车削铝镜红外高反射膜镀制

在红外光谱系统中使用的车削铝镜上镀制高反射膜时,由于铝镜镜面较柔软,用常规擦拭 清洗的方法易划伤镜面,可以在镀制前利用有机物熏蒸的方法清洗车削铝镜,既溶解清洗了表面附着的油污和灰尘,又保护了铝镜镜面。用该方法清洗后镀制的金膜反射率在近红外波段达到98%以上,膜层牢固,使用效果较好。     

真空紫外～X射线反射膜研究现状

真空紫外～X射线反射膜在分子、原子结构、宇宙物理、微纳米器件、生命科学等研究领域有着极其重要的应用。本文总结了迄今为止在A〈200nm内反射膜研究的进展情况，列出了常用单层金属反射膜最佳沉积条件、反射光谱以及各自的特点；对复合膜则根据所应用的波长范围，阐述了膜材选择、膜层设计及薄膜制作过程中所涉及的一些重要问题，分析了复合膜反射率增强的机理。并给出了相应波段所用的膜材、膜对结构及所能达到的最高反射率。     

磁控溅射法制备高反射铝膜

通过先后调整溅射沉积时间、溅射功率以及溅射气压等镀膜参数,然后结合所镀样品的反射率测量,分析了镀膜参数对铝膜反射率的影响;通过调整不同的离子束清洗时间,结合所镀样品的太阳光谱反射率测量以及附着力测试,研究了离子束清洗对铝膜性能的影响。结果表明,在这些影响因素中离子束清洗对铝膜性能的影响很大。     

光学显示双膜系PC镜片的设计与制备

光学显示仪器前的镜片需要通过镀膜来对特定波段形成高反射。以聚碳酸酯(PC)镜片作为基底,采用真空镀膜技术,在PC镜片上镀高反射膜和增透膜,研究了增透膜对消除PC镜片表面二次反射的影响。研究结果表明,PC只有前表面镀反射膜的反射曲线在530 nm处波长的反射率达到85.05%,同时在PC镜片前面镀反射膜和PC镜片后面镀增透膜的反射曲线在530 nm处波长的反射率达到78.33%。PC镜片的反射率降低了6.72%。     

用逐层法设计Rh-Si真空紫外高反膜

本文简要阐述了"逐层"设计方法,并将其用于真空紫外波段高反膜的设计。利用Matlab软件编程设计,计算了50 nm~200 nm波段范围内高反膜系及其反射率。并与同样以熔融石英为基底、不同膜材组合所达到的膜系反射率进行了对比,反射率增大明显。同时计算了实验中出现膜厚误差时对反射率造成的影响。     

传输紫外激光用空芯光纤结构设计

对传输紫外激光用空芯光纤结构进行了研究.铝膜是从紫外到红外都有很高反射率的理想材料,用它来研制的空芯光纤的直线损耗和弯曲损耗均较小.在铝膜上涂覆设计厚度的低折射率膜可进一步提高系统的反射率,增加传输效率,并保护铝膜免受大气侵蚀.     

钼酸铅晶体表面红外增透膜的研究

本讨论了用于钼酸铅晶体表面的宽带红外增透膜的设计以及其在真空环境中的制备，膜系设计中，运用反射率图解法以获得满意的光学性能，与传统的热蒸发镀膜工艺相比，在真空沉积过程中采用了离子辅助沉积技术，从而大大提高了膜层的光学特性及膜层品系，试验表明所镀膜层性能优异，在光纤通信领域具有广阔的应用前景。     

几种高反膜设计新方法

现代科技的发展对增反膜提出的要求越来越高,具体表现在两个方面:一是要求在现有基础上进一步提高反射率,拓宽高反膜带宽,二是将高反膜的波长向短波方向延伸至真空紫外~X射线。本文总结了近年来出现的一些思路独特的增反膜设计新方法,包括Needle设计法、Staggered broad-band reflecting multilayers法、Sub-quarterwave multilayers法、Layered synthetic mi-crostructure/quasi-periodic multilayers法、Layer by layer法、带阻挡层的Layer by layer法及Wide range multilayer设计法。给出了这些设计方法的思路,以真空紫外~X射线反射膜为侧重点。对增反膜设计、制作过程中尚存的一些重大问题也进行了阐述。     

