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制备了新的Er3+/Yb3+共掺氟氧硅酸盐微晶玻璃,测试了荧光光谱、吸收光谱。研究了氟氧化物微晶玻璃中Er3+离子的上转换发光特性,采用Judd-Ofelt理论对样品光谱进行了分析,拟合得到了强度参数,Ω2=4.4756,Ω4=1.0059,Ω6=1.2098。计算了样品的辐射寿命、跃迁几率、荧光分支比等光谱参数。结果表明,样品通过热处理形成了氟化物微晶,降低了声子能量,提高了上转换效率。绿光、红光上转换荧光强度比玻璃样品增强约2到3倍。Judd-Ofelt理论分析表明Er3+/Yb3+共掺氟氧微晶玻璃具有较高的上转换效率,是制作微型激光器和三维立体显示的优良材料之一。 相似文献
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In experimental and theoretical study of anomalous dispersion in Er3+and Er3+-Yb3+-doped fibers has been developed. Anomalous time delay caused by both absorption and emission at 1.535 μm has been theoretically calculated and experimentally measured. A pump power dependence of anomalous time delay in rare-earth-doped fibers has been theoretically calculated and experimentally investigated. It has been shown that pump power fluctuations lead to propagation time jitter in Er3+-doped fiber amplifiers. The pulse interaction due to refractive index change caused by gain saturation is predicted. It has been shown that for Er 3+-doped fibers with SiO2-GeO2 core composition, the anomalous dispersion per 1-dB gain is twice that of fibers with SiO2-Al2O3 core, which is caused by gain curve form difference. A scheme of mutual compensation of intrinsic fiber dispersion and anomalous dispersion caused by Er3+ in the region 1.532-1.537 μm has been suggested 相似文献
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《Quantum Electronics, IEEE Journal of》2007,43(2):157-167
The continuous-wave laser operation of Nd-doped tetragonal NaLa(WO 4)2 crystal is studied at room temperature by optical pumping in the spectral region overlapping AlGaAs diode laser emission. This crystal has inhomogeneously broadened optical bands. From the room-temperature spectroscopic parameters determined it is found that the optimum Nd concentration for the 4F3/2rarr4IJ laser channels must be in the 3-5 at.% range. For J=11/2 and 13/2 channels (lambdaap1.06 and 1.3 mum) the most favourable polarization configuration is parallel to the crystallographic c axis, while for J=9/2 little polarization dependence of the laser efficiency is predicted. Laser operation was achieved with a 3.35 at.% Nd-doped sample grown by the Czochralski method. The laser operation was tested in an hemispherical optical cavity pumped by a Ti:sapphire laser. Stimulated emission at lambda=1056 nm was achieved for a wide spectral pumping range, lambda=790-820 nm. Stimulated Raman scattering was achieved in the picosecond regime with an efficiency similar to that of monoclinic KY(WO4)2 reference compound 相似文献
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Junhai Liu Mateos X. Huaijin Zhang Jing Li Jiyang Wang Petrov V. 《Quantum Electronics, IEEE Journal of》2007,43(5):385-390
