铒掺杂钠铝硅玻璃成分对其光谱性质的影响

研究了Na2O含量对Na2O-Al2O3-SiO2(NAS)玻璃的光谱性质的影响。利用Judd-Ofelt(J-O)理论和吸收光谱计算了Er^3+掺杂的铝硅酸盐玻璃的Ωt参数、自发辐射几率和自发辐射寿命，分析了Ωt参数与Na2O含量的关系以及与吸收截面，Er^3+离子^4I13 2能级的自发辐射几率和荧光半峰全宽(FWHM)等性质的关系。随Na2O含量的增加．J-O参数Ωt(t=2，4，6)减小，Er^3+离子1533nm的吸收截面和荧光半峰全宽．Er^3+离子^4I13 2能级的自发辐射几率也减小，而E

用于波导放大器的Er^3＋／Yb^3＋共掺磷酸盐玻璃的性能研究

通过优化熔融条件和玻璃组份，成功开发出一种新的Er^3+／Yb^3+共掺磷酸盐玻璃，其在沸水和熔盐中均表现出很好的化学稳定性。通过分析室温下Er^3+／Yb^3+共掺磷酸盐玻璃的吸收光谱，计算得到了Er^3+离子在波长1533nm处的峰值发射截面和杜得-奥菲而特强度参数；其中Er^3+离子在波长1533nm处的峰值发射截面为0．72×10^20cm^2，大于Schott的IOG1玻璃中Er^3+离子的峰值发射截面0．67×10^-20cm^2。通过改变离子交换的条件，获得了1．55μm单模光波导的制作条件

GeO2 : Bi, M (M = Ga, B) glasses with super-wide infrared luminescence

Broadband infrared luminescence covering the optical telecommunication wavelength region of 0, E and S bands was observed in GeO2: Bi, M (M = Ga, B) glasses prepared by conventional melting-quenching technique. The luminescence with a maximum at around 1320 nm possesses a full width at half maximum larger than 300 nm and mean fluorescent lifetime longer than 500 mus when excited by an 808 nm-laser. These glasses may have potential applications in widely tunable laser and super-broadband optical amplifier for the optical communications. (C) 2005 Elsevier B.V. All rights reserved.

Spectroscopic properties of Nd3+-doped high silica glass prepared by sintering porous glass

A new kind of Nd3+, -doped high silica glass (SiO2 > 96% (mass fraction)) was obtained by sintering porous glass impregnated with Nd3+, ions. The absorption and luminescence properties of high silica glass doped with different Nd3+, concentrations were studied. The intensity parameters Omega(t) (t = 2, 4, 6), spontaneous emission probability, fluorescence lifetime, radiative quantum efficiency, fluorescence branching ratio, and stimulated emission cross section were calculated using the Judd-Ofelt theory. The optimal Nd3+ concentration in high silica glass was 0.27% (mole fraction) because of its high quantum efficiency and emission intensity. By comparing the spectroscopic parameters with other Nd3+ doped oxide glasses and commercial silicate glasses, the Nd3+-doped high silica glasses are likely to be a promising material used for high power and high repetition rate lasers.

Spectroscopic properties of Nd3+:(La,Sr)(Al,Ta)O-3 crystal

A new laser crystal Nd3+:(La, Sr)(Al, Ta)O-3 (abbreviated as Nd3+:LSAT) has been grown by the conventional Czochralski method. The absorption and luminescence spectra of trivalent neodymium in Nd3+:LSAT crystal were measured at room temperature. The value of absorption and emission cross-section was calculated. The Judd-Ofelt analysis was applied to the crystal to get the phenomenological parameters (Omega(i), i = 2,4,6), the line strengths, the radiative transition rates, the branching ratios and the radiative lifetime. (C) 2006 Elsevier B.V. All rights reserved.

Effects of CO2 laser conditioning of the antireflection Y2O3/SiO2 coatings at 351 nm

Y2O3/SiO2 coatings were deposited on fused silica by electron beam evaporation. A continuous wave CO2 laser was used to condition parts of the prepared samples at different scanning speeds in the air. LAMBDA 900 spectrometer was used to investigate the changes of the transmittance and residual reflection spectrum. A Nomarski microscope under dark field was used to examine the changes of the micro defect density. The changes of the surface roughness and the microstructure of the film before and after conditioning were investigated by AFM and X-ray diffraction, respectively. We found that laser-induced damage threshold (LIDT) of the films conditioning at 30 mm/s scanning speed was increased by more than a factor of 3 over the thresholds of the as-deposited films. The conditioning effect was correlated with an irradiation-induced decrease of the defect density and absorption of the films. (c) 2005 Elsevier B.V. All rights reserved.

1053，527，351nm倍频分离膜的制备与性能研究

用电子束蒸发及光电极值监控技术在石英基底上沉积了三倍频分离膜，将部分样品置空气中于250℃温度下进行3h热退火处理。然后用Lambda900分光光度计测量了样品的光谱性能；用表面热透镜技术测量了样品的弱吸收值；用调Q脉冲激光装置测试了样品分别在355nm和1064nm的抗激光损伤阈值。实验结果发现，样品的实验光谱性能良好。退火前后其光谱性能几乎没有发生温漂，说明薄膜的温度稳定性好；同时弱吸收平均值从退火前的1.07×10^-4下降到退火后的6．2×10^-5，从而使对基频的抗激光损伤阈值提高，从14．6J

平面行星夹具均匀性修正挡板设计方法研究

众多光学系统对其关键环节大尺寸多层光学薄膜提出了越来越复杂的光谱要求，相应地对各个单层膜的厚度容差要求越来越严格。在整个基底表面，每一层都需要沉积得相当均匀。因为，任何单层的非均匀性将增加最终的膜厚误差。随着平面行星夹具广泛地应用于大尺寸光学薄膜制备，必须实现对行星夹具的均匀性有效控制。本文建立了平面行星夹具薄膜沉积无量纲模型，通过对夹具上各点的运动轨迹分析，提出了停留概率修正法，获得的理论均匀性与实验结果吻合。用此法设计出单片修正挡板将夹具Ф560mm范围内的不均匀性从4％改进到6‰。

天然水果保鲜剂的研究与应用

从柑桔未成熟果皮精油中含有抑杀柑桔类在贮藏过程危害最大的“青绿霉病”病原菌，研究成功天然水果（防霉）保鲜剂，保鲜剂用量少（载体的0.3-0.6％），保鲜效果好（90天贮藏损耗在4-6％－含干耗），使用安全（经系统毒理评价AID值为12.37mg，按贮藏90天柑肉残留量测定结果每人每天吃100个柑桔也远未超过此量）。为国内首创（已获申请国家专利），目前国外也未见有类似的研究成果。由于保鲜剂为一高效防霉杀菌成分，用量极少，故产值一直未能提高，也导致从经济效益来衡量难于找到直接生产单位。另一方面，保鲜剂生产是利用樟树叶不存在破坏资源，生产过程是直接从植物中提取，不通过化学合成，故不存在污染环境，安全性高。