两个光纤激光器的相位锁定及高相干功率输出

研究了两个光纤激光器的相位锁定及其相干输出。将两个光纤激光器的输出耦合进一个自成像共振腔，然后利用一个空间滤波器进行模式选择。自成像共振腔由两个焦距为8mm的准直透镜、一个焦距为500mm的傅里叶透镜和一个耦合输出镜组成。滤波器由两根20μm的铂金线组成，并放置在耦合输出镜面上。实验中，观测到光束截面图样具有高对比度的干涉条纹。输出镜反射率在50％和30％情况下，分析了单个激光器和激光器阵列的斜率效率。在总抽运功率为60W时，获得了18．3W的高相干功率输出。稳定的相位锁定是由于激光器阵列具有能适应光程长

两根大芯双包层光纤激光器获得60W相干输出

报道了一个相位锁定的光纤激光器阵列获得60W的输出，同相模式输出时的斜率效率为37％。对于两种不同的纤芯距离都观测到稳定的高对比度干涉条纹。整个系统在高功率操作时，所用的空间滤波器没有观察到明显的热问题，这充分说明了采用这种方法能够进一步提高相干输出功率。

高功率脉冲双包层光纤激光器的新进展

对高功率脉冲双包层光纤激光器的国内外研究进展进行评述，通过建立了小信号瞬态增益模型，对脉冲激光信号经过双包层光纤放大后的波形进行了数值模拟。分析了基于MOPA方式脉冲双包层光纤激光器的几个问题，报道了中科院上海光机所采用振荡-放大（MOPA）方法获得133．8W平均功率脉冲放大输出的实验结果。

两根掺镱大芯双包层光纤激光器获得113W同相输出功率

利用一个自成像共焦腔和一个空间滤波器实现了两掺Yb大芯光纤激光器的位相锁定。观测到稳定的具有高对比度的干涉条纹。相干条纹的对比度为59%，而非相干时对比度为6%。中心条纹的宽度与理论计算结果吻合得很好。对同相模式而言，位相锁定激光器阵列输出达到113W，对应的斜率效率为38.5%。

光纤激光器及其相干组束

简述了光纤激光器的发展历史，重点介绍了双包层光纤激光器的进展并给出了高功率双包层光纤激光器的最新研究结果。评述了目前国内外高亮度激光的关键技术：光纤激光器的相干组束。介绍了几种典型的相干组束技术并分析了其工作原理。最后给出了相干组束研究的最新结果。

光纤激光器自成像腔相干组束研究

探讨了3种不同自成像腔，即Talbot腔、自傅里叶变换腔（SF）和傅里叶变换自成像腔实现相干组束的机理和技术难点。介绍了利用光纤激光器，采用傅里叶变换自成像方法，实现1维2路和2维4路激光相干组束的实验情况，功率分别达到122W以及26W。

两微米瓦级掺铥短光纤激光器

以短的高掺杂浓度的掺铥硅基光纤为增益介质，采用790 nm波长的激光二极管(LD)为抽运源，得到了波长为2 μm的高功率激光输出。当光纤长度为7 cm时，激光器的阈值泵浦功率为135 mW，最大输出功率为1.09 W，斜率效率为9.6%(相对于耦合进光纤的抽运功率)。该激光器的输出稳定性在5%以内。此外，我们还观察分析了工作温度和其他腔结构参量对该激光器工作性能的影响。

侧面泵浦的短矩形掺钕磷酸盐玻璃光纤激光器

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％。

稀土离子掺杂的多组分玻璃光纤

abstract {Rare earth ions doped multi-component glass fibers have important application in broad band fiber amplifier and up-conversion fiber lasers. In this paper, the mechanism and the progress of study on rare earth ions doped multi-component glass fibers in broad band fiber amplifier and up-conversion fiber lasers are introduced and reviewed. The questions and the applications of rare earth ions doped multi-component glass fibers in the future are also prospected. Based on the present research progress, it is suggested to further study the tellurite and bismuth glasses, which are used as fiber materials in broad band fiber amplifier. To up-conversion fiber laser, it is still need to further investigate novel glasses, which has low phonon energy and good physical and chemical properties.}

上转换亚碲酸盐光纤激光器研究进展

亚碲酸盐玻璃由于具有较低的声子能量，加上其优良的化学稳定性、热稳定性和机械强度及其光学性能，其可作为光纤放大器和上转换光纤激光器的较理想的基质材料。文章介绍了上转换激光器的主要原理，并回顾了亚碲酸盐玻璃上转换激光器的研究进展。

Intense upconversion luminescence and effect of local environment for Tm3+/Yb3+ co-doped novel TeO2-BiCl3 glass system

