激光

By means of high speed gas stream compound with coaxial cutting gas for pulsed Nd:YAG laser on cutting of ceramics,the technological parameters affected on the thickness of re cast layer and the exiting of crack in re cast layer were studied.

针对激光切割陶瓷产生的重铸层和裂纹，设计了超音速喷嘴，采用侧吹高速辅助气流与同轴切割气流复合技术，研究了激光加工工艺参数对重铸层及裂纹的影响规律，开发了获得最小重铸层厚度和裂纹长度的高效率激光切割方

The crystal defect was observed and analyzed. Room temperature Nd:NYW crystal samples sized 3x3x5mm and 5x5x5mm were LD pumped at 808nm plane-concave cavity and double-concave cavity laser systems respectively, 1060-1064nm has been demonstrated.

室温下，分别用平一凹腔系统对尺寸为3×3×5mm的Nd：NYW激光晶体，用双凹腔系统对尺寸为5×5×5mm的Nd：NYW的激光晶体进行连续激光输出实验。

With ns-level response time,the energy meter can record every pulse and its response.

准分子激光是靠放电激发气体而产生激光的，因而在激光脉冲能量控制上是有困难的。

Endoscopic lithotripsy with the Holmium:YAG laser was attempted to treat gastric bezoars in 108 patients with a history of 1～36 months. The sizes of bezoars varied from 3～12cm in diameter.

为探讨钬激光(Holmium：YAG)在胃石治疗中的应用价值及钬激光碎石的具体操作技术要领，1993年11月至1998年1月对108例胃石症患者进行了胃镜下钬激光碎石治疗。

Measurement system for crystal fiber loss has been set up, an idea that single mode quartz fiber acts as the coupler of crystal fiber incident light has been put forward. The propagation loss of the cladded crystal fiber is measured using this measurement system to be 14 times as low as that of the uncladded crystal fiber, and the transmission of low order modes has been realized in the cladded crystal fiber.

利用激光加热基座法生长出了不同直径、不同晶向的LiNbO〓和Nd：MgO：LiNbO〓单晶光纤；根据熔区质量守恒和热量守恒方程解析了生长速度、速度比和激光功率对晶纤内部显微缺陷和直径波动的影响，提出通过控制激光功率和速度比来维持熔区形状的稳定，以实现高品质晶纤的稳定生长。

Laser refabrication is a kind of advanced technology. This paper only carried on the elementary research about 3D coaxial feeding head. Many problems didnt be solved, including development of new feeding device and systems of detecting and controlling.

激光再制造是一门高精尖的技术，本文仅对其中三维同轴送粉工作头进行了初步研究，但还有许多问题需要解决，如适合激光再制造的新型送粉器的研制，激光再制造过程中的多轴联动，智能监控系统等。

After several kinds of laser range finders that currently in use are introduced, whose technological advantages and disadvantages are analyzed, a distance measuring using single-point laser triangulation is proposed.

本文在介绍利用激光进行测距的常用方法及其优缺点的基础上，分析了现有激光测距方法的局限性，从而提出了单点激光三角测距系统。

If the content of SiH〓 kept constant, the laser energy value of threshold that decomposed SiH〓 increased linearly at first, but when the gas flux exceeded 100ml/min, the laser energy value of threshold increased slowly because the coaxial Ar could not"suppress"the reaction flame which leaded to radial dilation of reaction gases and increasing the effective absorption to laser energy.

在反应气体中SiH〓含量不变的情况下，随着反应气体流量的逐渐增加，可以引发硅烷分解的激光能量阈值一开始成线性增加，当流量大于100ml/min以后，由于同轴Ar不能有效的&压住&反应焰，导致反应气体的径向扩张，增加了对激光能量的有效吸收面积，因此激光能量阈值的增加减缓。

The suitability of the different processes was analyzed by observing the weld appearance,studying the microstructure and measuring the mechanical properties of the joint.The results show that a favorable weld can be obtained under the suitable parameters by laser beam welding or tungsten inert gas welding with filler metal.The TIG welded joint has a wider HAZ,and the laser welde...

试验结果表明：在工艺参数合适的条件下，加焊丝TIG焊和激光焊均能获得成形较好的焊接接头；TIG焊接头热影响区较宽，焊缝深宽比小，而激光焊时热影响区不明显，焊缝深宽比大；两种焊接方法所获得的焊缝区组织均为均匀的等轴晶，但激光焊时焊缝组织更细，从而使接头抗拉强度大幅度提高，达到母材的94%左右。

High-order harmonic radiation with noble gas and N〓 in static gas target has been obtained, and the effects on high-order harmonic efficiencies due to laser intensities , polarization, gas densities, confocal parameter, media characteristic and phase mismatch have been discussed. The experimental results show that the high-order intensities grow with the incident laser intensities and gas densities, and high-order harmonic signals amplify in the same time.

高次谐波辐射是强场物理中与电离过程相伴而生另一种重要过程，本文利用飞秒激光在静态气室中获得全部的稀有气体原子以及氮双原子分子5到21次的谐波发射，着重讨论了激光功率密度、激光偏振、气体密度、共焦参数、介质本身以及相位失配对高次谐波转换效率的影响。

For a big chunk of credit-card losses; the number of filings (and thus charge-off rates) would be rising again, whether

年美国个人破产法的一个改动使得破产登记急速下降，而后引起了信用卡大规模的亏损。

Eph. 4:23 And that you be renewed in the spirit of your mind

弗四23 而在你们心思的灵里得以更新