SiO2-GeO2薄膜二次谐波产生的稳定性研究

利用溶胶－凝胶（ｓｏｌ－ｇｅｌ）方法制备了ＳｉＯ２－ＧｅＯ２薄膜,并测量了薄样品电场极化后光学二次谐波信号的相对大小和时间弛以豫特性,通过对汪同衬底材料及不同温度下电场极化薄膜样品二次谐波信号的时间弛豫特性比较,表明薄膜与衬底之间界面电荷的稳定性受衬底材料体电导率的影响,从而影响了薄薄膜样品二次谐波信号的稳定性。     

钡准分子光谱及其对钡原子跃迁线之贡献

用染料激光对热管炉中Ba蒸气进行研究时,在4200～4340A波长范围内,发现一宽带结构及一系列Ba原子的非基态能级产生的跃迁线,用Ba_2准分子的解离对可能产生跃迁的动力学过程做了分析,此宽带结构被归结为Ba_2准分子峰.     

Al原子高激发态nf~2F光谱与Stark效应观察

利用两步激光激励,得到Al原子高激发态nf系列的谱线,观察到由于Stark效应引起的禁戒跃迁线的产生,谱线位移与谱线放宽,并给出初步的理论分析。     

Al原子高激发态nf2F光谱与Stark效应观察

利用两步激光激励,得到Al原子高激发态nf系列的谱线,观察到由于Stark效应引起的禁戒跃迁线的产生,谱线位移与谱线放宽,并给出初步的理论分析。 关键词：     

Femtosecond laser induced defects in various silica glasses

The mechanism of near infrared (IR) focused femtosecond (fs) laser induced defects in silica glasses produced by different methods is systematically investigated through measurements of absorption, fluorescence, and electronic spin resonance (ESR) spectra. The influence of impurities and hydroxyl groups on defects is discussed. The results show that ES silica glasses containing high OH and few defects are much stable under fs laser irradiation. It is also verified that Si E_δ~′center formation has no direct relation with chloride ions.     

Femtosecond laser induced defects in various silica glasses

The mechanism of near infrared (IR) focused femtosecond (fs) laser induced defects in silica glasses produced by different methods is systematically investigated through measurements of absorption,fluorescence, and electronic spin resonance (ESR) spectra. The influence of impurities and hydroxyl groups on defects is discussed. The results show that ES silica glasses containing high OH and few defects are much stable under fs laser irradiation. It is also verified that Si E'δ center formation has no direct relation with chloride ions.     

溶胶-凝胶光学微盘制作及微腔回廊耳语模式研究

采用光聚合溶胶-凝胶材料，通过光刻制备得到直径在15μm-20μm间的光学微盘谐振腔，在掺有若丹明B染料时，用脉冲532nm激光抽运微盘，观察到回廊耳语模式，实验所得峰位与理论值相符。实验所得到微盘谐振腔最大Q值为900。实验表明，基于溶胶-凝胶材料的光刻方法是一种用于制备低阈值微盘激光器的可行方法。     

Er/Yb共掺体系的光致荧光行为及相关物理过程研究

采用固相反应方法，制备了Er₂O₃浓度固定为0.5mol%，Yb₂O₃浓度范围为0.0mol%—5.5mol%的Er/Yb共掺激光玻璃.通过吸收光谱、光致荧光光谱和上转换荧光光谱，研究了Yb₂O₃浓度对Er³⁺荧光特性的影响，并探讨了相关的物理机制.研究结果表明：Yb³⁺共掺对Er³⁺的⁴ 关键词： Er/Yb共掺 光致荧光 能量传递 合作上转换     

复合方形环近零折射率超材料的高增益特性研究

设计了一种由4个方形环和4个金属片组成的复合方形环单元结构,并将其周期排列,形成了近零折射率超材料.该超材料的近零频段为6.17 GHz到6.26 GHz.将其置放在微带贴片天线正上方处,采用有限元法(FEM)和时域有限差分法(FDTD)对该超材料测试系统进行了仿真分析,两种方法的仿真结果吻合较好,证实了计算方法结果的有效性.结果表明,复合方形环近零折射率超材料有高增益高定向的特性,可以应用于天线中,提高增益.