小尺寸氮化镓基蓝、绿色发光二极管管芯的制作方法

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波长可调谐分布布拉格反射半导体激光器的制作方法

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单模微腔半导体激光器

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垂直腔面发射激光器的光收发一体模块

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垂直腔面发射激光器列阵的并行光发射模块及制作方法

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提高n型硅原位掺杂载流子浓度的方法

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氮化镓基发光二极管管芯的制作方法

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氮化镓基发光二极管N型层欧姆接触电极的制作方法

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具有平顶和陡边响应的半导体光电探测器及实现方法

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Investigation of spectral bandwidth of optical parametric amplification

The spectral bandwidth of three-wave-mixing optical parametric amplification has been investigated. A general mathematical model for evaluating the spectral bandwidth of optical parametric amplification is developed with parametric bandwidth and gain bandwidth via three-wave noncollinear interactions. The spectral bandwidth is determined by expanding the wave-vector mismatch in a Taylor series and retaining terms through second order. The model takes into account the effects of crystal length, noncollinear angle, group velocity, group-velocity dispersion and gain coefficient. The relation between parametric bandwidth and gain bandwidth is clearly defined. The model is applied to a BBO OPA, a LBO OPA and a CLBO OPA.

Characteristics of beam profile of Gaussian beam passing through an axicon

Bessel beam can overcome the limitation of the Rayleigh range of Gaussian beam with the same spot size propagation without any spreading due to diffraction, which is considered as an useful function in guiding particles in the next generation of optical tweezers. The mathematical description of the Bessel beam generated by an axicon is usually based on the Fresnel diffraction integral theory. In this paper, we deduce another type of analytic expression suitable for describing the beam profile generated from the axicon illuminated by the Gaussian beam based on the interferential theory. Compared with the Fresnel diffraction integral theory, this theory does not use much approximation in the process of mathematical analysis. According to the derived expression, the beam intensity profiles at any positions behind the axicon can be calculated not just restricted inside the cross region as the Fresnel diffraction integral theory gives. The experiments prove that the theoretical results fit the experimental results very well. (C) 2004 Elsevier B.V. All rights reserved.

蒙特卡洛法在HIRFL-CSR钛升华泵设计中的应用

介绍了用蒙特卡洛法计算HIRFL CSR钛升华泵对于不同气体吸附系数在分子流条件下的吸附概率,并分析了挡板的形状、位置设置对于吸附概率的影响。通过实验测试,发现HIRFL CSR钛升华泵对H2的抽速与计算值接近,证明用蒙特卡洛法模拟计算、设计钛升华泵是可行的。

核物质中K介子有效质量与非线性效应

分析了核物质标量密度和矢量密度对K介子有效质量的影响.使用非线性σ ω ρ模型和相对论平均场理论,给出了核物质标量密度和矢量密度的近似关系曲线,并与线性σ ω模型的情况进行了比较.利用这一关系,改进了K介子有效质量和核物质密度之间存在的依赖关系,比较不同模型对K介子有效质量的影响.同时也计算了纯中子物质中K介子在不同模型下的有效质量曲线,并与在对称核物质中的情况进行了比较.

非束缚核~9He的实验研究

简要介绍了目前有关非稳定核9He的实验和理论研究现状.现代壳模型理论计算表明9He的基态自旋宇称为1/2+,而不是1/2-,即存在自旋宇称翻转现象.到目前为止,实验上虽然观测到了9He的几个共振态,但还不能确认其基态的能量和自旋宇称值.利用新的实验技术———逆运动学弹性共振散射,对9He核进行研究,给出了共振态的自旋宇称可能的取值范围.在ISOL型次级束装置上的实验有望能给出9He核能级的精确测量.

对超重核基态性质的系统性研究

对有限力程小液滴模型计算的质子数Z=101—130超重核同位素链核的基态性质进行了系统的分析,通过对这些同位素链中处于裂变稳定线上核的平均结合能、四极形变、单质子分离能、双质子分离能和α衰变能等性质的系统研究,显示了质子数Z=108,114,126和中子数N=162,180,196时壳幻数的存在,同时可以看到Z=127之后超重核的基态性质还需要进一步研究.