Spectral and Lasing Properties of Er^(3+0/Yb^(3+) Co-Doped Phosphate Glasses Pumped by LD

Er^3 ＋/Yb^3 ＋ phosphate glasses were fabricated. According to McCumber theory, the stimulated emission cross-section of Er^3＋ ions at 1533 nm was calculated on the basis of absorption spectrum, and 0.84 × 10^-20 cm^2 is derived, the fluorescence lifetime of ^4I13/2 level is 8.5 ms. An Er^3＋/Yb^3＋ co-doped phosphate glass CW laser pumped by LD was demonstrated at room temperature. The maximum output power is 80 mW and slope efficiency is 16.5%.

Effect of Network Modifiers on Spectroscopic Properties of Erbium-doped Phosphate Glasses

The integrated absorption cross section Σ abs, peak emis sion cross section σ emi, Judd-Ofeld intensity parameters Ω t(t=2,4,6), and spontaneous emission probability A R of Er 3+ ions were determined fo r Erbium doped alkali and alkaline earth phosphate glasses. It is found the comp ositional dependence of σ emi is almost similar to that of Σ abs, wh ich is determined by the sum of Ω t (3Ω 2+10Ω 4+21Ω 6). In addition, the compositional dependence of Ω t was studied in these glass systems. As a resu lt, compared with Ω 4 and Ω 6, the Ω 2 has a stronger compositional depend ence on the ionic radius and content of modifiers. The covalency of Er-O bonds in phosphate glass is weaker than that in silicate glass, germanate glass, alumi nate glass, and tellurate glass, since Ω 6 of phosphate glass is relatively la rge. A R is affected by the covalency of the Er 3+ ion sites and correspon ds to the Ω 6 value.

Optical Properties of a Novel Trivalent Erbium Ions Doped into Phosphate Glass

A novel Er (3+)-doped (ZnO)(P_2O_5)(B_2O_3) glass with excellent optical properties was prepared. The glasses were proved to have high stability by the investigation of the durability in boiling water. The properties of their spectra at about 1.5 μm change a lot with the concentrations of both Er (3+) and B_2O_3. Compared with Er (3+)-doped into the borate glass and the zinc phosphate glass,the glass prepared in our laboratory shows a larger quenching concentration and a much broader emission band at 1.54 μm.

Effect of SiO_2 On the Spectroscopic Properties of Yb-Er Co-doped Phosphate Glass

yb^3＋-Er^3＋ co-doped Na20-Al2O3-SiO2-P2O5 glasses with different SiO2 content have been fabricated and characterized. Absorption and emission spectra were measured. Judd-Ofelt theory and McCumber theory are performed to analyze the measured absorption spectra. The Judd-Ofelt intensity parameters Ω4 and Ω6 decrease with increasing SiO2 content. The emission cross-section of Er^3＋ decreases from 0.82×10^-20cm^2 to 0.76 × 10^-20cm^2 as the SiO2 content varies from 0 to 20 mol%.

超短脉冲激光在掺Er^(3+)磷酸盐玻璃中制备光波导的实验研究

超短脉冲激光通过非线性吸收调制光学材料折射率提供了一种高效制备集成三维光子器件的途径.掺Er^(3+)磷酸盐玻璃由于其优异的特性以及在1.55μm通信波段附近的发射光谱,成为了集成光学主动增益材料中的研究热点.实验采用重复频率1 kHz,中心波长800 nm,脉冲宽度120 fs的钛宝石飞秒激光放大系统作为制备波导的光源,系统研究了加工参数对激光写入形貌、波导形成及光学特性的影响.实验结果表明,在狭缝整形辅助短焦物镜横向刻写条件下,写入脉冲能量为1.8μJ时,光波导可以在写入速度为10μm/s-160μm的较宽范围内形成;写入速度为40μm/s时,光波导写入脉冲能量参数窗口为1.6μJ-2.0μJ;波导写入深度在125μm-200μm范围时,波导横截面对称性较好且折射率修改明显;近场强度测量结果显示所制备波导近场强度分布对称,导光特性良好.通过有限差分法反推波导区域折射率修改分布,结果显示最大折射率修改为Δn=6.6×10^(-4).截断传输损耗测量结果显示所制备波导的传输损耗低至0.91 dB/cm.

