共查询到17条相似文献,搜索用时 93 毫秒
1.
研究了以Co2+:MgAl2O4晶体为饱和吸收体的LD抽运Er3+,Yb3+共掺磷酸盐玻璃激光器.针对双掺离子之间的能量传递和Er3+的多种跃迁过程,结合Co2+:MgAl2O4晶体中Co2+离子的饱和吸收特性,给出了详尽的速率方程,在其基础上进行了数值分析,分析了输出镜透过率、激光介质长度、谐振腔长度、腔内往返损耗、饱和吸收体长度对激光阈值、峰值功率、单脉冲能量以及脉冲宽度的影响. 相似文献
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报道了一种主要应用于激光测距的微型化激光二极管泵浦Er3+/Yb3+共掺磷酸盐玻璃被动调Q激光器。采用中心波长940 nm的二极管作为泵浦源,Er3+/Yb3+共掺磷酸盐玻璃作为增益介质,Co2+:MgAl2O4作为被动调Q晶体,通过优化增益介质和被动调Q晶体参数,获得了最佳的增益介质长度和被动调Q晶体初始透过率。当泵浦能量14 mJ,重复频率10 Hz,泵浦脉宽5 ms时,获得了单脉冲能量480 J,脉宽5 ns,峰值功率大于20 kW的激光输出,激光光束质量因子为1.2。 相似文献
3.
制备了Er3+和Yb3+共掺的碲钨酸盐玻璃样品65TeO2-25 WO3-10RmOn(RmOn=PbO,BaO),(65+x)TeO2-(25-x)WO 3-10La2O3 (x=0,5,10), (60+x)TeO2-(30 -x)WO3-10Bi2O3 (x=0,5,10).测试了玻璃样品的吸收光谱、荧光光谱、能级寿命及热稳定性能.结果表明除含Bi 2O3的碲钨酸盐玻璃外,其余玻璃样品均没出现析晶开始温度(Tx),说明碲钨酸盐 是一种适合于光纤拉制的玻璃基质材料.应用Judd-Ofelt理论计算了强度参数Ωt(t=2, 4,6),研究表明Ω2在碲钨酸盐玻璃中主要受到Er-O键的共价性的影响,而Er3 + 离子周围配位场的非对称性影响可以忽略.测得了Er3+在15 μm发射谱的荧光 半高宽 (FWHM=71—77nm)和Er3+的4I13/2能级寿命 (τm=3—34 ms).应用McCumber理论计算了Er3+在15 μm处的受激发射截面(σpeak=068—103×10-20 cm2).比较了Er3+在不同玻璃基质里 的15 μm荧光带宽和发射截面,研究结果表明碲钨酸盐玻璃是一种制备宽带光纤放大器的理想基质材料. 相似文献
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采用高温熔融法制备了组分为TeO2-ZnO-Na2O的Tm3+离子单掺和Tm3+/Yb3+共掺碲酸盐玻璃,应用Judd-Ofelt理论计算分析了玻璃样品的强度参量Ωt(t=2, 4, 6),自发辐射跃迁几率A,荧光分支比β和荧光辐射寿命τrad等光谱参量,测量得到了不同Yb3+离子掺杂浓度下玻璃样品的Tm3+离子上转换发光谱.结果显示,在980 nm泵浦光激励下玻璃样品发射出强烈的近红外上转换荧光.对Tm3+离子上转换发光分析表明,强烈的Tm3+离子近红外上转换发光主要来自于Yb3+/Yb3+离子间的共振能量传递以及基于单声子和双声子辅助的Yb3+/Tm3+离子间的非共振能量传递过程,并进一步计算得到了声子贡献比和能量传递系数.最后,计算分析了Tm3+:3F4→3H6能级间跃迁的1.8 μm波段吸收截面、受激发射截面和增益系数.研究表明,Yb3+/Tm3+共掺TeO2-ZnO-Na2O玻璃可以作为近红外波段固体激光器的潜在增益基质. 相似文献
6.
报道了一种主要应用于激光测距的微型化激光二极管泵浦Er3+/Yb3+共掺磷酸盐玻璃被动调Q激光器。采用中心波长940nm的二极管作为泵浦源,Er3+/Yb3+共掺磷酸盐玻璃作为增益介质,Co2+:MgAl2O4作为被动调Q晶体,通过优化增益介质和被动调Q晶体参数,获得了最佳的增益介质长度和被动调Q晶体初始透过率。当泵浦能量14mJ,重复频率10Hz,泵浦脉宽5ms时,获得了单脉冲能量480μJ,脉宽5ns,峰值功率大于20kW的激光输出,激光光束质量因子为1.2。 相似文献
7.
