高帧速自扫描光电二极管面阵

通过对多路并行输出的高帧速自扫描光电二极管面阵（ＳＳＰＡ）的研究，分析了影响面阵帧速和响应度的主要因素。设计并制作出３２×３２位多路并行输出的ＳＳＰＡ实验样品。其性能参数为：ＦＰＳ（帧速）≤２０００帧／秒时，Ｖｏｓ（最大输出电压）＝２４０ｍＶ，Ｒ（响应度）＝１．０９Ｖ·１ｘ－１·ｓ－１；ＦＰＳ＝１００００帧／秒时，Ｖｏｓ＝１５０ｍＶ；ＦＰＳ＝１５０００帧／秒时，Ｖｏｓ＝１００ｍＶ。     

音频平衡线路驱动器

在音频应用中往往需要把单端输入变换成平衡输出对。ＤＲＶ１３４和ＤＲＶ１３５就是为这种应用而设计的差分输出放大器。这种平衡音频驱动器由具有片上精密电阻器的高性能运放组成（见图１）。它们完全符合高性能音频应用,具有特别好的ａｃ特性,这包括低失真（在１ｋＨｚ为０．０００５％）和高转换速度（１５Ｖ／μｓ）。其片上电阻器是激光微调的,以保证精确的增益和最佳输出共摸抑制（ＯＣＭＲ）。宽输出电压摆幅（在６００上１７Ｖｒｍｓ）和高输出驱动能力使其适合广泛的应用需要（如音频差分线路驱动器、音频混合控制台,分配放大…     

ROHM公司CD／CDROM用集成电路一览表

ＲＯＨＭ公司ＣＤ／ＣＤＲＯＭ用集成电路一览表ＣＤ信号处理品名电源电压（Ｖ）功能特点封装ＢＡ６３７６Ｋ３．１～３．８ＲＦ·ＴＥ·ＦＥ生成、探伤、ＡＰＣ适应电压输出拾波、可在低电压下工作、内设自动聚焦ＱＦＰ３２ＢＡ６３７７Ｋ３．１～５．５ＲＦ·ＴＥ·Ｆ...     

1800MHz GaAs集成功率放大器

ＭＲＦＩＣ１８１７是Ｍｏｔｏｒｏｌａ公司的一 款３级集成功率放大器,是为用于蜂窝电话而设计的,它特别适用于ＤＣＳ１８００（ＰＣＮ）３．６Ｖ工作。通过调整匹配电路,它也适用于ＤＣＳ１９００（ＰＣＳ）设备。由于输入、输出和某些级间匹配是在芯片外实现的,所以器件可以调谐工作在１５００～２０００ＭＨｚ频率范围内的任何频率。典型性能（在不同电池电压下）如下： ·３３．５ｄＢｍ＠．３．６Ｖ · ３２．0ｄＢｍ＠３Ｖ 此性能使得ＭＲＦＩＣ１８１７适合于便携蜂窝应用,如： ·３Ｖ和３．６Ｖ ＤＣＳ１８００ ＣｌａｓｓＩ…     

SN—736无绳电话机故障检修实例

故障现象 分机与主机通话结束后,主机挂机失灵。 分析检修 参看图１,当分机与主机通话完毕,分机便发射关机导频信号使主机挂机,这时集成电路ＬＭ５６７９（Ａ）的第８脚输出低电平,经集成电路Ａ５（ＣＤ４００１）８、９脚输入,Ａ５的１０脚输出高电平并送入Ａ４的１脚,使Ａ４的３脚送出低电平,该低电平经Ｒ０１耦合使Ｖ７截止,Ｖ７集电极电位上升,由Ｒ３０耦合使Ｖ６基极电位上升,Ｖ６截止。从而切断送往发射系统前级的电源,使Ｖ１９～Ｖ２１失去电源而停止工作。检查Ａ５、Ａ４、Ａ７、Ａ６、Ｒ０１、Ｒ３０等元器件,发现晶…     