A Passive Q-Switched Microchip Er/Yb Glass Laser Pumped by Laser Diode

A laser-diode-pumped 1.54-μm passive Q-switched erbium doped glass laser was reported. We utilize a laser diode with wavelength of 973nm to pump a 1-mm Er/Yb co-doped phosphate glass with the erbium and ytterbium concentrations of 1 wt.% and 21 wt.%, respectively. A Co^2＋ ：MgAl2O4 slab crystal was used as a passive Q- switcher. Q-switched pulses with repetition frequency of 800Hz, width of 7.4ns, peak power of 2.2kW and average power of 13.3 m W were obtained when absorbed pump power was 4 75 m W. A sandwich structure of the Q- switched microchip Er/Yb glass laser was demonstrated, which shows shorter pulse width of 6.8 ns. Dependences of pulse duration and repetition frequency on pump power were also investigated.

Er^(3+)-Yb^(3+)共掺磷酸盐玻璃平面波导

研制一种新型的Er3+ Yb3+共掺磷酸盐激光玻璃材料,在其上用离子交换方法进行平面光波导制作研究。实验表明,该玻璃在AgNO3+KNO3+NaNO3混合熔盐中具有良好的化学稳定性,为平面光波导放大器的制作提供了实验依据。

Er-Yb共掺磷酸盐波导激光器中的Er-Yb能量传递研究

对Er-Yb共掺磷酸盐玻璃波导激光器进行理论研究,弄清Er-Yb能量传递的作用。利用重叠积分方法,对Er-Yb共掺系统的速率方程及激光器中信号光和泵浦光的传输方程进行求解,在980 nm的泵浦光作用下对光波导激光器中Er-Yb能量传递过程的影响做了详细研究,讨论了Yb-Er能量传递对激光器的增益和输出特性的影响。计算结果表明:Yb-Er能量传递对激光器的增益和输出功率的影响不明显。Yb^(3+)离子在Er^(3+)-Yb^(3+)共掺系统中起化解Er^(3+)离子"团簇"、提高泵浦效率的作用。

Er^(3+)/Yb_(3+)共掺磷酸盐玻璃光纤放大器的增益综述

主要从磷酸盐玻璃光纤的离子掺杂浓度、量子转换效率、信号波长与功率、抽运波长与功率以及光纤长度等方面概述了Er3+/Yb3+共掺磷酸盐玻璃光纤放大器的增益。并简要介绍了国外在该方面的研究进展。

Structural and optical studies of Yb^(3+),Er^(3+) and Er^(3+)/Yb^(3+) co-doped phosphate glasses

Phosphate glass samples with various Yb2O3 and Er2O3 contents were synthesized by the conventional melt quenching technique and characterized by X-ray diffraction, IR absorption spectroscopy and Raman scattering spectroscopy. The absorption, emission spectra and fluorescence decay studies were carried out both at low and room temperatures. Results showed the existence of several sites occupied by the rare earth ions in the phosphate glass. Up-conversion and cooperative fluorescence were also discussed.

Study on the protection of Er-doped phosphate glass waveguide surface in ion-exchange processing

A novel method, sputtering K9 glass film, is proposed to solve the surface corrosion of Er-doped phosphate glass during ion-exchange processing for optical waveguide fabrication. The corrosion causes are analyzed to be the intrinsically weak stabilization of phosphate glass structure, hydrophile and weakly acidic property of phosphate radical. Experimental results show that the K9 glass film could not only protect the Er-doped phosphate glass surface from being corroded but also give no influence on the waveguide fabrication. The effect of thickness of K9 glass film on the optical property of waveguide is also investigated and the op- timal thickness is found to be 60―80 nm. It provides a good base for further fabri- cation of active phosphate glass optical waveguide devices.

Near-infrared carbon-implanted Er^3＋/yb^3＋ co-doped phosphate glass waveguides

The Er3＋/yb3＋ co-doped phosphate （EYDP） glass waveguides operated at 1539 nm have been manufactured by using the implantation technique of carbon ions under the condition of 6.0 MeV energy and 5.0 × 10^13 ions/cm2 fluence in this work. The ion implantation process was computed by means of the stopping and range of ions in matter. The dark-mode spectrum at 1539 nm of the waveguide was recorded by the method of the prism coupling measurement. The microscopic image of the fabricated structure was photographed by an optical microscope. It is the first step for the application of the waveguides on the base of EYDP glasses in optical- integrated photonic devices at near-infrared band.