Er3+单掺及Er3+/Yb3+共掺SiO2-Al2O3-La2O3玻璃光谱性质研究 总被引:10,自引:4,他引:6
研究了单掺Er3+及Er3+/Yb3+共掺SiO2-Al2O3-La2O3玻璃的光谱性质随稀土离子浓度变化规律,应用McCumber理论计算了玻璃在1.53 μm的发射截面及积分吸收截面.结果表明:在Er3+离子掺杂浓度相同时,玻璃在980 nm吸收截面与Yb3+掺杂浓度成反比;当样品中Yb3+离子掺杂浓度为3.94×1020 cm-3时,玻璃在1.53 μm的吸收截面和发射截面最大,在1.40~1.60 μm积分吸收截面也最大;Er3+/Yb3+共掺SiO2-Al2O3-La2O3玻璃在1.53 μm的荧光半高宽随Er3+掺杂浓度升高而增加,当Er3+离子掺杂浓度为2.41×1020 cm-3时,玻璃的荧光半高宽(FWHM)达到52.5 nm. 相似文献
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采用高温熔融退火法制备了系列 80TeO2-10Bi2O3-10TiO2-0.5Er2O3-xCe2O3 (x=0,0.25, 0.5,0.75,1.0 mol%)和(80-y) TeO2-10Bi2O3-10TiO2-yWO3-0.5Er2O3-0.75Ce2O3 (y=3,6,9,12 mol%)的碲铋酸盐玻璃.测试了玻璃样品400-1700 nm范围内的吸收光谱, 975 nm抽运下的上转换发光谱和1.53 μm波段荧光谱, 以及808 nm激励下的Er3+离子荧光寿命和无掺杂玻璃样品的Raman光谱, 并结合Judd-Ofelt理论和McCumber理论计算了Er3+离子光谱参数.结果表明, 在掺Er3+碲铋酸盐玻璃中引入Ce3+离子进行Er3+/Ce3+共掺, 通过Er3+离子4I11/2能级与Ce3+离子2F5/2 能级间基于声子辅助的能量传递过程,可以有效抑制Er3+离子上转换发光并明显增强其 1.53 μm波段荧光;同时,在现有Er3+/Ce3+共掺玻璃组分基础上引入WO3, 可进一步提高1.53 μm波段荧光并展宽其荧光发射谱. 研究结果对于获取优异光谱特性的宽带掺Er3+光纤放大器玻璃基质具有实际意义. 相似文献
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研究了Cr3+,Yb3+,Er3+共掺磷酸盐铒玻 璃转镜调Q激光性质.三种Er2O3掺杂浓度的激光实验结果表明,在Er2O3名义掺杂浓 度为0.5wt%时,玻璃的综合激 光性质最好,重复频率为0.1Hz时,它的激光阈值功率为14.5mJ,最大输出能量为9.6mJ ,斜率效率为0.55%.在同种实验条件下,比较了Cr14和Kigre公司生产的QE-7S激光性质参数,实验表明,前者激光阈值功率稍低,而后者的斜率效率和最大输出功率略高.
关键词:
3+-Yb3+-Er3+共掺')" href="#">Cr3+-Yb3+-Er3+共掺
磷酸 盐玻璃
光谱性质
激光性质 相似文献
11.
Optical temperature sensor based on up-conversion fluorescence emission in Yb3+:Er3+ co-doped ceramics glass
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Yb3+:Er3+co-doped oxy-fluoride ceramics glass has been prepared.The mechanism of up-conversion emissions about Er3+was discussed,and the temperature properties of green up-conversion fluorescence between 303 and 823 K were investigated.The results show that the sensitivity of this sample reaches its maximum value,about 0.0047 K 1,when the temperature is 383 K,indicating that this kind of sample can be used as high temperature and high sensitivity optical temperature sensor. 相似文献
12.
Up-conversion photoluminescence characteristics of Yb3+:Er3+:Tm3+ co-doped borosilicate glasses
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Yb3+:Er3+:Tm3+ co-doped borosilicate glasses are prepared.Their strong up-conversion photoluminescence spectra in a range from ultra-violet to near-infrared,which are excited by a 978-nm laser diode,are measured,and the mechanisms of energy transfer among Yb3+,Er3+ and Tm3+ ions are discussed.The results show that there is an unexpected wavelength at 900-nm emission from Yb3+ Stark splitting levels to pump Tm3+ ions and there exists an optimum pump power.The concentration of the Tm3+ dopant gives rise to a prominent effect on the intensity of visible and near-infrared emissions for the Yb3+:Er3+:Tm3+ co-doped borosilicate glasses. 相似文献
13.
