Low-Threshold High-Temperature Operation of ～7.4μm Quantum Cascade Lasers

We report low-threshold high-temperature operation of 7.4#m strain-compensated InGaAs/lnAIAs quantum cascade lasers （QCLs）. For an uncoated 22-μm-wide and 2-mm-long laser, the low-threshold current densities, i.e. 0.33kA/cm^2 at 81 K in pulsed mode and 0.64kA/cm^2 at 84K in cw mode, are realized. High-temperature operation of uncoated devices, with a high value of 223K, is achieved in cw mode.     

fficient Scheme for Implementing a Fredkin Gate via Resonant Interaction with Two-Mode Cavity Quantum Electrodynamics

A scheme for implementing a Fredkin gate with an atom sent through a microwave cavity is proposed. The scheme is based on the resonant atom-cavity interaction so that the gating time is sharply short, which is important in view of decoherence.     

Easy Fabrication of Dense Ceramic Membrane for Oxygen Separation

During the past decade, dense-type oxygen-permeable ceramic membranes have received considerable attention both in the fields of scientific research and industrial application1, 2. Such membranes have mixed oxygen-ionic and electronic conductivity, and they can permeate oxygen at high temperature under an oxygen gradient without the need of outside connecting line and electrodes. Envisioned applications range from small scale oxygen pumps for medical use to large scale integrated gasification …     

Synchronization in a Mutualism Ecosystem Induced by Noise Correlation

Understanding the cause of the synchronization of population evolution is an important issue for ecological improvement. Here we present a Lotka-Volterra-type model driven by two correlated environmental noises and show, via theoretical analysis and direct simulation, that noise correlation can induce a synchronization of the mutualists. The time series of mutual species exhibit a chaotic-like fluctuation, which is independent of the noise correlation, however, the chaotic fluctuation of mutual species ratio decreases with the noise correlation. A quantitative parameter defined for characterizing chaotic fluctuation provides a good approach to measure when the complete synchronization happens.     

HER磁镜装置中Hα测量及结果

本文描述HER磁镜中Ha面发光度时空分布的测量,发现等离子体发光,扰动,工作模式等呈环状结构;一个良好的热电子环可以抑制扰动环区的低频扰动。     

逆步李代数g(A)的导子代数

本文对逆步李代数g(A)的导子代数进行了研究.这里A是任意一个n×n阶的复矩阵,而g(A)是和其相关联的逆步李代数.特别地,当A是广义Caftan矩阵时, g(A)则为Kac-Moody代数.在这里,我们得到了g(A)的导子代数的结构.     

Thermal Lensing, Laser Performance at 1.06 μm and 0.53 μm of a NYAB Laser End pumped by a Diode laser array

1　Ｉｎｔｒｏｄｕｃｔｉｏｎ　　Ｓｅｌｆ ｆｒｅｑｕｅｎｃｙ ｄｏｕｂｌｉｎｇｌａｓｅｒｃｒｙｓｔａｌｓ,ｗｈｉｃｈｃｏｍｂｉｎｅｔｗｏｄｉｆｆｅｒｅｎｔｆｕｎｃｔｉｏｎｓｏｆｌａｓｅｒｅｍｉｓｓｉｏｎａｎｄｆｒｅｑｕｅｎｃｙｃｏｎｖｅｒｓｉｏｎ ,ｐｒｏｖｉｄｅａｓｉｍｐｌｅｗａｙｏｆｇｅｎｅｒａｔｉｎｇｃｏｈｅｒｅｎｔｖｉｓｉｂｌｅｒａｄｉａｔｉｏｎ .Ａｍｏｎｇｔｈｅｖａｒｉｏｕｓｓｅｌｆ ｆｒｅｑｕｅｎｃｙ ｄｏｕｂｌｉｎｇｃｒｙｓｔａｌｓ ,ｎｅｏｄｙｍｉｕｍｙｔｔｒｉｕｍａｌｕｍｉｎｕｍｂｏｒａ…     

一类新的极小谱任意符号模式

若给定任意一个$n$次首一实系数多项式$f(\lambda)$,都存在一个实矩阵$B\in Q(A)$, 使得$B$的特征多项式为$f(\lambda)$,则称$A$为谱任意符号模式. 如果一个谱任意符号模式的任意非零元被零取代后所得到的符号模式不是谱任意,那么这个谱任意符号模式称为极小谱任意符号模式.本文证明一类极小谱任意符号模式.     

光激电流谱的测试

用光激瞬态电流谱ＯＴＣＳ（ｏｐｉｔａｌｔｒａｎｓｉｔｉｏｎｃｕｎｅｎｔｓｐｅｃｔｒｏｓｃｏｐｙ）方法对ＩｎＰ∶Ｆｅ进行了初步测试。目的是研究半绝缘ＩｎＰ∶Ｆｅ中的深能级，了解其作为光电器件、高速器件衬底的稳定性。在低温下，用强光发现半绝缘ＩｎＰ∶Ｆｅ中存在两深能级，分别是ＥＴ＝０．３４ｅＶ的电子陷阱和ＥＴ＝１．１３ｅＶ的空穴陷阱。