High-power continuous-wave laser operation near 1 mum was demonstrated at room temperature with c-cut and a-cut Yb:YAl3(BO3)4 crystals end-pumped by a fiber-coupled diode laser. Using a 2-mm-thick c-cut crystal, 10.6 W of output power was generated with an optical-to-optical efficiency of 65% and a slope efficiency of 72%. The complex polarization state of the generated laser radiation was also studied. With a 2-mm-thick a-cut crystal, sigma-polarized laser oscillation was obtained, producing a maximum output power of 8.1 W; the optical-to-optical and slope efficiencies were 56% and 61%, respectively. Complete absorption and emission cross section spectra of the Yb:YAl3(BO3) 4 crystal were also derived, revealing very strong anisotropy of the spectroscopic properties 相似文献
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Minelly J.D. Barnes W.L. Laming R.I. Morkel P.R. Townsend J.E. Grubb S.G. Payne D.N. 《Photonics Technology Letters, IEEE》1993,5(3):301-303
Single-mode double-clad Er3+/Yb3+ co-doped fibers are shown to be suitable for diode array pumping at around 960 nm. A fiber laser with 96-W output power at 1.53 μm and a power amplifier exhibiting a small signal gain of 24 dB and a saturated output power of +17 dBm are reported 相似文献
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Auge F. Druon F. Balembois F. Georges P. Brun A. Mougel F. Aka G. Vivien D. 《Quantum Electronics, IEEE Journal of》2000,36(5):598-606
We present a theoretical and experimental analysis of a diode-pumped Yb3+-doped Ca4GdO(BO3)3 (Yb:GdCOB) laser. A new model for a diode-pumped quasi-three-level laser is described. The effects of absorption saturation, temperature profile, and the beam quality M2 factor of the pump diode have been taken into account, for the first time to our knowledge. We have obtained a good agreement between experimental measurements and theoretical calculations with two different pump wavelengths, 902 and 976 nm. Our model has given good predictions of the laser performances for different crystal temperatures and different M2 factors of the pump beam. As much as 440 mW of output power (at 1082 nm) have been achieved for 640 mW of absorbed pump power at 976 nm, corresponding to one of the highest slope efficiencies (81%) ever obtained with Yb-doped lasers 相似文献
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Barnes W.L. Poole S.B. Townsend J.E. Reekie L. Taylor D.J. Payne D.N. 《Lightwave Technology, Journal of》1989,7(10):1461-1465
Single-mode fiber lasers operating at ~1.57 μm are described. Output powers of >2 mW are reported for laser diode pumped operation. Direct comparison is made between fiber lasers using sensitized erbium (Er3+ and Yb3+) and erbium on its own. The performance of Er3+-Yb3+ fiber lasers is analyzed in more detail as a function of fiber length. Both CW and Q-switched operations are studied and the results obtained demonstrate that practical sources at 1.5 μm are available from diode pumped Er3+ -Yb3+ systems 相似文献
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掺Er~(3+)和掺Er~(3+)/Yb~(3+)光纤中1313nm到780nm的频率上转换过程 总被引:1,自引:0,他引:1
研究了在连续锁模和调Q锁模两种脉冲泵浦条件下,掺Er(3+)和掺E3+/Yb3+单模GeO2/SiO2石英光纤中,1313nmNd:YLF激光到780nm波长的频率上转换过程。Er3+离子在共振吸收两个光子后到4F9/2态,再经快速的无辐射转移到4I9/2态.形成780nm辐射。在连续锁模泵浦条件下.1313nm至780nm的转换效率比调Q锁模条件下更高.而后者的峰值功率是前者的几百倍。 相似文献
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双包层Er3+/Yb3+共掺光纤放大器动态特性研究 总被引:1,自引:0,他引:1