掺Er^(3+)镓磷酸盐玻璃的光学性质

利用熔融淬火法制备了摩尔分数为40.8Ga2O3-58.0NaPO3-1.2Er2O3掺Er3+镓磷酸盐玻璃,测试并研究了样品中Er3+的吸收光谱、1.5μm发射光谱,根据Judd-Ofelt理论计算了Er3+离子强度参量Ωt(t=2,4,6)及自发辐射概率、荧光分支比、自发辐射寿命.结果表明,Er3+1.5μm发射光谱半峰全宽达到40 nm.同时,利用McCumber方法计算了Er3+4I13/2→4I15/2跃迁的受激发射截面,峰值达到6.10×10-21cm2,测定了Er3+4I13/2能级荧光寿命为4.88 ms,4I13/2能级量子效率为56.3%.

Silver nanoparticles enhanced near-infrared luminescence of Er^3＋/Yb^3＋ co-doped multicomponent phosphate glasses

A new way to improve the 1.53μm emission in Er3＋/Yb3＋ co-doped multicomponent phosphate glass was demonstrated by introducing silver nanoparticles （NPs） in rare-earth doped glass. The existence of Ag NPs was confirmed by absorption spectra and transmission electron microscopy （TEM） measurements. The homogeneous distribution of silver NPs could be observed by the TEM images. UV-Vis-NIR absorption spectra revealed that the surface plasmon band was centered at about 420 nm. The photoluminescence spectra of glass samples were used to investigate the effect of silver NPs on the fluorescence properties of Er3＋. Efficient 1.53μm emis-sion was obtained in prepared samples when pumped at 980 nm laser diode （LD）. The 1.53μm emission intensity could be enhanced 87% by doping 2 mol.% AgCl due to the increased localized field effect in the vicinity of NPs and the possible energy transfer from silver NPs to Er3＋ions. Our present work may point out one way to enhance the gain coefficient of Er3＋/Yb3＋ co-doped glass fiber.

Determination of energy transfer and upconversion constants for Yb^(3+)/Er^(3+) codoped phosphate glass

The energy transfer and cooperation upconversion processes are investigated in Yb3＋/Er3＋ codoped phos- phate glass. Based on the measured curves of output power versus incident power, the laser and spectroscopic parameters of the glass are fitted and analyzed. We focus on the resonant energy transfer constant k from Yb3＋ to Er3＋ as well as the cooperation upconversion coefficient Cup from 4113/2 of Era＋. The fitted k and Cup can give almost the same results for different thicknesses of glass disk with the same dop- ing concentrations. The determination of these parameters is helpful for the development of Yb3＋/Er3＋ codoped laser glass.

掺铒磷酸盐玻璃离子交换波导表面保护的研究

对离子交换波导制备过程中掺铒磷酸盐玻璃表面的侵蚀问题进行了研究,分析了产生侵蚀的原因,提出镀K9玻璃薄膜的方法,对掺铒磷酸盐玻璃表面进行保护.采用光学显微镜和原子力显微镜对波导表面特性进行了表征,同时对平板波导的光学特性进行了测试.研究表明K9玻璃薄膜不仅能够对掺铒磷酸盐玻璃起到保护作用,同时允许交换离子透过进入磷酸盐玻璃形成波导层.

掺铒磷酸盐玻璃反应气氛法除水的研究

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.

LD泵浦的镱铒共掺磷酸盐玻璃的光谱性质和激光性质

制备了Er3+/Yb3+共掺磷酸盐玻璃。通过分析其吸收光谱,根据McCumber理论计算得到了Er3+离子在波长1533 nm处的峰值发射截面为0.84×10-20cm2,4I13/2能级的荧光寿命为8.5 ms。利用激光二极管作为泵浦源,成功地实现了Er3+/Yb3+共掺磷酸盐玻璃激光器的连续运转。在室温下,获得最大激光输出功率为80 mW,斜率效率为16.5%。

铬镱铒共掺磷酸盐玻璃光谱和激光性质研究

测定了Cr14-05铬镱铒共掺磷酸盐玻璃的主要热光参数,并测试了吸收、荧光光谱和激光性能等。结果表明该玻璃具有较好的光谱和热光性质,其激光输出性能可满足人眼安全激光测距光源应用的要求。

1.55μm光波导放大器最新进展

文中对工作于1.55μm波段的光波导放大器的一些新的制作技术、材料、结构进行了综述。