𝒬-switched neodymium-doped phosphate glass fiber lasers

The operation of a short-pulse, 𝒬-switched, neodymium-doped fiber laser operating at 1.054 μm is described experimentally and theoretically. The laser is efficiently pumped with a single-stripe AlGaAs laser diode and emits >1 kW pulses. It is seen that due to high gain short pulses with high energy extraction efficiency can be obtained. The feature of broad emission lines associated with rare-earth-doped glasses is exploited to demonstrate tunable, 𝒬-switched operation over a 40-nm tuning range     

Er3+/Yb3+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.     

光纤制备中的外汽相沉积工艺研究

人们对光纤生产过程中外汽相沉积(OVD)工艺的沉积机理的研究已经有好多年，但实际生产过程中，很多因素都会影响沉积速率和效率。为此我们通过试验，研究了决定沉积速率和沉积效率的主要因素，如预制棒表面温度、SiCl4流量和SiO2颗粒的温度等。     

一种新型的光纤光栅制作方法

本文提出了一种新的光纤光栅制作方法－莫尔条纹振幅模板写入法。这种方法是采用莫尔条纹构成模板实现对写入光强的振幅调制,在硫化物光纤中写入周期为365nm的长周期光栅。这一方法可大大简化模板的制作工艺和降低成本,是一种使用方便、性能价格比优的方法。     

Laser cleaving of glass fibers and glass fiber arrays

An ultraviolet (UV)-excimer-laser-based cleaving procedure for silica fiber has been developed that enables automated cleaving for high-volume production of fiber-optic assemblies. A selective ablation of the glass in the form of a small rectangular cavity serves as a fracture initiator when the fiber is put under stress. The position of the UV-excimer-laser-induced scratch is very precise. The system provides high-quality cleaves on single-fiber and ribbon configurations. The end angle of the cleaved optical fiber is measured using a noncontact optical interferometer system and was 0.85/spl deg/ for perpendicular cleavages. Insertion loss after splicing is in the range of 0.03 dB, which is compatible with mechanical-cleaved fibers.     

高效率掺钕磷酸盐玻璃激光器

报道了一种高效率的磷酸盐玻璃激光器,用(?)6×100mm的磷酸盐玻璃棒获得2.6%的激光效率.     

聚合物光纤光栅制备进展

聚合物光纤光栅不仅具有体积小、质量轻、柔软、成本低等诸多优点，还因聚合物自身的特性而具有灵敏度高、响应范围宽、生物兼容性等优良特性。首先梳理了聚合物光纤的光敏性机理，概述了聚合物光纤光栅制备的刻蚀光源和方法；其次根据聚合物光纤的组成材料，概述了多种聚合物光纤光栅的制备进展和性能指标，包括聚甲基丙烯酸甲酯、环烯烃共聚物TOPAS、透明无定物氟聚合物CYTOP和聚碳酸酯。总之，目前聚甲基丙烯酸甲酯聚合物光纤光栅的研究占主导，而基于新型材料的聚合物光纤光栅因自身独特的优势也逐渐受到重视。     

超大模场双包层光纤的制备与性能测试

阐述了大模面积有源光纤的基本原理,介绍了有源光纤的制备过程。针对目前国内大模场有源光纤制备技术中存在的问题,从传统结构大模面积光纤的制备工艺入手,对有源光纤预制棒制备工艺进行了理论分析和实验优化,通过采用多次沉积等新技术,解决了有源区面积难以增大等问题。最终制备出纤芯直径95 μm的传统结构的超大模场有源光纤,并实现了激光输出。     

Reproducible fabrication method for polarization preservingsingle-mode fiber couplers

The adaptation of the biconically-tapered-fused (BTF) fiber coupler fabrication approach to polarization preserving fiber couplers is reported. Two practical methods for identifying and aligning the birefringent axes of the fibers forming the coupler are described. The fabrication approaches are highly reproducible and the 3-dB couplers fabricated exhibit less than 1.0-dB insertion loss, controllable splitting ratio, and an average polarization extinction ratio of 15 to 20 dB     

长周期光纤光栅的制作技术

由于具有一些独特的特性 ,长周期光纤光栅在光纤通信和传感系统中有许多的重要应用。长周期光纤光栅的低成本高效率制作是其广泛应用的先决条件。简要概述了长周期光纤光栅制作技术的最新进展。     

Full characterization of packaged Er-Yb-codoped phosphate glass waveguides

We present a procedure for the characterization of packaged Er-Yb-codoped phosphate glass waveguides. The procedure is based on precise measurements of the output optical powers when the waveguide is diode-laser pumped at 980 nm. The dependence of these optical powers on the input pump power is then fitted to the results from a numerical model that describes in detail the propagation of the optical powers inside the waveguide. The best fit is obtained for the following parameters: the signal wavelength scattering losses are /spl alpha/(1534)=8.3/spl times/10/sup -2/ dB/cm, the Yb/sup 3+/ absorption and emission cross sections (/spl ap/980 nm) are 5.4/spl times/10/sup -25/ m/sup 2/ and 7.0/spl times/10/sup -25/ m/sup 2/, the Er/sup 3+/ absorption and emission cross sections (/spl ap/980 nm) are 1.6/spl times/10/sup -25/ m/sup 2/ and 1.2/spl times/10/sup -25/ m/sup 2/, the Yb/sup 3+/--Er/sup 3+/ energy-transfer coefficient is 1.8/spl times/10/sup -23/ m/sup 3//s and the cooperative-upconversion coefficient is 8/spl times/10/sup -25/ m/sup 3//s. An approximate method is introduced that allows the determination of the absorption and emission cross section distributions for the erbium /sup 4/I/sub 13/2//spl hArr//sup 4/I/sub 15/2/ transition from the amplified spontaneous emission power spectrum.     