基于ABCD定律的LD-SMF高斯光束模式匹配方法的研究

在高斯场分布挖的前提下,根据矩阵光学理论和高斯光束转换的ＡＢＣＤ定律,从模式匹配的角度描述了半导体激光器（ＬＤ）与单模光纤（ＳＭＦ）之间的光耦合理论,提出了实现ＬＤ椭圆高斯光束与ＳＭＦ圆高斯光束间模式匹配的设计方法。这不仅对提高ＬＤ－ＳＭＦ的耦合效率有理论指导意义,而且也为其它场合下解决高斯光束的准直扩速及实现椭圆－圆高斯光转换等问题提供了有效依据。     

光束质量超过全固态激光器的千瓦直接半导体激光器

介绍了采用多波长耦合和偏振耦合的方式实现千瓦级高功率半导体激光输出的方法.通过光束整形的方法,实现了快慢轴光束参数积对称化,激光器输出激光光束质量小于12 mm·mrad,超过了全固态激光器的光束质量;激光器光-光转换效率达到87.5%.并通过智能化控制,实现了不同波长、不同功率、不同脉冲宽度的激光输出.     

部分端面抽运的Nd:YVO4板条固体激光器

利用自制高功率激光二极管（LD）列阵堆和波导整形抽运耦合系统，将抽运光耦合至Nd：YVO4板条晶体，平平腔运转得到了1.064μm的偏振激光输出。在最大抽运功率为84W时，透过率为10％的输出腔镜得到了31W的激光功率输出，光一光效率37％，斜效率45％，板条晶体两个方向的输出光束质量差别较大。为了进一步提高光束质量，使用柱面镜混合腔结构，在最大抽运功率为86W时，得到了19．3W的1064nm激光输出，测得的非稳腔和稳腔两个方向的M^2因子分别为1.4和1．7。     

利用3D Studio MAX为VRML建立虚拟现实世界

利用３ＤＳｔｕｄｉｏＭＡＸＲ２强大的三维建模和输出功能，可以将三维场景转化为ＶＲＭＬ２．０文件格式输出，从而为建造虚拟现实世界提供了极大的方便。文章详细讨论了利用３ＤＳｔｕｄｉｏＭＡＸ为ＶＲＭＬ建模并以ＶＲＭＬ２．０文件格式输出的问题。     

三明治腔结构的Nd:YVO_4激光器

报道了一种三明治腔结构（Ｓａｎｄｗｉｃｈ－ｔｙｐｅｒｅｓｏｎａｔｏｒ）的ＮｄＹＶＯ４全固态激光器。用发射波长８０６ｎｍ的光纤耦合二极管激光器（ＬＤ）泵浦ＮｄＹＶＯ４晶体，泵浦光功率为７Ｗ时获得１．０６４μｍ连续波（ＣＷ）ＴＥＭ００模最大输出功率为３．７Ｗ，光学斜效率为６２％；将ＫＴＰ放入腔内倍频，当泵光为５．６Ｗ时，获得ＣＷ绿光输出６２０ｍＷ。光－光转换效率达１１％。     

High power and high focusing CWCO2 laser using anunstable resonator with a phase-unifying output coupler

A high-power and high-focusing continuous-wave (CW) CO₂ laser with a novel unstable resonator was developed. This resonator contains a step-wise variable reflecting output coupler named the phase-unifying output coupler and a total reflector. The laser was excited by a capacitive-barriered AC discharge called a silent discharge. A linearly polarized laser beam with a diffraction-limited divergence angle of 0.55 mrad was obtained. Very stable CW laser operation at an output power of 5 kW was achieved with a threshold discharge power of 10 kW and a slope efficiency of 18%     

Research on Thermal Effect of Window of High Power Fast Axial Flow CO2 Laser

Because of the thermal effect of window of high power fast axial flow (CO2 laser, the coupler will be distorted and become a convex lens. In this paper, the thermal distorted coupler is taken as a quasi-lens ABCD system, and through experiment and theoretical analysis, relations between the position of the output beam waist, the beam waist size, divergence angle, and the output power are given.     

