浅谈高职院校激光加工实训教学

本文阐述了开展激光加工实训教学的必要性;结合高职教育的特点,介绍了实际教学当中的经验并对今后的发展作了总结。     

Raman crystal lasers in the visible and near-infrared

Raman lasers based on potassium gadolinium tungstate and lead tungstate crystals pumped bya≈120 ps Nd: YAG laser at 1.064 μm were developed. High reflection mirrors for the Stokes wavelength have been used to generate near-infrared and eye safe spectral region of 1.15–1.32 μm. Second harmonic generation of the generated Raman lasers was observed. Eifficient multiple Stokes and anti-Stokes picosecond generation in 64 crystals have been shown to exhibit stimulated Raman scattering on about 700 lines covering the whole visible and near-infrared spectrum. All stimulated Raman scattering (SRS) wavelengths in the visible and near-infrared spectrum are identified and attributed to the SRS-active vibration modes of these crystals.     

MPEG压缩技术与VCD2.0光盘制作系统在教学上的应用

MPEG是有关图像数据和声音数据的压缩编码技术 ,用该技术发展起来的VCD播放器已大量进入家庭、学校和单位 ,如何将这一先进的设备更好地发挥在教学活动中 ,是摆在我们面前的一项重要任务。本文通过对MPEG压缩技术和VCD2 0光盘制作系统的介绍 ,使读者对VCD2 0在教学活动中使用的情况有一个较深的了解     

基于通讯车图像传输系统--一种基于通讯车的卫星中继遥控机的红外激光全息图像传输系统

基于通讯车的卫星中继遥控机的红外激光图像传输系统在遥感图像的传输中有着极其重要的军事和民用价值。首先讨论系统的应用意义，然后提出系统的总体方案，并对几个关键电路进行设计，最后分析其可行性。     

Influence of Zirconia on Hydroxyapatite Coating on Ti-Alloy by Laser Cladding

Titaniumalloyisakindofdesirablemetallicbioma terialforimplantingandrepairingbodyhardtissuesduetoitsbetterbiocompatibilityandmechanicalproper ties[1,2 ] .However ,itcansuffercertaindisadvantages ,suchaspoorosteoinductive ,andlowcorrosivewearresis tance .So ,itisveryimportanttoimprovethejointprop ertiesbetweentitaniumalloyandhumanbody .Hydrox yapatite(HAP)isknowntobebiocompatibleandtoformadirectbondwiththeneighboringbonesduetoitscrys tallographicalandchemicalsimilaritywithvariouscalci fiedtissu…     

Sagnac效应与激光陀螺

依据相干光学理论,从Sagnac效应出发,分析讨论了激光陀螺的基本原理,并简要的介绍了二频单激光陀螺和四频差动激光陀螺的工程化过程及应用前景.     

激光辐照单晶硅样品的研究

将功率为30W、波长为1064nm的YAG激光束(束斑直径0.045mm)照射在硅样品表面打出小孔,在孔内的侧壁上有很特殊的网孔状结构,其中的网孔壁厚为纳米尺度,解释孔侧壁网孔状结构的机理.孔侧壁上的网孔状结构有很强的受激荧光发光效应,发光峰中心约在700nm处.当样品在加工和检查过程中保持脱氧状态时,其样品几乎没有发光,证实了氧在PL发光增强上起着重要作用.我们用量子受限及其纳晶与氧化硅界面态复合的综合模型来解释其光致发光的增强机理     

激光涂层在多冲碰撞载荷下的变形与失效研究

In applying impact loads with multishocks to perform shock experiments for laser cladded cobalt-base and nickel-base alloy coats on the surface of mild carbon steel or austenitic stainless steel, it is found that, under an impact force that is 11%-43% of the static yield limit of the material, micro-plastic deformation is generated both in the coat and upper part of the base. Repeated trials will cause cumulated macro-plastic deformation. After a total of 250,000 impacts, relative deformation rates of 2.2% and 8.9% result in the coat and base, respectively. Moreover, there is a rigidification phenomenon both in the coat and upper part of the base. When the coat covers the entire base, under impact loads with multishocks, the final stress is less than that when the base is only partly covered, and the life is longer.There is intense deformative rigidification and material floating effect on the lower part of the edge of the covering coat. Meanwhile, cracks are likely to occur and spread in this part.     

基于CDIO教育模式的激光加工教学的实践探索

针对目前我国工科毕业生实践能力和创新能力明显不足这一现状,文章通过激光加工工训教学的改革和成效,从一个侧面佐证了实践教学对工程教育和培养学生创新能力的重要性,提出实施CDIO工程教育模式、改革实践教学方式方法是培养学生具有扎实的专业知识、较强的实践能力和创新能力的有效途径,是工程教育专业认证的需要,也是经济社会发展及参与国际交流的需要,更是实现工程学位国际互认和工程师资格国际互认的需要。     

一种可用于光抽运共振实验的新泵浦源

本文介绍一种可用于光抽运实验的新泵浦源, 该光源具有高稳定、可调节、可调制和多波长范围等特点; 并介绍该源在原子跃迁谱线观测中的一种应用.