几种新型LD泵浦Nd∶YAG双频激光器

介绍了几种LD泵浦Nd∶YAG双频激光器 ,均应用双折射原理实现。一类是利用自然双折射效应 ,在激光谐振腔内加入自然双折射元件 ;另一类则是对YAG晶片加压力 ,使YAG晶片本身成为应力双折射元件。由于双折射效应使激光在谐振腔内产生偏振方向互相垂直的寻常光 (o光 )和非寻常光 (e光 )两种成分。因为o光和e光在双折射元件中有着不同的折射率 ,因此一个激光谐振腔变成了具有两个物理长度的谐振腔 ,从而产生双频激光。改变自然双折射元件或对YAG晶片施加的压力 ,可调谐频差。实验中获得 10 9Hz量级的大频差 ,合成波长可到几十毫米 ,适用于绝对距离干涉测量     

A Novel Tunable Dual-frequency Laser with Large Frequency Difference

This paper proposed a novel tunable dual frequency laser with large frequency difference,which used LD to pump the Nd∶YAG microchip in the end surface and put the liquid pressure on the radial direction of the crystal by a pressure-transporting thin film. As a result of the stress birefringence, there was a mode splitting phenomenon of the microchip laser longitudinal mode. Both theoretical analysis and experiments indicated that there is a directly proportional relation between the frequency difference and the pressure, so the tunable frequency difference could be obtained when the pressure was changed. A large frequency difference of about 3.4 GHz with linear tunable relation was achieved in the experiment,so it can be a practical light source for the absolute distance interferometry.     

A Novel Tunable Dual-frequency Laser with Large Frequency Difference

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多种仪器方法综合分析天然沸石矿

利用现代分析技术对江苏镇江产的天然沸石的组元、成分、结构特征及微观形貌等基本特征进行了系统测定和分析,为镇江天然沸石综合开发利用提供了基础理论依据。X射线衍射法及X射线荧光光谱法分析结果表明,沸石矿主要是由斜发沸石构成,SiO2和Al2O3约占总量的90%,其中SiO2含量在70%以上,Ca的含量高于国内其它斜发沸石。傅里叶红外光谱、扫描电镜分析结果显示其具有独特的筛分、阳离子交换和吸附性能及典型的黏土矿结晶习性;比表面积测定结果表明,江苏镇江沸石与土耳其斜发沸石相比具有更强的筛分能力。综合分析结果表明,江苏镇江沸石矿可以作为环境修复和环境净化材料,具有广阔的应用前景和开采价值。