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1.
本文在传统的掩埋新月型激光器的基础上,提出了一种1.3μmInGaAsP/InP大功率激光器结构-选择性质子轰击掩埋新月型激光器(SPB-BC).文中对其制作过程及特性进行了详细的描述和测量.它的最低阈值电流小于10mA,对于n-InP衬底,它的最大输出功率为65mW,p-InP衬底,最大输出功率为80mW.在重复频率为2.1GHz时,测得光脉冲的半宽度(FWHM)为18ps.  相似文献   

2.
1.3μm InGaAsP/InP大功率短脉冲SPB-BC激光器   总被引:1,自引:0,他引:1  
本文在传统的掩埋新月型激光器的基础上,提出了一种1.3μmInGaAsP/InP大功率激光器结构-选择性质子轰击掩埋新月型激光器(SPB-BC).文中对其制作过程及特性进行了详细的描述和测量.它的最低阈值电流小于10mA,对于n-InP衬底,它的最大输出功率为65mW,p-InP衬底,最大输出功率为80mW.在重复频率为2.1GHz时,测得光脉冲的半宽度(FWHM)为18ps.  相似文献   

3.
介绍了一个1.55μm光纤孤子激光器及利用它作源的光孤子脉冲传输实验。其中采用了掺铒光纤放大器锁模技术.实测孤子激光器输出脉冲宽度为30ps.谱宽为0.16nm;经过50km色散位移光纤传输后,其脉宽与谱宽基本维持不变.  相似文献   

4.
GaAs微微秒光导开关的研究   总被引:1,自引:0,他引:1  
采用离子注入高纯LECGaAs材料,设计研制了共面线和微带线两种结构微微秒(ps)光导开关.其输出电脉冲响应时INFWHM为8—10ps,当光强为1mW时,电脉冲幅度为0.2V  相似文献   

5.
南京电子器件研究所研制成功工作频率3.1~3.4GHz,脉冲宽度300μs,占空比10%,输出功率大于50W,功率增益大于7dB,效率大于40%的硅脉冲功率晶体管。该器件在脉冲宽度为100μs时输出功率大于60W。器件的输出功率、增益和效率等特性所能达到的水平是工作频率的敏感函数。随着工作频率的提高,器件的高频功率优值(Po·Ro)下降,微波寄生参量变得非常突出,信号损耗增大,造成器件的输出功率、增益和效率的大幅度下降。因少子迁移率的限制,硅功率器件一般工作于S波段以下。限制器件功率输出的另一重…  相似文献   

6.
采用离子注入高纯LEC GaAs材料,设计研制了共面线和微带线两种结构微微秒(ps)光导开关。其输出电脉冲响应时间FWHM为8-10ps,当光强为1mW时,电脉冲幅度为0.2V。  相似文献   

7.
研制了雪崩二极管脉冲成形电路,简述了此电路的工作原理,用此线路产生了幅度2.8kV,宽度140p的高压电脉冲。  相似文献   

8.
本文叙述Q突变激光器输出脉冲的改进了的整形系统。采用这个系统,已经产生半峰值宽度小于250微微秒的光脉冲。由于采用了附加光路,使最初的Q开关和最终成形脉冲之间的峰值强度只有较小程度的降低。激光触发火花隙被用作产生上升时间小于180微微秒的控制电脉冲。本文叙述光孔径为5毫米和电上升时间为74微微秒的普克尔盒的设计。  相似文献   

9.
报道了用1064nm激光脉冲触发半绝缘GaAs光电导开关的一种奇特光电导现象.GaAs光电导开关的电极间隙为4mm,当偏置电场分别为2.0和6.0kV/cm时,用脉冲能量为0.8mJ,宽度为5ns的激光触发开关,观察到开关输出的线性和非线性工作模式.当偏置电场增至9.5kV/cm,触发光脉冲能量在0.5~1.0mJ范围时,观察到奇特的光电导现象,开关先输出一个线性电脉冲,经过大约20~250ns时间延迟后,触发光脉冲消失,开关又输出一个非线性电脉冲.这一奇特光电导现象的物理机制与半绝缘GaAs中的反位缺陷和吸收机制有关.分析计算了线性与非线性电脉冲之间的延迟时间,结果与实验观察基本吻合.  相似文献   

