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GaAlAs/GaAs量子阱结构的实验研究 总被引:1,自引:0,他引:1
利用分子束外延生长法生长出了GaAlAs/GaAs梯度折射率分别限制单量子阱结构材料,对样品进行了光荧光谱、双晶X射线衍射和电化学电容-电压分布测量。实验结果表明,样品质量达到了设计要求,利用该材料制作的激光二极管获得了初步结果。 相似文献
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GaAs中的离子注入技术 总被引:1,自引:0,他引:1
在GaAs集成电路和器件研制中,离子注入是关键技术之一.介绍了用离子注入GaAs形成n型和p型区,以及离子注入p型和n型GaAs形成绝缘层、形成n+GaAs深埋层等重要技术.对有关物理机制进行了讨论并提出了一些新见解;该离子注入新工艺已经应用于GaAs器件和集成电路的研制,获得了多种新型器件. Optical and electrical properties of Si GaAs wafers implanted with Si+, S+, Be+, Mg+, B+, O+ have been investigated in this paper. 相似文献
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GaAs被动调QMd:激光器激光行性的研究 总被引:1,自引:0,他引:1
报道了用半导体材料GaAs实现氙灯抽运Md:YAG激光器的被动调Q运转,测量了激光器的阀值、脉冲宽度和输出能量。从GaAs的能级结构出发,理论上研究了GaAs材料的饱和吸收原理,建立了调Q激光器速率方程并给出了数值解,对理论结果与实验结果进行了比较和讨论。 相似文献
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GaAs/GaAlAs定向耦合器型行波调制器:1.设计 总被引:1,自引:0,他引:1
从理论上重点分析和研究了器件行波电极的微波特性,在半绝缘GaAs衬底上设计了具有n^+重掺杂外延层和共平面电极的GaAs/GaAlAs定向耦合器型行波调制器,针对实验中发现的行波电极上微波的高传输损耗问题。分析了起因并提出了器件的改进设计方案,从而设计出可达到35GHz带宽的高速调制效应的光波导调制器。 相似文献
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在理论分析设计的基础上,进行了GaAs/GaAlAs定向耦合器型波调制器试验,建立了器件行波电极微波特性的测试系统,由此系统进行实验确定器件最佳结构参数,完成器件的制作,器件采用共平面波电极,击穿电压28V。用1.06μmYAG激光器进行测试,开关电压8.5V。由微波网络分析仪测试器件行波电极的微波特性,测得电极中微波与波导中光波间的速率失配小于3%,且在30GHz下,微波传输损耗小于30dB表明 相似文献
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GaAs非对称X结波导混合耦合器的研究 总被引:2,自引:1,他引:1
本文报道了GaAs非对称X结波导耦合器的工作原理。该器件制作在n^-/n^+GaAs外延材料上。文中采用有效折射率法分析了这个耦合器的分离角、波导脊高及其两个非对称波导传播常数差之间的关系。器件在λ=1.15μm下测量,得到了小于-2.9dB的分光性能和小于-20dB的串音比。 相似文献
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研究了超短光脉冲在GaAs表面激发相干亚毫米波振幅随入射角变化的规律,前后向辐射比值随入射角度变化的规律,实验测量了GaAs表面镀上极薄金属薄膜后产生的相干亚毫米波振幅对薄膜厚度的依赖关系,利用光生载子偶极辐射的理论模型成功地解释了实验得到的角度依赖关系和相干亚毫米波的偏振特性。 相似文献
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I. P. Yudin I. G. Voloshina E. E. Perepelkin N. S. Rossiyskaya 《Physics of Particles and Nuclei Letters》2007,4(4):367-376
Numerical modeling of the field distribution of the spectrometric magnet 1SP-40-4V with a gap of 0.68 m for the experiment NIS (Nucleon Intrinsic Strangeness) (building 205, LHE JINR) is carried out. Mathematical formulation of the direct magnetostatic problem is presented. Numerical procedures and algorithms of field calculation using two scalar potentials are described. Detailed results of the calculation of the setup magnet’s field are given. A comparison with available experimental data is presented. Obtained results are used for computer modeling of the setup and experiment and will be used for data processing after collection of physical data. 相似文献
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WU Di LI Mingxuan WANG Xiaomin CHENG Yue 《声学学报:英文版》2007,26(1):85-96
The field of horizontally polarized ultrasonic shear wave radiated by a 2/2 piezoelectric composite normal probe was studied. The strictly analytic field solutions for two different surface forces were deduced and the field distribution and directivity patterns were given by numerical calculations. The vertical radiated field of shear wave was obtained theoretically and compared with experiment. The experimental result of directivity pattern conformed the theoretical prediction, which provided the theoretical basis for the engineering application of the transducer. 相似文献
