Abstract:评论了Ⅱ-Ⅵ族半导体HgCdTe的化学束-气源外延生长系统的设计和研制,介绍了生长HgCdTe外延层和气体源掺碘CdTe外延层的最新结果,这些结果表明了用这种技术生长用于制备先进红外探测器的优质材料的可能性.

Abstract:Hg_(1-x)Cd_xTe ion-implanted N~+-P gate-controlled photodiodes are fabricated.Measurements show that the P-N junction characteristics are limited seriously by surface channel leakage current due to strong inversion of P-side surface. A theoretical analysis about this leakage mechanism is carried out in detail. By taking into account the unique features of narrow band-gap Hg_(1-x)Cd_xTe, forward and reverse I-V characteristics and the temperature dependence of R_0A product determined by surface channel current are calculated as a function of the gate bias. A qualitative agreement between experimental and the-oretical results is obtained.

Abstract:在理论分析与计算的基础上研制了一种用于140Mb/s长波光纤通信的新型高灵敏度光接收组件,组件采用混合集成电路技术制成,由InGaAs/InP SAGM雪崩光电二极管和硅双极晶体管互阻型前置放大器组成.工作波长为1.3μm时,理论计算的灵敏度为-48.6dBm,实际测量值为-47dBm,优于现有的PIN/FET光接收组件或Ge雪崩光电二极管.

Abstract:Deep level defects in undoped semi-insulating GaAs are investigated by photo-luminescence (PL) technique. Several PL emissions related to deep level defects and their behaviors have been observed. The emission band at 0.69eV is due to the well known main mid-gap level EL2 and the 0.77eV PL bands attributable to the transition from the con-duction band to the As_(Ga)donor level. It is suggested that the 1.447eV and 1.32eV PL emis-sions are caused by the double acceptors Ga_(As), with levels 78meV and 203meV above the valence band, respectively.

Abstract:By using the X-ray diffraction kinematical theory which assumes ideally sharp interfaces, with computer simulation calculation, the accurate values of (GaAlAs)_m(GaAs)_n/GaAs(001) one-dimensional superlattice structure parameters have been obtained. In addition, the influence of asymmetry of the satellite peak intensity and the presence of the transition layer and the strain has also been analyzed and discussed.

Abstract:The dynamical behaviors of bistability and self-pulsation in optically pumped submillimeter lasers are studied. Bistability emerges in pumping light. It leads to non-existence of partial steady state of submillimeter output. It is easy to give pulsation output. The pulsation frequency increases with increasing pumping intensity.

Abstract:The effect of dual-edge rotations on beam direction is discussed. The dual-edge physicl mode and the mathematic mode of 2-D precise beam steering are established. From the optical ray refraction theorem, the beam steering formula is deduced. According to this formula, which has been proved by an experiment, the control equation of beam direction is made out and the beam steering speed is analyzed in detail.

Abstract:A new coding method-Difference Base-bit Plus Overflow-bit Coding (DBOC) is proposed. Compared with the Huffman coding, this method does not require the statistical properties of coded data, and it can be realized in real-time. Experiments show that the coding efficiency can reach over 90%. With this coding method an excellent result has been obtained in an on-board data compression system for imaging spectrometer.

Abstract:An electrical unit used to control the interim process of step scan mirror (SSM) in Atmosphere Temperature Profile Sounder (ATPS) of meteorological satellites is propounded.The control method solves the view field variation of each optical channel in its measurement period and ensures identity of 20 optical channels of ATPS in the scan measurement minor frame period of 100 msec.

Abstract:A model of three-layer optical neural network is proposed for pattern recognition with rotation invariance. As an example, the model is applied to recognize the projective views of four classes of aircrafts. Investigation of computer simulations shows that the model has good capacity of pattern recognition for patterns both inside and outside the training sets, as well as partially shaded patterns.

Abstract:A new method for readout of the signals from the infrared detectors with high impedance is introduced. The NEP can be reduced to less than half of that in the usual readout electronics of TIA (Trans-Impedance-Amplifier). It also frees the signal readout from some troubles due to the high resistance in TIA.

Abstract:利用半导体激光器作为采样光源的超高速电光采样测试系统(时间分辨率最高可达16.7ps,电压灵敏度为0.26mVHz~(-1/2)).测量了1～5GHz的微波信号和同轴电缆传输线的色散展宽.

Abstract:用Bi_2O_3作为助熔剂,在坩埚可加速旋转的单晶炉内成功地生长出GdBiIG单晶体.将单晶体沿(111)面切割、磨抛成薄片状样品,以磁光调制倍频法测得近红外波段(0.9～1.7μm)磁光旋转谱;并同其它几种稀土铁柘榴石材料相比,发现GdBiIG的磁光优值大,是制作非互易光学器件较为理想的法拉弟旋转介质.