10.
本文报道了外腔面发射InGaAs/InP半导体激光器的实验结果.利用面发射InGaAs/InP半导体材料作为激活介质,采用锁模(或连续)Nd+3:YAG激光(波长1.32μm)泵浦.平均输出功率达187mW,同步泵浦获得最窄脉冲宽度为6ps,输出波长1.5μm,利用衍射光栅对脉冲进行压缩获得181fs超短光脉冲.  相似文献   

11.
DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system.  相似文献   

12.
This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel's.  相似文献   

13.
The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.  相似文献   

14.
Today, micro-system technology and the development of new MEMS (Micro-Electro-Mechanical Systems) are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.  相似文献   

15.
The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.  相似文献   

16.
From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.  相似文献   

17.
Waveguide multilayer optical card (WMOC) is a novel storage device of three-dimensional optical information. An advanced readout system fitting for the WMOC is introduced in this paper. The hardware mainly consists of the light source for reading, WMOC, motorized stages addressing unit, microscope imaging unit, CCD detecting unit and PC controlling & processing unit. The movement of the precision motorized stage is controlled by the computer through Visual Basic (VB) language in software. A control panel is also designed to get the layer address and the page address through which the position of the motorized stages can be changed. The WMOC readout system is easy to manage and the readout result is directly displayed on computer monitor.  相似文献   

18.
It is well known that adding more antennas at the transmitter or at the receiver may offer larger channel capacity in the multiple-input multiple-output(MIMO) communication systems. In this letter, a simple proof is presented for the fact that the channel capacity increases with an increase in the number of receiving antennas. The proof is based on the famous capacity formula of Foschini and Gans with matrix theory.  相似文献   

19.
In order to diagnose the laser-produced plasmas, a focusing curved crystal spectrometer has been developed for measuring the X-ray lines radiated from a laser-produced plasmas. The design is based on the fact that the ray emitted from a source located at one focus of an ellipse will converge on the other focus by the reflection of the elliptical surface. The focal length and the eccentricity of the ellipse are 1350 mm and 0.9586, respectively. The spectrometer can be used to measure the X- ray lines in the wavelength range of 0.2-0.37 nm, and a LiF crystal (200) (2d = 0.4027 nm) is used as dispersive element covering Bragg angle from 30° to 67.5°. The spectrometer was tested on Shengnang- Ⅱ which can deliver laser energy of 60-80 J/pulse and the laser wavelength is 0.35 μm. Photographs of spectra including the 1 s2p ^1P1-1s^2 ^1S0 resonance line(w), the 1s2p ^3P2-1s^2 1S0 magnetic quadrupole line(x), the 1s2p ^3P1-1 s^2 ^1S0 intercombination lines(y), the 1 s2p ^3S~1-1 s^2 ^1S0 forbidden line(z) in helium-like Ti Ⅹ Ⅺ and the 1 s2s2p ^2P3/2-1 s622s ^2S1/2 line(q) in lithium-like Ti Ⅹ Ⅹhave been recorded with a X-ray CCD camera. The experimental result shows that the wavelength resolution(λ/△ 2) is above 1000 and the elliptical crystal spectrometer is suitable for X-ray spectroscopy.  相似文献   

20.
High purity organic-tantalum precursors for thin film ALD TaN were synthesized and characterized.Vapor pressure and thermal stability of these precursors were studied.From the vapor pressure analysis,it was found that TBTEMT has a higher vapor pressure than any other published liquid TaN precursor,including TBTDET,TAITMATA,and IPTDET.Thermal stability of the alkyl groups on the precursors was investigated using a 1H NMR technique.The results indicated that the tertbutylimino group is the most stable group on TBTDET and TBTEMT as compared to the dialkylamido groups.Thermal stability of TaN precursors decreased in the following order:TBTDET > PDMAT > TBTEMT.In conclusion,precursor vapor pressure and thermal stability were tuned by making slight variations in the ligand sphere around the metal center.  相似文献   

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