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In this paper,we investigate the photoionization microscopy of the Rydberg hydrogen atom in a gradient electric field for the first time.The observed oscillatory patterns in the photoionization microscopy are explained within the framework of the semiclassical theory,which can be considered as a manifestation of interference between various electron trajectories arriving at a given point on the detector plane.In contrast with the photoionization microscopy in the uniform electric field,the trajectories of the ionized electron in the gradient electric field will become chaotic.An infinite set of different electron trajectories can arrive at a given point on the detector plane,which makes the interference pattern of the electron probability density distribution extremely complicated.Our calculation results suggest that the oscillatory pattern in the electron probability density distribution depends sensitively on the electric field gradient,the scaled energy and the position of the detector plane.Through our research,we predict that the interference pattern in the electron probability density distribution can be observed in an actual photoionization microscopy experiment once the external electric field strength and the position of the electron detector plane are reasonable.This study provides some references for the future experimental research on the photoionization microscopy of the Rydberg atom in the non-uniform external fields. 相似文献
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A. A. Baldin I. G. Voloshina E. E. Perepelkin R. V. Polyakova N. S. Rossiyskaya T. V. Shavrina I. P. Yudin 《Technical Physics》2007,52(11):1397-1406
In terms of the magnetostatic problem in the differential statement, a mathematical simulation of the 3D distribution of the magnetic field generated by the SP-40 magnet of the MARUSYA experimental setup (Laboratory of High Energies, Joint Institute for Nuclear Research, Dubna) is carried out. The mathematical statement of the direct magnetostatic problem is given. Computational procedures and field calculation algorithms with one vector and two scalar potentials are described. The simulated magnetic field distribution is compared with experimental data for the field of the modified SP-40 magnet with a pole spacing of 0.207 m. The results of this work are used in experimental data processing and are also helpful in simulation of magnetooptic systems. 相似文献
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A. A. Baldin E. E. Perepelkin V. L. Smirnov I. P. Yudin 《Physics of Particles and Nuclei Letters》2010,7(1):51-56
In the framework of the differential formulation of the magnetostatical problem, mathematical modeling of the three-dimensional
distribution of magnetic field for the SP-57 magnet of the experimental setup MARUSYA (Laboratory of High Energies Physics,
Joint Institute for Nuclear Research) is made. Mathematical formulation of the direct magnetostatical problem is given. Numerical
procedures and algorithms for calculation of the field using two scalar potentials are described. The results of modeling
and comparison of the calculated distribution of the magnetic field with measured data for the field of the SP-57 magnet with
a gap of 0.10 m between the poles are presented. The obtained results are used for processing experimental data and modeling
magneto-optical systems. 相似文献
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光纤耦合LD输出光场特性研究 总被引:1,自引:0,他引:1
根据光纤传输的模式理论,分析了单芯光纤输出端面的光场分布.利用单模光纤测量了纤端光场的强度分布,拟合了光纤输出端面光强分布的近似表达式.根据此数值计算和实验测量了多芯光纤输出端面的强度分布,结果基本吻合.表明光纤出射端面的光强分布应是介于高斯分布和几何分布之间的一种准高斯分布. 相似文献
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使用连续式输出的砷化镓半导体激光器泵浦的掺钕钒酸钇激光器作为光源,利用磷酸氧钛钾晶体腔内倍频产生波长为532nm的绿光,通过轴棱锥产生了近似无衍射贝塞尔光束。推导了倍频产生的绿光的场分布,并模拟了倍频绿光经过轴棱锥产生的近似无衍射光束的轴向光强分布图和截面光强分布图。通过实验拍摄了距离轴棱锥不同位置的截面光强分布,测量了无衍射贝塞尔绿光的最大无衍射距离和中心光斑直径,实验数据与理论模拟基本吻合。实验结果说明所述方法产生的倍频无衍射绿光具有良好的光束质量,具有应用价值。 相似文献