基于速率方程的离散算法,实现了对双包层Er3+/Yb3+光纤放大器动态特性的分析.研究了不同信号和泵浦功率下单信道的瞬态功率、脉冲序列输出功率与增益随时间的变化以及多信道异步转移模式下输出功率和增益随时间的变化.结果表明对于单个脉冲,在相同的泵浦功率下,输出脉冲的峰值功率取决于输入脉冲的峰值功率;在不同的泵浦功率下,输出脉冲的峰值功率取决于泵浦功率.对于脉冲序列,在达到稳定的输出前,将经历一个输出功率和增益由高到低的变化过程.对于异步转移模式的多信道脉冲,脉冲重叠时的功率和增益变化要快于非重叠时功率和增益的变化. 相似文献
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K.Tran Ngoc H. Pham Thanh C. Nguyen Duc C. Armellini A. Chiaserat M. Ferrari Y. Jestin M. Montagna E. Moser S. Pelli G.C. Righini 《光电子快报》2006,2(5):354-357
Er~(3 )-activated silicate glasses are recognized of tech-nological interest in several areas and,in particular ,it iswell known for their successful application in opticalamplification at the C band (1530 -1565 nm) of tele-communications[1].Inside this l… 相似文献
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报道了一种应用于激光测距的Er3+,Yb3+:glass/Co2+:MgAl2O4复合材料LD泵浦的被动调Q微型激光器。 采用玻璃与晶体复合技术,将增益介质Er3+/Yb3+共掺 磷酸盐玻璃和被动调Q可饱和 Co2+:MgAl2O4晶体进行了光学热复合,复合材料会降低增益介质内部的温度梯度 ,使热焦距变长,模体积 增加,激光光束质量提高;另外,复合材料使腔内损耗减小,腔内的粒子数密度提高,脉宽 变窄,输出能 量增加,从而激光器性能得到提高。在重复频率为10Hz情况下,采 用中心波长为940nm的单管LD作为泵 浦源,获得单脉冲能量为210μJ、脉冲宽度为2.8ns,峰值功率大于70kW的波长为1.5 μm的被动调Q激光输出,光束质量为1.2 相似文献
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Vienne G.G. Caplen J.E. Liang Dong Minelly J.D. Nilsson J. Payne D.N. 《Lightwave Technology, Journal of》1998,16(11):1990-2001
Fabrication process of efficient Yb3+,Er3+ codoped phosphosilicate fibers by modified chemical vapor deposition (MCVD) combined with the solution doping technique is studied in detail. We show that the process can be adapted to incorporate low viscosity phosphate glass and some important issues in the fabrication process are discussed. These include the sensitive presintering pass. We also report on the fabrication of a low loss all-glass double clad Yb3+:Er3+ codoped fiber. We explain how we evaluate the fibers and discuss the effect of the ytterbium to erbium concentration ratio on the laser characteristics. Finally, we present results of some investigations into the mechanisms which can affect the efficiency of the lasers, and show that the detrimental up-conversion from the metastable level of the erbium ions is dramatically reduced by the presence of the ytterbium ions 相似文献
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Laser emission is reported in an Er+3-doped ZrF4 -based fluoride glass often referred to as `heavy metal fluoride glass' (HMFG). The laser operates at room temperature at a wavelength of 2.78 μm. The glass is a standard ZBLAN formulation in which all of the LaF3 (4 mol.%) is replaced by ErF3. Glass preparation, spectroscopy and laser data are presented and discussed 相似文献
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目前1.5m LD泵浦铒玻璃被动调Q微型激光器是军事激光测距的研究热点,获得较高的激光重复频率和单脉冲能量尤为重要。文中主要报道了一种应用于激光测距领域的铒镱共掺磷酸盐玻璃被动调Q微片激光器。激光器采用中心波长为940 nm的单管二极管为泵浦源,铒镱共掺磷酸盐玻璃(Er3+,Yb3+:glass)作为增益介质,CO2+:MgAl2O4(CO:MALO)作为可饱和吸收体。通过分析泵浦光斑半径对模式匹配影响,优化泵浦光斑半径,实验分析可饱和吸收体初始透过率T0和输出镜反射率R对输出激光参数影响,优化T0和R值。最终实验中采用增益预泵浦方式,实现重频1 kHz,单脉冲能量40 J,脉宽5.09 ns,峰值功率7.85 kW,光束质量M2=1.4,波长1 535 nm的稳定激光输出。 相似文献
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用干涉法测量了低对称晶体GdCa4O(BO3)3的全部电光系数。为了分离测量交叉电光系数γ51,γ53,γ42和γ62,采用了新的样品趋向。测量结果为:γ11=0.4pm/V,γ21=0.5pm/V,γ31=0.6pm/V,γ13=0.1pm/V,γ23=0.4pm/V,γ33=2.0pm/V,γ51=0.7pm/V,γ42=0.5pm/V,γ62=0.8pm/V。 相似文献