共查询到19条相似文献,搜索用时 171 毫秒
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采用粉料漂浮高温熔融法自制Nd3+掺杂硫系玻璃微球,研究了腔量子电动力学增强效应对稀土掺杂硫系玻璃微球荧光光谱的影响。把直径90.53μm的硫系玻璃微球与锥腰直径1.02μm的石英光纤锥耦合,将808nm抽运激光导入微球,荧光光谱存在分立的共振峰。根据米氏散射理论公式,计算得到TE偏振态下基模的三个共振峰位置,确定了这三个共振峰的模式序数。增强因子η≈1122,这表明微球荧光自发辐射速率增强幅度为1122倍。在基模条件下对原增强因子公式进行近似化简,并利用近似公式进行估算得到η≈1167,误差为4%。 相似文献
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采用玻璃粉料高温漂浮熔融法制备了0.9%Er2S3(质量分数):75%GeS2-15%Ga2S3-10%CsI(摩尔分数)硫系玻璃微球,并用熔融拉锥法制备了锥腰直径为2.31 μm的石英光纤锥。将其与直径119 μm的硫系微球进行耦合,在980 nm 激光泵浦下获得了微球中与Er3+:4I13/2→4I15/2跃迁对应的1.54 μm处的荧光光谱。分析了微球和块状玻璃荧光光谱差异的原因,并用Mie散射理论公式对微球荧光光谱共振峰间隔进行了计算。共振峰间隔实验结果与理论计算误差最小仅为0.05%,验证了理论分析的正确性。最后,讨论了微球峰值间隔与泵浦功率的关系,排除了泵浦功率对共振峰间隔的影响。 相似文献
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通过CO2激光器熔融不同直径的熔锥光纤以得到相应直径的石英玻璃微球,利用此微球和熔锥光纤,构造了球微腔耦合系统。实验中利用光腰直径为3.1μm的熔锥光纤与直径为143.1μm的石英玻璃微球进行耦合,通过最大分辨力为1pm的可调谐半导体激光器对该耦合系统进行光谱扫描,发现石英玻璃微球的吸收光谱中出现分立的结构共振峰。利用光学微球腔理论讨论了石英玻璃微球吸收光谱中的结构共振,并用米氏散射理论公式对一阶TE模共振峰的位置以及它们的间隔进行了计算,共振峰位置实验结果与理论结果的误差仅为0.03%,表明实验与计算结果相符。 相似文献
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用熔融淬冷法制备了0.5wt.%掺杂Nd3+:75GeS2-15Ga2S3-0CsI(0.5wt.%Nd-GGSI)硫卤玻璃.在此基础上以玻璃粉料漂浮熔融法制备出粒径为50~300μm高折射率(n≈2.1)玻璃微球,并在显微镜下选出表面质量高的硫卤微球用于后续实验.将火焰法拉制出的直径1~2μm间的双锥形石英微纳光纤与硫系微球进行近场耦合.相位匹配条件下测试结果表明光纤锥倏逝场将激发球内径向高阶回音壁模式.实验测量了在808nm LD激光泵浦下直径110μm微球的荧光光谱特性,结果表明:掺Nd3+硫卤微球在输出端1 075nm波段附近产生了等间距分布的荧光回音壁模式的光学谐振,共振峰间隔为1.80nm.实验结果与微球腔回音壁模式谐振的理论模型有较高的符合度. 相似文献
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原子或离子置于微腔中时其自发辐射速率会由于腔量子电动力学效应而得到大幅提高,这就是Purcell增强效应.如将Eu离子掺入特定的微腔中,因为Eu^3+的自发辐射荧光线宽比微腔WGM模式的线宽大,其荧光光谱将受到腔模的调制,从而反映出腔模的分布状况。实验上,我们制备了熔融玻璃微球腔,并且在微球的赤道附近沾上一定量的Eu^3+离子。测量了用395nm半导体激光泵浦时的荧光谱。 相似文献
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Single-mode Nd3+-doped phosphate glass fiber with a core diameter of 8 μm was prepared. Laser properties pumped by an 800 nm laser diode were measured using a Fabry-Petor cavity. Laser emission centered at the wavelength of 1.053 μm,and a 1.053 μm CW laser with output power of 8.36 mW and slope efficiency of 30.6% were observed. 相似文献
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ZHANG Junjie QI Changhong JI Huixing LING Fengying HU Hefang 《Chinese Journal of Lasers》1999,8(5):393-396
1IntroductionFiberlasersandamPlifiershavebeendevgloPedraPidlyinrecentyears-Fiberlasersofferlowcost,easilyPr0ducedsourcesatimpotantwaVelengthf0rtelecommunication,sensing,spectrOSCopyandmedicalaPplicatiQns['1.Thlaseremissdricenteredatthewavelmethof1.053pmisprOAnsinglyaPPliedinthesystemofhighenergylaserforinertialc0nfinementfusiOnresearch.T0obtainlaserendSShaatthiswavelength,mass-wokshavebeendonandremarkableprogessandachievementhavebeenmade,mainlyinsilicafiberdoPedwithY-b [2'3].Itiswellkn… 相似文献
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Martín LL Haro-González P Martín IR Navarro-Urrios D Alonso D Pérez-Rodríguez C Jaque D Capuj NE 《Optics letters》2011,36(5):615-617
Whispering-gallery modes (WGMs) on Nd3+-doped glass microspheres with a radius of ~15?μm were measured in a modified confocal microscope, where a dual spatial resolution in both excitation and detection zones was possible. As an alternative to the standard excitation mechanism by an evanescent wave, we used an efficient pumping/detecting scheme, focusing a laser in the microsphere and exciting the Nd3+ ions, whose fluorescent emission produces the WGMs. We have also measured the generated WGMs by changing the detection zone, where higher amplitude resonances were found when exciting in the center and detecting at the edge of the microsphere. 相似文献
