959 resultados para Er-doped silica glass


Relevância:

100.00% 100.00%

Publicador:

Resumo:

We report the fabrication of a novel surface-enhanced Raman scattering (SERS) substrate with a controllable enhancement factor (EF) using femtosecond laser direct writing on Ag+-doped phosphate glass followed by chemical plating at similar to 40 degrees C. Silver seeds were first photoreduced using a femtosecond laser in a laser-irradiated area and then transformed into silver nanoparticles of suitable size for SERS application in the subsequent chemical plating. Rhodamine 6G was used as a probing molecule to investigate the enhancement effect of a Raman signal on the substrate. Nearly homogenous enhancement of the Raman signal over the Substrate was achieved, and the EF of the substrate was controlled to some extent by adjusting fabrication parameters. Moreover, the ability of forming a SERS platform in an embedded microfluidic chamber would be of great use for establishing a compact lab-on-a-chip device based on Raman analysis.

Relevância:

100.00% 100.00%

Publicador:

Resumo:

单纵模掺铒光纤激光器在光通信和光传感等方面有着广泛的应用前景。设计了一种新型的光纤激光器,在光纤环形镜中嵌入未抽运的掺铒光纤作为可饱和吸收体以抑制多纵模,用光纤环谐振腔作为滤波器抑制拍频噪声,用光纤光栅作为波长选择器件,最终得到了单纵模输出并消除了拍频噪声。使用零拍法测量其线宽小于频谱仪的低频极限5kHz。实验结果证明了可饱和吸收体和光纤环的功能。

Relevância:

100.00% 100.00%

Publicador:

Resumo:

采用镀K9玻璃薄膜方法来解决离子交换掺铒磷酸盐玻璃波导表面的侵蚀问题,对K9玻璃薄膜的厚度进行了优化研究。测量分析了样品的荧光光谱和荧光寿命,采用光学显微镜和棱镜耦合技术对不同K9玻璃薄膜厚度下制备波导的表面形貌和导光特性进行了表征和测试。结果表明,与掺铒磷酸盐玻璃原材料相比,镀K9玻璃薄膜后荧光光谱保持不变,荧光寿命稍有下降(约0.2 ms);K9玻璃薄膜的厚度在60~80 nm的范围内保护效果最佳。为下一步制备掺铒有源玻璃光波导器件奠定了良好的实验基础。

Relevância:

100.00% 100.00%

Publicador:

Resumo:

采用溶胶-凝胶方法制备的(CH2)2Si(OC2H5)2预聚体涂膜液中,掺入碱催化的SiO2悬胶体涂膜液,采用旋涂法在掺钕磷酸盐激光玻璃棒端面涂制了改性的防潮膜。当涂膜液中(CH2)2Si(OC2H5)2和SiO2物质的量之比为1:1时。热处理后的膜层耐摩擦性能明显改善;表面粗糙度的均方根值为1.245nm;膜层激光破坏阈值大于15J/cm^2(1053nm,1ns);在80℃和95%RH的封闭环境中静置336h,膜层的透过率、接触角基本不变。结果证明膜层具有稳定的疏水结构和很好的防潮性能,膜层强度增加,

Relevância:

100.00% 100.00%

Publicador:

Resumo:

散粒磨料研磨与固着磨料研磨是光学研磨加工过程中的两种主要手段,但两者材料去除的机制不同。目前针对高功率固体激光装置中的主要工作物质——磷酸盐激光钕玻璃的亚表面缺陷(SSD)研究相对较少,因此在实验的基础上,通过系统地研究固着磨料对磷酸盐激光钕玻璃的研磨工艺过程,分析了多种因素,如磨料粒径、载荷大小、机床转速,以及结合剂材料与冷却液等对钕玻璃亚表面缺陷形成的影响,并与散粒磨料研磨工艺所产生的亚表面缺陷进行了比较,对关键工艺参数进行定量,为高质量钕玻璃制造工艺的选型以及进一步优化亚表面缺陷提供了重要的参考数据。

