基于半导体光放大器中非线性偏振旋转效应单一光缓存环全光时隙交换处理能力研究

对基于半导体光放大器(SOA)中非线性偏振旋转效应(NPR)效应的单一光缓存环多数据包的全光时隙交换(TSI)处理能力进行了理论和实验研究,在使用归纳法导出单一缓存环实现多数据包全光时隙(TSI)必要条件的基础上,针对各种全光TSI操作要求得出了相应光数据包的调度方案,在实验上,以基于SOA中NPR效应的单一光缓存环实验系统,开展了多数据包全光TSI操作的实验研究,根据上述光数据包理论调度方案进行相应系统参数设定,进行了速率为10 Gb/s的3个和4个数据包的全光TSI实验,实验结果与理论预期相符合,研究成果为减少昂贵SOA元件的用量、简化基于光缓存环全光TSI系统的结构提供了可靠依据,对推进全光TSI技术的发展具有重要意义。     

全光学高灵敏度铷原子磁力仪的研究

报道了一种全光学的高灵敏度铷原子磁力仪.其原理是基于激光束与处于微弱磁场中的铷原子的相互作用.这种相互作用与铷原子所处的环境中的磁场有关,因而通过测量透过铷原子气体的激光强度的变化可以获得磁场信息.分析了该磁力仪的工作原理,建立了相应的实验装置,并对其性能进行了测试.结果表明实验结果与理论相符合.进一步研究了影响磁力仪灵敏度的一些因素,提出了优化各参数来提高磁力仪灵敏度的方法.     

Effective generation of red-green-blue laser in a two-dimensional decagonal photonic superlattice

We demonstrate the effective generation of red, green and blue (RGB) light in a two-dimensional decagonal quasiperiodic LiNbO₃ nonlinear crystal. Owing to the unique abundance in reciprocal vectors (RVs), the RGB signals were generated directly by frequency doublings. Thus the conversion efficiencies of the RGB light were much higher than previously recorded. In addition, the same results were obtained when the crystal was rotated by integral multiples of π/5. This result will aid in the effective generation of RGB in multiple directions and may have important applications in laser-based projection displays. PACS 42.65.Ky; 42.72.Bj; 42.79.Nv     

Electro-hydrodynamic fabrication of ZnO-based dye sensitized solar cells

The electro-hydrodynamic (EHD) technique has been successfully applied for manufacturing ZnO photoanode in dye sensitized solar cells (DSSCs). Porous structure of ZnO film after calcinations was beneficial to the absorption of dye and infiltration of electrolyte. By using ionic liquid as an electrolyte, a high short-circuit photocurrent density of 12.1 mA/cm² was attained and the overall photo-to-electric energy conversion efficiency (η) was 3.4% under an AM-1.5 illumination at 100 mW/cm². At the same time, the influence factors on the solar cell performance, such as the concentrations of polyvinyl alcohol (PVA) during EHD process and light intensity were discussed. PACS 81.07.Bc; 84.60.Jt; 81.15.Rs     

基于SERS与PCA-SLR实现乙基对氧磷定量检测

利用表面增强拉曼光谱(SERS),结合主成分分析(PCA)与分段线性回归(SLR)算法实现乙基对氧磷的定量检测。首先采集820～1 630 cm-1乙基对氧磷溶液SERS,并对820～1 630 cm-1(全范围)与845～875 cm-1(特征范围)光谱分别进行标准正态变换(SNV)、多元散射校正(MSC)、一阶导数绝对值、二阶导数等预处理;然后经PCA降维后利用SLR建立乙基对氧磷溶液浓度预测模型。通过对比不同模型的预测准确度,发现特征范围光谱采用MSC预处理后所建立的模型为最优,总体预测均方误差值(RMSEP)为0.33,满足乙基对氧磷定量检测的需要。     

光学偏振玻璃的发展

光学偏振玻璃大约是 15年前研制和开发出来的 ,投入市场后 ,以其优异的性能在偏振片领域独占一方 ,尤其是在光纤传感器和高性能大屏幕液晶显示领域 ,光学偏振玻璃占据了主导产品的地位。详细综述了光学偏振玻璃的发展历史、基本原理和结构、生产工艺以及产品性能 ,并指出了存在的问题和发展方向     

非共轴激光雷达几何因子分析与测量

介绍了非共轴激光雷达几何因子的物理意义,分别通过理论分析和试验测量给出了求解几何因子的方法。结合自行研制的CSY-1便携式能见度激光雷达,将两种方法得到的几何因子进行对比,讨论了系统参数对几何因子的影响,从而实现了对激光雷达系统优化设计的可能性。     

Optical switching based on the manipulation of microparticles in a colloidal liquid using strong scattering force

This paper demonstrates the realization of an optical switch by optically manipulating a large number of polystyrene spheres contained in a capillary.The strong scattering force exerted on polystyrene spheres with a large diameter of 4.3 μm is employed to realize the switching operation.A transparent window is opened for the signal light when the polystyrene spheres originally located at the beam centre are driven out of the beam region by the strong scattering force induced by the control light.The switching dynamics under different incident powers is investigated and compared with that observed in the optical switch based on the formation of optical matter.It is found that a large extinction ratio of ～ 30 dB and fast switching-on and switching-off times can be achieved in this type of switch.