退火温度对宽带脉冲压缩光栅载体金属/介质多层高反膜的影响

分别以金(Au)作为金属层材料, 氧化铪(HfO₂)与氧化硅(SiO₂)作为高低折射率层材料, 利用物理气相沉积方法制备了用于宽带脉冲压缩光栅制作的金属/介质多层高反膜, 研究了退火温度对其表面均方根粗糙度、反射率及抗化学清洗破坏能力的影响。实验结果表明: 退火前后样品表面均方根粗糙度变化很小; 提高退火温度能提高金属/介质多层膜的抗化学清洗破坏能力, 但反射率会随之下降。250℃退火10 h后金属/介质多层膜不仅可以承受住化学清洗过程, 而且反射率下降也比较小, 可以作为金属/介质多层膜的最佳退火工艺。     

光学显示PC镜片多层反射膜的设计与制备

光学显示仪器前的镜片需要通过镀膜来对特定波段形成高反射,国内绝大多数的光学显示镜片还是玻璃,本文以聚碳酸酯(PC)镜片作为基底,采用真空镀膜技术,在聚碳酸酯(PC)镜片上镀高反射膜,研究了不同膜系结构(层数不同)的反射膜对特定波段的反射效果。研究结果表明,采用了5层膜的设计,PC在可见光区的400nm波段到700nm波段的最高反射率从9.5%上升到85%。PC在特定波段的反射率得到了明显的提高。     

真空紫外线对聚合物材料表面的影响

针对航天需要。研究了聚四氟乙烯(PTFE)和聚脂(PET)在真空紫外线(VUV)作用下的表面层变化。发现在所采用的射流式真空紫外线源的辐照作用下。聚四氟乙烯和聚脂颜色变成黑褐色。而且对表面的X光电子能谱(XPS)分析发现辐照后材料表面发生碳的富集。热失重分析发现辐照后样品失重增大。     

Luminescent properties of a novel green-emitting gallium borate phosphor under vacuum ultraviolet excitation

Vacuum ultraviolet (VUV) excitation and emission properties of a new Tb³⁺-activated green-emitting phosphor with huntite-type gallium borate, LnGa₃(BO₃)₄:Tb³⁺ (Ln = Y, Gd), are investigated. Overall absorption bands are in the range of 120-250 nm and can be tentatively interpreted in terms of the charge transfer transition from host to rare earth ions and the Tb³⁺ activator. Additionally, an appropriate atomic ratio of Y³⁺/Gd³⁺ in the host compound enhances both the excitation and emission efficiency under VUV excitation. Enhanced absorption efficiency for the VUV light makes these novel phosphors the prominent luminescent materials with plasma-discharge conditions, by converting the VUV radiation to the visible light.     

The electronic structure and luminescence properties of Ce3+ doped Sr10[(PO4)5.5(BO4)0.5]BO2 under UV/VUV and X-ray excitation

The apatite related compound Sr₁₀[(PO₄)_5.5(BO₄)_0.5]BO₂ (SrBPO) doped with Ce³⁺ was synthesized via solid state reaction method. Undoped SrBPO shows blue-green emission under ultraviolet (UV) and X-ray excitation due to the defects in the host. When excited by vacuum ultraviolet–ultraviolet (VUV–UV) light or X-ray, Ce³⁺ doped SrBPO shows a broad emission band peaking at 450 nm originating from 5d–4f transition of Ce³⁺ and defects in the host. The phosphor exhibits strong excitation bands in UV range and a weak broad excitation band in VUV region. The site occupation of Ce³⁺ was proposed based on fluorescence decay curves. Electronic structure shows the compound is an indirect semiconductor with a band gap of 3.04 eV. The extremely small density of states of [PO₄]³⁻ or [BO₄]⁵⁻ group near Fermi level or in the conduction band is a possible origin of the weak excitation band in the VUV range. A possible mechanism was proposed to explain the luminescence properties observed.     

真空-紫外线对空间材料降解的研究进展

综述了真空-紫外线的空间环境效应及真空-紫外线对空间材料的降解作用.真空-紫外线辐射使材料表面粗糙度增大,表面成分、结构发生变化,机械性能和光学性能下降,同时真空-紫外还可以与原子氧产生协同效应,加速材料的降解.     

