畅销国内、日本、韩国等东南亚各个国家，在医学美容领域享良好声誉，公司精心研发了伊露姿系列光子嫩肤仪、光子脱毛仪、光子深层除皱仪、激光纤体仪、激光色素治疗仪等高科技美容器械，公司产品广泛应用于各大中型医院、专科医院的皮肤科、整形美容科、专业美容院，深受广大客户和患者的欢迎。

Technology of laser hardening surface of diesel locomotive camshaft using austenite-bainite nodular-iron instead of 20Cr has been systematically elaborated on,which includes a series of measurements such as mechanism of choosing austenite-bainite nodular-iron and it's pretreatment,ascertaining laser technological parameter,spiry laser scanning strip,designing four-motor control devise using microcomputer and so on.

阐述用奥贝球铁代替 2 0Cr制造内燃机车凸轮轴的激光表面强化的工艺过程，其中包括奥贝球铁的选择、激光工艺参数的确定、螺旋激光扫描带、四联动微机控制装置的设计等。研究表明，用奥贝球铁代替 2 0Cr制造凸轮轴，经激光表面强化后，能获得更均匀的硬度分布和更高的硬度值。

Objective To compare the postoperative visual quality after: laser in situ keratomileusis, laser-assisted subepithelial keratectomy and epipolis laser in situ keratomileusis.

目的 比较LASIK，LASEK与Epi-LASIK 3种不同的准分子激光手术术后患者视觉质量的差异。

This study used the pick-up head from the commercial DVD-ROM as the basis for optical path, and drilled a 2mm hole on the focusing object lens. After combined with the design of a beams plitter, the laser beam source of the two DVD formed two in-line laser beams. One laser beam passed through the undrilled part, and focused on the surface of the object to be tested, in order to measure the displacement variance of the surface.

於三自由光学测探头的研制上，则将DVD 探头之聚焦物镜做一2mm 的穿孔，於搭配一分光镜的设计后，使个DVD 的光源形成同轴光束，将其中ㄧ光束经由聚焦物镜未穿孔部分，聚焦於待测物表面，用以测待测物表面的位移变化，另一光束则穿透过聚焦物镜穿孔部分，直接将光束投射至待测物表面，作为待测物表面之个角的变化测。

Base on the design of the current laser energy meter, laser materials with better transparence, thicker absorbing layer and thermal sensitivity surface unsusceptible to damage were chosen, the temperature sensor and the digital processing circuit in the energy meter were redesigned to meet the requirements of laser energy metrology in field.

在现有激光能量计的基础上，通过选择相对透明、吸收层相对较厚、热敏面不易损伤的激光吸收材料，对激光能量计内置温度传感器及数字处理电路进行了重新设计，满足了不同温度条件下现场能量测量的需求。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。