A 5 kW CW CO2 laser using a novel negative-branchunstable resonator with a phase-unifying output coupler

A 5 kW CW CO₂ laser using a negative-branch unstable resonator (M=-1.5) is proposed and characterized experimentally. The resonator consists of a stepwise variable reflecting output coupler, called the phase-unifying output coupler, and a total reflector. A 5 kW CW laser beam with diffraction limited quality (2&thetas;=0.45 mrad) is obtained and affected by the focal point in the resonator. The misalignment angle to reduce the laser power to 95% is improved by a factor of 19 compared with a positive-branch unstable resonator (M=1.5) with a phase-unifying output coupler at the same resonator length     

快速轴流CO_2激光器输出窗热透镜效应对输出特性的影响

根据ＡＢＣＤ定理,推出输出窗产生热透镜效应后束腰位置、光斑大小和发散角的变化,讨论了输出特性同输出功率的关系。     

4 W single-transverse mode VECSEL utilising intra-cavity diamond heat spreader

An optically pumped semiconductor vertical external cavity surface emitting laser, with high output power and excellent beam quality operating at a wavelength near 1.05 /spl mu/m, is reported. A transparent diamond heat spreader was used for thermal management of the laser. The gain structure grown by molecular beam epitaxy includes 13 compressively strained InGaAs quantum wells. Maximum output power of 4 W with diffraction-limited beam (M/sup 2//spl les/1.15) was achieved using a 2% output coupler and incident pump power of 20 W. It is shown that power scalability is feasible with the presented laser geometry.     

1D VRM非轴对称虚共焦腔(Nd，Ce)：YAG板条激光器的实验研究

对(Nd,Ce):YAG板条固体激光器提出了一维变反射率镜(1D VRM)非轴对称虚共焦腔,并与平行平面腔和旋转对称变反射率镜(2D VRM)虚共焦腔等腔型作了实验比较研究。结果表明,1D VRM虚共焦腔适音板条固体激光器, 兼顾输出激光效率和光束质量。     

High-power fiber laser combination technology

Research on fiber laser combination is discussed briefly in this paper.High-power double clad-fiber laser beam combination technology is introduced and different kinds of fiber laser beam combination and coherent combination technologies are evaluated.Tapered fused bundle (TFB) couplers are used in laser combine for higher power.In this paper, the theory and progress in TFB coupling are introduced.The experiment on our selffabricated TFB is presented.The efficiency of the fiber coupler exceeded 70% and increased as the input power went up.A maximum total output power of 689 W was obtained, with an efficiency of 74%.The fiber coupler displayed stability during the course of the experiment,without any cooling provided.     

Surface-emitting multiple quantum well distributed feedback laserwith a broad-area grating coupler

A surface-emitting laser diode with a 100×200 μm² grating coupler was fabricated. Narrow beam divergence angles of 2°×0.32° and a maximum output power of 210 mW were obtained     

干涉法测量激光器输出镜片的光学参数

本文描述一种测量ＣＯ２激光器耦合镜中光程随温度变化的方法,用一束探测光穿过具有两平行表面的镜片,测量了镜片温度变化时,通过镜片的激光功率变化,导出了有关耦合镜状态的分析表达式。然后讨论了镜片分别通过１．５ｋＷ和２．０ｋＷ激光功率时的情况,其结果与实验数据符合甚好。     

A variable reflectivity output coupler for optically pumped far infrared lasers

In this paper we describe the design and performance of a variable reflectivity output coupler for optically pumped far infrared (FIR) lasers. The output coupler is a compact, tunable Michelson interferometer. The output coupling ratio (i.e. the Michelson transmission) is adjustable between 0 and ≥60% for laser line wavelengths between 110 and 500 μm. This output coupler provides increased output power and flexibility, since it can be tuned to optimum coupling ratio for different laser lines. Beam profile measurements show that the Michelson output coupler produces a well collimated Gaussian laser beam. Design features are a) the use of 10 μm reflection coated quartz vacuum window which acts as a dichroic mirror for the pump radiation and b) the high mechanical stability obtained by a leaf spring flexure mount of the movable Michelson mirror and by restricted alignment devices.