钒硼酸钇铕荧光粉的真空紫外光谱特性研究

采用高温固相法合成了YBχV1-χO4-χ：Eu^3＋荧光粉,利用XRD变温发射光谱以及真空紫外激发的光谱对其进行研究。结果表明,在147nm的真空紫外光激发下,荧光粉的发射主峰位于619nm,与（Y,Gd）BO3：Eu^3＋相比,色纯度较好,发光亮度达86％,是彩色PDP用红色荧光粉的候选材料。     

一种新型的紫外光源--准分子紫外灯

非相干性紫外或真空紫外光源的应用已成为众多工业部门中一项基础性和关键性的技术.本文着重介绍一种使用介质阻挡放电激发紫外或真空紫外辐射的新型光源--准分子紫外灯,包括准分子的形成以及光源的紫外辐射效率.最后,对影响准分子辐射的因素如气压、气体组成、温度及电源频率和电压进行了初步的分析.     

Luminescence and scintillation properties of rare-earth-doped LuF3 scintillation crystals

The Nd-doped and Er-doped LuF₃ single crystals were grown by the micro-pulling-down method to study their scintillation properties in the vacuum-ultraviolet (VUV) region. The doubly Nd–Er codoped single crystal was grown to study possibility of scintillation performance improvement by energy transfer from Er³⁺ to Nd³⁺ ions. The LiF flux was to avoid phase transition below melting temperature. The 1%Nd-doped sample showed the highest overall scintillation efficiency under X-ray excitation which was 7 times as high as that of the LaF₃:Nd 8% standard. The leading Nd³⁺ 5d–4f emission was situated at 176 nm, while the Er³⁺ 5d–4f emission for Er-doped samples was observed at 163 nm, which better matches the sensitivity of some VUV-sensitive photodetectors. The optimum Er concentration was determined to be around 1–3 mol%. No Er³⁺ 5d–4f emission was observed for the doubly Er,Nd-codoped sample due to energy transfer from the Er³⁺ to Nd³⁺ ions. Slight improvement of the light yield was observed in the doubly-doped sample with respect to the Nd-only doped one.     

VUV–UV luminescence of Ce3+, Tb3+, Eu3+, and Dy3+ doped GdOCl

The vacuum ultraviolet spectroscopic properties of GdOCl:Re³⁺ (Re³⁺ = Ce³⁺, Tb³⁺, Eu³⁺, and Dy³⁺) are investigated in detail for the first time. The host absorption band is determined to be around 179 nm, and the f–d transition bands as well as the charge transfer bands are assigned. Upon 179 nm excitation, Re³⁺ (Re³⁺ = Ce³⁺, Tb³⁺, Eu³⁺, Dy³⁺) ions shown their characteristic emissions. Energy transfers from Gd³⁺ to Re³⁺ ion were observed. A broad band ranging from 350 to 400 nm corresponding to the d–f transition of Ce³⁺ is observed. Eu³⁺ has typical red emission with the strongest peak at 620 nm; Tb³⁺ shows characteristic transition of ⁵D_3,4 → ⁷F_j, and its spin-forbidden and spin-allowed f–d transitions in VUV region are calculated with Dorenbos’ equations, these calculated values agree well with the experimental results. Dy³⁺ presents yellow emission (⁴F_9/2 → ⁶H_13/2) with the strongest peak at 573 nm.     

BaxAl12O19:Mnz荧光粉X射线衍射分析

研究了Ba2 、Mn2 含量对钡铝酸盐绿色荧光粉基质晶体结构的影响.XRD研究结果表明,随着Ba2 浓度的增加,存在BaAl13.2O20.8→BaAl12O19→BaAl9.2O14.8的基质结构转化,晶胞尺寸增大.BaMnAl10O17结构是贫钡铝酸盐中Mn2 的主要存在形式,其数量与Mn2 掺杂量有关.     

Synthesis, structure and luminescent properties of Lu(PO3)3

A new structural type of rare earth metaphosphate, Lu(PO₃)₃, was prepared from high-temperature solution, of which the crystal structure was solved in S.G. of Cc (No.9) and Z = 4 with unit cell dimensions of a = 13.972(3) Å, b = 6.6710(13) Å, c = 9.958(2) Å and β = 127.36(3)°. In Lu(PO₃)₃, [LuO₆] octahedra connect with the non-bridging oxygens on (PO₃)_n infinite zigzag chains that extended along c-axis. The VUV and X-ray excited luminescent properties of undoped and Ln³⁺ (Ln = Ce, Eu, Tb) doped samples were examined, from which the optical band gap was estimated to be 8.3 eV. Besides, in the undoped sample a STE emission within 320–480 nm was observed, which probably be related to oxygen defects. However, in the Lu(PO₃)₃:Ce sample the Ce³⁺ emission was weak and STE emission was totally quenched under hard X-ray excitation.