Relevância:

100.00% 100.00%

Publicador:

Resumo:

系统地研究了光学研磨过程中,磨料粒径、载荷大小以及机床转速对钕玻璃表面及亚表面损伤的影响。结果表明,机床转速和载荷基本不改变材料表面粗糙度,而较大载荷或较低机床转速产生较大的亚表面缺陷,表面粗糙度和亚表面缺陷缺陷深度基本与最大磨料粒径呈正比,载荷增倍使亚表面缺陷与表面粗糙度的常数比值增加0.05。研究结果为钕玻璃加工工艺改进提供了参考依据。

Relevância:

100.00% 100.00%

Publicador:

Resumo:

Cr~(2+):ZnSe具有很宽的吸收带和发射带,是中红外波段优秀的可调谐激光材料。从吸收光谱、发射光谱以及角度调谐输出对Cr~(2+):ZnSe晶体的激光输出性能进行了研究。采用真空高温扩散法制备Cr~(2+):ZnSe晶体.获得了高浓度的Cr~(2+)离子掺杂的厚1.7 mm,直径10 mm的薄片ZnSe晶体。使用中心波长2.05μm,最大输出功率8 W的Tm离子掺杂的光纤激光器抽运,使用平凹腔结构搭建谐振腔,获得了最大平均功率1.034 W,中心波长2.367μm,线宽10 nm的连续激光输出。利用角度调谐的方法,对Cr:ZnSe晶体的调谐性能进行了研究,在100 nm范围内获得了调谐输出。

Relevância:

100.00% 100.00%

Publicador:

Resumo:

利用光纤-波导耦合器技术侧面泵浦一根4厘米长的短光纤,我们研制得到了一个红外波长的光纤激光器。该激光器的增益介质是横截面为矩形的掺钕磷酸盐玻璃光纤,其纤芯横截面尺寸为1.5×0.5 毫米,数值孔径为0.2。单横模激光可以通过该矩形光纤的增益-导引效应来获得。最大的激光输出功率为1.05瓦,斜率效率为10%。

Relevância:

100.00% 100.00%

Publicador:

Resumo:

研究了摩尔组分为70TeO2-(20-x)ZnO-xPbO-5La2O3-2.5K2O-2.5Na2O(x=0,5,10,15,20)的新型多元铅锌镧碲酸盐激光玻璃,外掺Yb2O3为玻璃摩尔组分的1%,测试了试样的物理性质及吸收光谱、荧光光谱和荧光寿命,计算了Yb^3+的吸收截面、受激发射截面、荧光有效线宽等光谱参数,结果表明:该系列玻璃都具有良好的热学稳定性((Tx-Tg)>195℃,高于TZN玻璃(118℃));当X=15时,样品具有较好的光谱性质:高的受激发射截面(1.25pm^2)、长的荧光寿命(

Relevância:

100.00% 100.00%

Publicador:

Resumo:

本文综述了近年来用于上转换发光的掺稀土离子氧氟微晶玻璃的研究概况,系统阐述了氧氟微晶玻璃中的上转换发光特性及其机理,提出了值得进一步研究的工作并对掺稀土离子氧氟微晶玻璃未来的前景做出了展望。

Relevância:

100.00% 100.00%

Publicador:

Resumo:

在掺铒碲酸盐玻璃中加入Nb2O5以提高其热力学稳定性,测试了4种掺铒碲酸盐玻璃的热力学稳定性参数及其吸收光谱、荧光光谱.应用Judd-Ofelt理论计算了玻璃的强度参数Ω(Ω2=(5.99~10.38)×10^-20cm^2,Ω4=(1.91~2.67)×10^-20cm^2,Ω=(0.92~1.28)×10~cm^2),应用McCumher理论计算了受激发射截面.比较了不同组成对碲酸盐热力学稳定性和光谱性质的影响.实验结果表明,0.70TeO2-0.15Zn0—0.05BaO—0.10Nh2O5玻璃具有

