掺钛蓝宝石激光晶体中夹杂物的分析

本文用大视场光学显微镜、电子探针观察和分析了掺钛蓝宝石激光晶体中夹杂物的形状、尺寸大小及元素组成，并提出消除和减少这些夹杂物的方法．     

连续运转的掺钛蓝宝石激光器

本文报导一种连续波氩离子激光泵浦的掺钛蓝宝石激光器。在氩离子激光功率(全谱线)为10.45瓦且仅用一组腔镜时,获得最大平均功率超过1000mW、调谐范围750～850nm的掺钛蓝宝石激光输出。     

The effect of GaN and ain buffer layers on GaN film properties grown on both C-plane and A-plane sapphire

This paper presents a comparative study of the properties of GaN grown by organometallic vapor phase epitaxy, using both a GaN and A1N buffer layer, as a function of sapphire orientation (c-plane vs a-plane). Results are presented for varying the thickness of the buffer layer, varying the growth temperature of the GaN film, and also varying the ammonia/trimethylgallium mass flow ratio. The electron Hall mobilities of GaN films grown on an A1N buffer layer were, in general, higher compared to films grown using a GaN buffer layer. In addition, growth on a-plane sapphire resulted in higher quality films (over a wider range of buffer thicknesses) than growth on c-plane sapphire. The room temperature electron mobilities were also found to be dependent on, not only the growth temperature, but also the ammonia/trimethylgallium mass flow ratio.     

可调谐的双波长钛宝石激光器

一台可调谐钛宝石激光器两个波长同时运转,在数ns以内同步,相对波长差最大可达55nm。观测到明显的两种波长激光的竞争和关联。由BBO实现了两波的和频与倍频。     

蓝宝石光纤温度传感器测温上限的瓶颈分析及解决方案

通过与热电偶、非接触式辐射测温仪的对比分析,指出基于黑体辐射原理的蓝宝石光纤温度传感器在某些特殊测温场合的不可替代性.介绍了国内蓝宝石光纤温度传感器的研究情况,分析制约其应用和发展的测温上限瓶颈,最后提出解决该问题的初步方案.实验证明该方案能够实现高达2 700℃的温度测量,1 000℃以上最大稳态误差不超过50℃.     

Formation mechanism of subtrenches on cone-shaped patterned sapphire substrate

In this paper, the cone-shaped patterned sapphire substrates (PSS) were etched by an inductively couple plasma with BCl 3 as the reacting gas. The influence of the operating pressure and the RF bias power on subtrenches of the cone-shaped PSS and the formation mechanism of subtrenches were investigated. The profiles of patterns were characterized by FESEM (field emission scanning electron microscope). It showed that the subtrench size varied with the operating pressure and the RF bias power. As the operatin...     

SAPMAC法蓝宝石单晶的生长、检测与超声震动加工

分析SAPMAC法生长大尺寸蓝宝石晶体的工艺技术,并对制备的晶体质量进行了检测与分析.研究结果表明:采用SAPMAC法生长的蓝宝石晶体结构完整,FHWM值很小,只有11arcsec;缺陷密度在102/cm2水平,纯度高于99.995%,常温下晶体在3～5μm波段红外透过率高于85%;用超声振动加工技术对大尺寸蓝宝石单晶进行加工,设计了专用金刚石磨削复合刀具,提高了加工效率.     

蓝宝石高温光纤压力传感器的设计与仿真

针对高温环境下压力测量需求,提出采用蓝宝石材料来构造适用于特殊环境下的光纤高温法珀压力传感器。基于圆形膜片压力敏感原理设计了传感器敏感单元结构尺寸,通过Comsol有限元软件建立了敏感单元模型,对敏感膜片的表面位移及应力分布情况进行了仿真,验证了传感器设计的可靠性;同时分析了传感器的温敏效应,结果表明随温度升高,传感器的灵敏度会增大,会对压力测量产生误差,约为1.51kPa/℃,上述结果为蓝宝石高温压力传感器的结构和性能优化设计提供了有效指导。     

蓝宝石晶片纳米级超光滑表面加工技术研究

本文提出以蓝宝石塑性磨削和化学机械抛光为主要手段，以原子力显微镜为主要检测工具，来制备满足光电子领域要求的纳米级超光滑蓝宝石晶片的新方法。在高刚性磨床上，用W7的金刚石砂轮以f=1μm／r进给量，实现了蓝宝石晶片的浅损伤塑性域磨削。配制了以SiO2溶胶为抛光料的监宝石晶片专用抛光液，稳定地获得了无损伤层的RMS小于0.2nm的超光滑蓝宝石晶片表面。GaN外延生长所需蓝宝石晶片的合理抛光参数是：SiO2的粒子直径为7nm、浓度为3％、pH=11、压力P=200Pa。