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%.

Guiding properties of proton-implanted Nd^(3+)-doped phosphate glass waveguides

We report on the fabrication and properties of an optical waveguide in Nd^(3+)-doped phosphate glass.The planar waveguide was obtained by 550-ke V proton implantation with a dose of 8.0×10^(16)ions/cm^(2).The proton–glass interaction was simulated by the stopping and range of ions in matter(SRIM software).The characteristics of the waveguide including the refractive index profile and the near-field intensity distribution were studied by the reflectivity calculation method and the end-face coupling technique.The optical waveguide demonstrated multi-mode behavior at the wavelength of 632.8 nm.The propagation features of the proton-implanted Nd^(3+)-doped phosphate glass waveguide shows its potential to operate as an integrated photonic device.

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%.

The influence of cation additives on the NIR luminescence intensity of Er^(3+)-doped borate glasses

Er3+-doped 25BaO-(25-x)SiO2-xAl2O3-25B2O3 transparent glasses are prepared with x = 0,12.5 and 25 by a solid-state reaction.The Er-related NIR luminescence intensity,which corresponds to the transition of 4I15/2-4I13/2,is obviously altered with different silicon/aluminum ratios.The Judd-Ofelt parameters of the Er3+ ions are adopted to explain the intensity change in the NIR fluorescence,and the Raman scattering intensity versus the amount of Al and/or Si components are discussed.The spectra of the three samples are quite similar in the peak positions,but different in intensity.The maximal phonon density of state for the samples is calculated from the Raman spectra and is correlated to the NIR luminescence efficiency.

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.

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.

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.

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。

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.

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.

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%.

Nonlinear optical properties of Er_2O_3-doped 75Nb_2O_5-20TeO_2-5ZnO glasses

We have performed time-resolved degenerate four-wave mixing (DFWM) experiments in 75Nb2O5-20TeO2-5ZnO glasses doped by Er2O3 at different excitation intensities and lattice temperatures. DFWM signal exhibits three peaks at high excitation intensities, where a main peak appears at zero time delay and two rather weak side peaks locate symmetrically at the negative and positive time delay, respectively. The main peak is attributed to local-field effect and two side peaks are attributed to Coulomb interaction (CI).

(ZnO)_(1-x-y)(P_2O_5)_x(B_2O_3)_y玻璃的环境稳定性和红外光致发光(英文)

Er3+掺杂的(ZnO)1-x-y(P2O5)x(B2O3)y玻璃具有优良的光学性质。沸水煮沸实验结果表明,该类玻璃具有较高的环境稳定性。与(Er2O3)z(ZnO)1-x-z(P2O5)x-z类玻璃相比,Er3+掺杂的该类玻璃在1.5μm峰值位置的光谱半峰全宽超过110 nm,而且具有较高的猝灭浓度。

Yb^(3+),Er^(3+)离子共掺磷酸盐铒玻璃的Judd-Ofelt光谱参数与光谱性质

研究了含Er3 + 离子浓度较高 (1 5 5× 10 2 0 cm- 3 )的磷酸盐玻璃中Yb3 + 敏化离子浓度和Al2 O3 含量对Er3 + 离子光谱性质的影响 .根据掺Er3 + 磷酸盐玻璃的吸收光谱 ,利用Judd Ofelt理论计算了强度参数Ωt(t=2 ,4 ,6 ) 、Er3 + 离子的4 I13 2 →4 I15 2 能级跃迁振子强度、自发辐射几率等光谱参数 .用McCumber理论计算了Er3 + 离子的受激发射截面 ,结果表明Yb3 + 离子浓度不影响Er3 + 离子的受激发射截面 ,但会影响Er3 + 离子荧光强度 ,Yb3 + 含量越高 ,Er3 + 的荧光越强 .对掺Er3 + 磷酸盐玻璃的荧光上转换光谱测试表明 ,Yb3 + 含量越高 ,上转换荧光越强 。

Er^(3+)-Yb^(3+)共掺磷酸盐玻璃(LGS-L)波导放大器设计

就作者自行研制的Er3 + Yb3 + 共掺磷酸盐玻璃 (LGS L) ,用重叠积分方法进行放大器设计。在Er3 + 、Yb3 + 掺杂浓度分别为 1.5 1× 10 2 6ions/m3 、19.1× 10 2 6ions/m3 的情况下可获得 2 .6dB/cm的增益 ;Er3 + 掺杂浓度为2× 10 2 6ions/m3 时 ,在 4cm的器件上可获得超过 15dB的增益。此外 ,讨论了信号光和抽运光光场强度的横向分布与Er3 + 、Yb3 + 横向掺杂浓度分布之间的重叠对放大器增益的影响 ,放大器的最佳长度 ,以及在 980nm抽运下 ,Yb3 + 、Er3 + 掺杂浓度比对放大器增益的影响。

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抽运Er^(3+),Yb^(3+)共掺磷酸盐玻璃被动调Q激光器的理论分析和数值计算

研究了以Co^(2+)MgAl_2O_4晶体为饱和吸收体的LD抽运Er^(3+),Yb^(3+)共掺磷酸盐玻璃激光器.针对双掺离子之间的能量传递和Er^(3+)的多种跃迁过程,结合Co^(2+)MgAl_2O_4晶体中Co^(2+)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.

Cr^(3+),Yb^(3+),Er^(3+)共掺磷酸盐铒玻璃中Ce^(3+)和Cr^(3+)离子对光谱性质的影响

研究了 Cr3+ ,Yb3+ ,Er3+共掺磷酸盐铒玻璃的吸收光谱和荧光光谱性质。通过测定和计算各种 Cr3+ ,Yb3+ ,Er3+ 共掺磷酸盐铒玻璃的光谱参数 ,初步探明了 Ce3+ 和 Cr3+ 离子浓度含量对 Cr3+ ,Yb3+ ,Er3+ 共掺磷酸盐铒玻璃光谱性质的影响。结果表明 ,Ce O2 含量为 2 .8mol- %,Cr2 O3含量为 0 .0 8wt.- %玻璃的光谱性质较好。Ce3+ 离子价态的变化也对玻璃的光谱性质有重要影响。 Ce3+ 离子的存在更有利于对抽运光的吸收和能量的传递。在 Cr3+ ,Yb3+ ,Er3+共掺磷酸盐铒玻璃中实现了 Er3+荧光寿命达 8m s,受激发射截面为 0 .8× 1 0 - 2 0 cm2的光谱特性 ,为今后该玻璃的激光实验提供了重要参数。

上转换对Er^(3+),Yb^(3+)共掺磷酸盐玻璃激光器输出的影响

研究了激光二极管抽运的Er3+,Yb3+共掺磷酸盐玻璃激光器中共协上转换(cooperative upconversion)和累积能量转移(cumulative energytransfer)对激光输出的影响.通过对速率方程的数值模拟,定量计算并分析了共协上转换和累积能量转移对激光输出的影响,发现共协上转换对阈值抽运功率的影响可达到22%之多,实验结果和理论曲线相当符合.这有助于对Er3+,Yb3+共掺磷酸盐玻璃激光器进行优化.

Cr^(3+),Yb^(3+),Er^(3+)共掺磷酸盐铒玻璃转镜调Q激光性质研究

研究了Cr^(3+),Yb^(3+),Er^(3+)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QE7S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.