Relevância:

100.00% 100.00%

Publicador:

Resumo:

制备了不同含水量的掺铒磷酸盐玻璃,研究了各种工艺参数对反应气氛法除水效果的影响。结果表明由鼓泡气体带入的除水剂是玻璃除水的主要动力;在通气最初阶段的除水速率最快,并且提高除水温度、增大通气流量均有助于提高除水效率;结合实验从反应热力学角度讨论了除水机理,并指出在玻璃熔体中除水反应受熔体“笼效应”影响,反应速率大小取决于OH与CCl4形成偶遇对概率的大小。

Relevância:

100.00% 100.00%

Publicador:

Resumo:

为了研制出满足大功率脉冲氙灯技术要求的管壁材料,使用石英玻璃管二步法制备工艺,采用分层制砣技术,把纯石英玻璃和掺铈石英玻璃密切熔合,研制出新型的复合石英玻璃管。研制了几种不同复合比例的复合石英玻璃管,并对其光谱性能和机械性能进行了测试。通过对比实验表明,当纯石英玻璃层和掺铈石英玻璃层的比例合适时,复合石英玻璃管不仅具有吸收小于320nm波长的紫外辐射的性能,而且具有比掺铈石英玻璃管更高的机械强度和抗冲击性能,满足了大功率脉冲氙灯对管壁材料的特定要求。采用复合石英玻璃管制备的大功率脉冲氙灯具有优良的抗冲击性

Relevância:

100.00% 100.00%

Publicador:

Resumo:

Phosphate glasses 60P2O5-15CS2O- 15Al2O3-10BaO were made by high temperature melt-annealing method. The absorption spectra, excitation spectra and emission spectra of Gd3+-Tb3+ and Ce3+-Gd3+-Tb3+ co-doped phosphate glass 60P2O5-15CS2O- 15Al2O3-10BaO were studied. The experimental results indicate that, the doping of Ce3+ and Gd3+ in Tb3+ phosphate glass has a good effect on the 545 nm emission of Tb3+ at UV excitation. The Ce3+-Gd3+-Tb3+ co-doped phosphate glass have a good x-ray luminescence at the radiation of x-ray with energy in 50-120 kev, and a high space resolution. The Ce3+-Gd3+-Tb3+ co-doped phosphate luminescence glass is a promising material for using in the digital radiography system in medical devices.

Relevância:

100.00% 100.00%

Publicador:

Resumo:

The thermal stability, 2 μm fluorescence properties and energy transfer mechanism in Ho3+ doped fluorophosphate glass sensitized by Yb3+ and Tm3+ were investigated. The characteristic temperatures, absorption spectrum and fluorescence spectrum of the glass sample were measured. ΔT calculated from the characteristic temperatures shows that the thermal stability of fluorophosphate glass is better than fluoride glass. According to the absorption spectrum, several spectroscopic parameters of the glass sample, such as Judd-Ofelt parameters and spontaneous transition probability were calculated and compared with other glass hosts. The largest spontaneous transition probability for Ho3+:5 I7&rarr5I8 transition in fluorophosphate glass which is 78.48 s-1 indicates that fluorophosphate glass is an appropriate base glass to achieve 2 m fluorescence. From the fluorescence spectrum of the glass sample, the extremely strong 2.0 μm fluorescence intensity is observed, which is higher than the intensity of 1.8 μm fluorescence, showing that Ho3+ ions sensitized by Yb3+ and Tm3+ is efficient. Meanwhile, the absorption sections and emission sections of Yb3+, Tm3+ and Ho3+ were calculated and the pumping scheme and energy transfer mechanism among Yb3+, Tm3+ and Ho3+ are discussed. The study indicates that Yb-Tm-Ho tri-doped fluorophosphate glass is a significant sensitization glass system under 980 nm excitation for 2 μm applications.