Spectroscopic properties and mechanism of Tm^3+/Er^3+/Yb^3+ co-doped oxyfluorogermanate glass ceramics containing BaF2 nanocrystals
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Transparent Tm^3+/Er^3+/yb^3+ co-doped oxyfluorogermanate glass ceramics containing BaF2 nanocrystals are prepared. Under excitation of a 980-nm laser diode (LD), compared with the glass before heat treatment, the Tm^3+/Er^3+/yb^3+ co-doped oxyfluorogermanate glass ceramics can emit intense blue, green and red up-conversion luminescence and Stark- split peaks; X-ray diffraction (XRD) and transmission electron microscope (TEM) results show that BaF2 nanocrystals with an average diameter of 20 nm are precipitated from the glass matrix. Stark splitting of the up-conversion luminescence peaks in the glass ceramics indicates that Tm^3+, Er^3+ and (or) Yb^3+ ions are incorporated into the BaF2 nanocrystals. The up-conversion luminescence intensities of Tm^3+, Er^3+ and the splitting degree of luminescence peaks in the glass ceramics increase significantly with the increase of heat treat temperature and heat treat time extension. In addition, the possible energy transfer process between rare earth ions and the up-conversion luminescence mechanism are also proposed. 相似文献
14.
通过固相反应法制备了Er3+/Yb3+共掺杂ZrO2-Al2O3粉末的样品,并对样品在980nm激光激发下的上转换发光特性进行了研究.从发射光谱可以发现,在可见光范围内有3个强的发光带,一个位于654nm附近的红光带和两个分别位于545nm、525nm附近的绿光带,分别对应于Er3+离子的以下辐射跃迁:4F9/2→4I15/2、4S3/2→4I15/2、 2H11/2→4I15/2.其中又以Er3+离子的4F9/2→4I15/2跃迁产生的红色荧光辐射最强.对其上转换发光机制进行了分析,发现这三个发光过程都是双光子过程.对样品粉末进行了XRD检测,发现ZrO2主要以立方相为主,并且计算得到了这种立方结构的晶格常数.Al2O3固溶于ZrO2中,Al3+嵌入ZrO2后产生氧空位,导致ZrO2晶体的对称性降低,这种结构变化更有利于提高上转换效率,即上转换发光强度增强.
关键词:
3+/Yb3+')" href="#">Er3+/Yb3+
上转换
2-Al2O3')" href="#">ZrO2-Al2O3
荧光
稀土 相似文献
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The Er^3+/Yb^3+ co-doped TeO2-Nb2O5-Li2O glass is prepared by conventional melting method, and its upconversion spectra are measured. The intense green upconversion luminescence upon excitation with a 976 nm laser diode is observed with the naked eyes. The dependence of luminescence intensity on the ratio of Yb^3+/Er^3+ is discussed in detail, and the relationship between the ratio of green luminescence intensity to red luminescence intensity and the ratio of Yb^3+/Er^3+ is also studied, The luminescence intensity increases with the ratio of Yb^3+/Er^3+ increasing. The ratio of Yb^3+/Er^3+ plays a more important role than the concentration of Er^3+ in determining the upconversion luminescence intensity. The ratio of green luminescence intensity to red luminescence intensity reaches a maximum when ratio of Yb^3+/Er^3+ is 3. Thus the glass could be one of the potential candidates for LD pumping solid-state lasers. 相似文献
17.
Optical parameters of Nd3+:Er3+:yb3+ co-doped borosilicate glasses and their energy transfers at high temperature
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This paper reports that a series of Nd3+:Er3+:Yb3+ co-doped borosilicate glasses have been prepared and their absorption spectra measured. The J--O intensity parameters Ωk (k=2, 4, 6), spontaneous radiative lifetime τrad, spontaneous transition probability A, fluorescence branching ratio β and oscillator strength fed of the Nd3+ ions at room temperature are calculated based on Judd--Ofelt (J--O) theory. The temperature dependence of the up-conversion photoluminescence characteristics in a Nd3+:Er3+:Yb3+ co-doped sample is studied under a 978 nm semiconductor laser excitation, and the energy transfer mechanisms among Yb3+, Er3+ and Nd3+ ions are analysed. The results show that the J--O intensity parameters Ω2 increase when the Nd3+ concentration of the Nd3+:Er3+:Yb3+ co-doped borosilicate glasses increases. The possibility of spontaneous transition is small and lifetimes are long at levels of 4F5/2 and 4F3/2. The intensity of Nd3+ emissions at 595, 691, 753, 813 and 887 nm are markedly enhanced when the sample temperature exceeds 400 K. The reasons being the cooperation of the secondary sensitization from Er3+ to Nd3+ and the contribution of a multi-phonon. 相似文献