啁啾光纤光栅的制备研究进展

对连续啁啾光纤光栅和阶跃啾光纤光栅的制备研究情况做了概述,并对各种制备方法的特点进行了简要分析。     

Polarization properties of the flint glass fiber

To realize stable characteristics of a current sensor using the Faraday effect in an optical fiber, it is necessary to prevent the influence of birefringent effect on light passing the fiber, which is caused by photo-elastic effect and/or lack of axial symmetry of its structure. The flint glass fiber manufactured from flint glass with very small photo-elastic constant, which has circular core and satisfies the single ode condition,has been developed to solve this problem. This paper reports results of a study to clarify polarization properties of the fiber and to consider a method for highly stabilizing the polarization. From experiments to investigate the relationship between state of polarization of light inserted to the fiber and that emitted from another end, it was confirmed that the birefringence due to the photo-elastic effect and the lack of symmetry are negligibly small. It also became known that the azimuth angle of polarization of the emitted light depends on the shape of the curve of the fiber. Namely, a rotation of the polarization plane is equal to the amount of line integral of the torsional rate along the curve. A countermeasure is necessary for this phenomenon, because characteristics of the current sensor may be influenced if the flint glass fiber coil is deformed by environmental factors. From a consideration of the mechanism of the phenomenon, it is inferred that the problem can be solved by reciprocating light in the fiber to stabilize the polarization. The effect of this method is confirmed experimentally     

微结构光纤制备中的问题分析

分析了微结构光纤制备过程中存在的一些问题,简述了温度、空气孔中的空气压力、表面张力等因素对微结构光纤中毛细管形变的影响.建立了可行的制备技术工艺路线.同时比较了微结构光纤预制棒制作的不同方法,详细介绍了改进的堆积法方案.     

新型高掺铥硅酸盐玻璃光纤及其光纤激光的研究

具有高稀土离子掺杂浓度的有源光纤一直以来是高性能单频光纤激光器的核心,选用硅酸盐玻璃材料制作高掺杂有源光纤可以有效提升光纤增益。通过高温熔融工艺制备了铥离子掺杂浓度为8 wt.%的高掺杂硅酸盐玻璃,测试了其光谱特性和荧光寿命,并根据McCumber理论计算玻璃的受激发射截面。采用管棒法制备光纤预制棒,拉制出尺寸为7/125 μm的高掺铥硅酸盐玻璃光纤。基于低损耗的异质光纤熔接,测试了该光纤的增益特性,并分别采用2 cm和8 cm的新型掺铥光纤搭建线形腔光纤激光器,获得百毫瓦的1950 nm激光输出。研究表明,在8 wt.%的高浓度掺杂下,铥离子在文中的新型硅酸盐光纤基质中具备良好的发光能力,这种国产高掺杂玻璃光纤在实现高性能单频光纤激光器方面具有明显优势。     

离子交换增强的磷酸盐激光玻璃

研制了抗盐浴能力较强,光谱与激光特性良好的新型磷酸盐激光玻璃。采用表面离子交换增强处理,大幅度提高了上述玻璃的抗热冲击性能。     

聚焦离子束在光纤探针制备技术中的应用

本文概述了利用聚焦离子束制备用于近场光学显微镜光纤探针的方法,讨论了探针的锥型刻蚀、孔径控制和特殊结构加工等;论述了聚焦离子束的工作原理和在光纤探针高精度加工方面的优势。利用此技术制备的光纤探针的锥型和针尖孔径精确可控,并具有高光洁度,高通光效率等特点。     

Analysis of planar optical waveguide fabrication by ion exchange in glass

Fabrication of planar optical waveguides by silver-ion exchange in glass, and the resulting refractive index profiles related to the fabrication conditions, are investigated. The second-order polynomial profile model proposed by Stewart et al. [3] is confirmed, and the dependence of the model characteristics on fabrication conditions is analyzed. Use of the resulting relationships is demonstrated by the compilation of a design table of expected waveguide mode structures for given fabrication conditions. Methods of exchanged-ion concentration profile determination are reviewed and a simple method based on sample angle lapping is proposed.     

玻璃光纤中的瞬态受激喇曼散射

用峰功率大于10~7瓦的0.53微米微微秒光脉冲序列激发一根20米长的锗磷硅玻璃光纤,观测到稳定的15级以上斯托克斯和8级以上反斯托克斯散射。喇曼频移为430厘米~(-1)。散射光频谱范围为0.45～1.00微米。受激喇曼散射的转换效率大于50％。     

200毫米的磷酸盐钕玻璃片状放大器

报导了200毫米的高功率磷酸盐钕玻璃片状放大器的研究工作。给出了放大器的增益系数与光泵能量的关系,并着重讨论了寄生振荡对提高片状放大器储能的影响。实验表明,在消除寄生振荡的情况下,片状放大器所达到的增益系数与理论预期的结果一致。 一台片状放大器,由三片200×400×40(毫米)的磷酸盐钕玻璃片按布氏角安放所组成,净通光口径为200毫米。周围有30支非均匀分布的氙灯,外径为17毫米,弧长1200毫米,总输入能量为36万焦耳。采用了引燃管内触发多灯点燃系统,解决了三十支氙灯在高电压下同时点燃的技术问题。