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采用高温熔融法制备了镝离子掺杂氟硼酸盐玻璃荧光体,利用积分球绝对光谱测试系统,在453 nm蓝色激光二极管激发下,对玻璃荧光体的荧光光谱进行表征,解析出玻璃荧光体的相关绝对荧光参量。测试与计算结果表明,1.0 Wt% Dy2O3掺杂玻璃荧光体在功率15.81 mW的蓝色激光激发下,净发射光谱功率是286.91 μW,发射光子数为17.17×1014 cps,其荧光量子产率达到25.86%。为提高玻璃荧光体对泵浦激光的利用率,减少残余激光成分,进而改善组合光品质,制备了大体积的1.5 Wt% Dy2O3掺杂玻璃荧光体,在高功率的蓝色激光激发下获得白色照明效果,该玻璃荧光体在激发功率分别为56.0和252.7 mW的激光激发下,组合荧光对应的色坐标分别是(0.316, 0.287)和(0.303,0.268)。激光激励下的高效白色发光表明Dy3+掺杂氟硼酸盐玻璃荧光体在激光照明领域具有良好的应用前景。 相似文献
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Blue Cooperative Luminescence In Yb3+-Doped Barium Gallogermanate Glass Excited At 976 nm 总被引:1,自引:0,他引:1
The Yb3+-doped barium gallogermanate glass has been prepared via the conventional melt method. The absorption spectra, the near infrared
emission spectra, the upconversion emission spectra and the differential scanning calorimetry have been measured. Bright blue
upconversion emission centered at 476 nm has been observed under the 976 nm laser diode excitation at room temperature. The
blue upconversion emission mechanism has been discussed on the blue emission intensity and the measured lifetime. The slope
of the log-log plot of the blue emission intensity versus the pump power is equal to 1.98, and the blue luminescence decay
time is half of the near infrared fluorescence decay time, confirming that the blue emission comes from Yb3+-Yb3+ pairs cooperative upconversion mechanism. The result of differential scanning calorimetry suggests that this type of glass
is suitable as a potential candidate for fiber drawing. 相似文献
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Nd3+-doped tellurite glass and a single mode tellurite glass fiber with a core diameter of 8 μm were prepared in this work. The 1.33-μm emission from the 4F3/2→4I13/2 transition of Nd3+ with a spectral bandwidth of 55 nm in tellurite glass fiber is observed.The lifetime of 164μs of 4F3/2 level and quantum
efficiency of about 100 % are obtained. 相似文献
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为研究光学微球腔的热光效应,采用1550nm波段可调谐激光器和宽带光源两种泵浦源,分别测量了二氧化硅、碲酸盐玻璃微球及其掺杂了稀土离子的微球在激励光功率、环境温度变化时其谐振峰波长的变化量,得到了二氧化硅微球激励功率灵敏度为32.4pm/mW,温度灵敏度为13.4pm/℃;铥离子的掺杂使激励功率灵敏度达到48.7pm/mW,温度灵敏度达到15.2pm/℃.相应的碲酸盐微球激励功率灵敏度为71.1pm/mW,温度灵敏度为0.0191nm/℃,比光纤光栅温度传感器的灵敏度10pm/℃大了将近1倍,若掺杂了稀土离子,则高1.1倍.本文研究对微腔在温度传感器方面的应用具有参考意义. 相似文献
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研究了Er3+离子掺杂钡镓锗玻璃的吸收光谱、拉曼光谱和上转换光谱.分析了Er3+离子在钡镓锗玻璃中的上转换发光机理.结果表明:玻璃的最大声子能量为828cm-1,紫外截止波长为275nm.采用800nm和980nmLD激发玻璃样品,在室温下观察到强烈的上转换绿光和红光发射.随着Er3+离子浓度的增加,绿光发光强度先增加后减小,而红光发光强度呈单调递增趋势.能量分析表明:800nmLD激发产生的绿光主要源于Er3+离子4I13/2能级的激发态吸收过程;红光发射主要源于Er3+离子4I13/2能级与4I11/2能级之间的能量转移过程.980nmLD激发产生的绿光主要源于Er3+离子4I11/2能级之间的能量转移过程;而红光发射主要源于Er3+离子4I13/2能级与4I11/2能级之间的能量转移过程和4I13/2能级的激发态吸收过程.通过量子效率分析,发现采用800nmLD激发Er3+离子掺杂浓度为1mol% 的样品时,上转换绿光发光效率最高.
关键词:
上转换发光机理
3+离子掺杂')" href="#">Er3+离子掺杂
钡镓锗玻璃 相似文献
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High near-infrared transparency Tm3+-doped germanate bulk glass and fiber have been fabricated and 2 μm emission properties demonstrated. Energy-transfer processes
in the germanate glass and fiber are discussed. The emission spectra are obtained from both bulk glass and fiber with the
excitation of a 794 nm laser diode. The results indicate that the line width of the Tm3+:3F4→3H6 emission spectra measured in fibers is narrower than that of the bulk glass sample and shifts to longer wavelengths with
increment of fiber length. The extended overlap integral method is used to calculate the microparameters of energy transfer
and critical distance. A model is derived to better understand of the energy-transfer process of thulium ions in the germanate
glasses responsible for emission at 2 μm. The study indicates that Tm3+-doped germanate fibers with a large core diameter has proved to be promising infrared optical and high-power level laser
materials. 相似文献