We present the results of a study that uses theoretical and experimental methods to investigate the characteristics of the upconversion luminescence of Tm3+/Yb3+ codoped TeO2-BiCl3 glass system as a function of the BiCl3 fraction. These glasses are potentially important in the design of upconversion fiber lasers. Effect of local environment around Tm3+ on upconversion fluorescence intensity was analyzed by theoretical calculations. The structure and spectroscopic properties were investigated in the experiments by measuring the Raman spectra, IR transmission spectra, and absorption and fluorescence intensities at room temperature. The results indicate that blue luminescence quantum efficiency increases with increasing BiCl3 content from 10 to 60 mol%, which were interpreted by the increase of asymmetry of glass structure, decrease of phonon energy and removing of OH- groups. (c) 2005 Elsevier B.V. All rights reserved.

Investigation on upconversion luminescence in Er3+/Yb3+ codoped tellurite glasses and fibers

The upconversion properties of Er3+/Yb3+ codoped tellurite glasses and glass fibers with D-shape cladding under 980 mu excitation were investigated. Intense emission bands centered at 531, 546 and 658 nm corresponding to the transitions Er3+: H-2(11/2) -> I-4(15/2) , S-4(3/2) -> I-4(15/2) and F-4(9/2) -> I-4(15/2), respectively, were observed at room temperature. Compared with that in Er3+/Yb3+ codoped tellurite bulk glass, the upconversion luminescence becomes more efficient in the fiber geometry. The dependence of upconversion intensities on fiber geometry and possible upconversion mechanism are discussed and evaluated. The presented Er3+/Yb3+ codoped tellurite fibers with intense upconversion luminescence can be used as potential host materials for upconversion fiber lasers. (c) 2005 Elsevier B.V. All rights reserved.

Near-infrared luminescent mesoporous MCM-41 materials covalently bonded with ternary thulium complexes

Two beta-diketones 4,4,4-trifluoro-1-2-thenoyl-1,3-butanedione (Htta) and 4,4,4-trifluoro-1-(2-naphthyl)-1,3-butanedione (Htfnb), which contain trifluoroalkyl chain, were selected as the main sensitizer for synthesizing Tm(L)(3)phen (L = tta, tfnb) complexes. The two near-infrared (NIR) luminescent thulium complexes have been covalently bonded to the ordered mesoporous material MCM-41 via a functionalized 1,10-phenanthroline (phen) group 5-(N,N-bis-3-(triethoxysilyl)propyl)ureyl-1,10-phenanthroline (phen-Si) [The resultant mesoporous materials are denoted as Tm(L)(3)phen-MCM-41 (L = tta, tfnb)]. The Tm(L)(3)phen-MCM-41 (L = tta, tfnb) mesoporous materials were characterized by small-angle Xray diffraction (XRD) and N-2 adsorption/desorption, and they show characteristic mesoporous structure of MCM-41.

High power 980 nm Al-free strained quantum-well lasers for erbium-doped fiber amplifiers

In this paper, we reported on the fabrication of 980 nm InGaAs/InGaAsP strained quantum-well (QW) lasers with broad waveguide. The laser structure was grown by low-pressure metalorganic chemical vapor deposition on a n(+)- GaAs substrate. For 3 mu m stripe ridge waveguide lasers, the threshold current is 30 mA and the maximum output power and the output power operating in fundamental mode are 350 mW and 200 mW, respectively. The output power from the single mode fiber is up to 100 mW, the coupling efficiency is 50%. We also fabricated 100 mu m broad stripe coated lasers with cavity length of 800 mu m, a threshold current density of 170 A/cm(2), a high slope efficiency of 1.03 W/A and a far-field pattern of 40 x 6 degrees are obtained. The maximum output power of 3.5 W is also obtained for 100 mu m wide coated lasers. (C) 2000 Elsevier Science B.V. All rights reserved.

High power 980 nm Al-free strained quantum-well lasers for erbium-doped fiber amplifiers

In this paper, we reported on the fabrication of 980 nm InGaAs/InGaAsP strained quantum-well (QW) lasers with broad waveguide. The laser structure was grown by low-pressure metalorganic chemical vapor deposition on a n(+)- GaAs substrate. For 3 mu m stripe ridge waveguide lasers, the threshold current is 30 mA and the maximum output power and the output power operating in fundamental mode are 350 mW and 200 mW, respectively. The output power from the single mode fiber is up to 100 mW, the coupling efficiency is 50%. We also fabricated 100 mu m broad stripe coated lasers with cavity length of 800 mu m, a threshold current density of 170 A/cm(2), a high slope efficiency of 1.03 W/A and a far-field pattern of 40 x 6 degrees are obtained. The maximum output power of 3.5 W is also obtained for 100 mu m wide coated lasers. (C) 2000 Elsevier Science B.V. All rights reserved.