具有光学双稳特性的连续波准三能级激光器的一般模型(英文)

简要报道由所建立的具有光学双稳特性的准三能级激光器的一个简单模型所导出的主要结果。该模型从理论上预言,在某些特定条件下激光运转的输入-输出关系可存在滞后回线。Yb掺杂的钒酸盐晶体激光振荡中所出现的光学双稳态行为的主要特征,都可由该模型得到解释。     

光纤通信宽带综合业务数字网中的全光交换技术

本文介绍一种光纤通信宽带综合业务数字网（Ｂ－ＩＳＤＮ）中的全光交换技术。这是未来光纤宽带综合服务网中重要且基本的技术。全光交换是在光水平上实现高速时分交换的，而不是电交换。光交换系统是由光信号写入、读出门—光波导开关阵，光信号存贮器—光双稳半导体激光器，控制器及复用器等几部分组成。本文除描述光交换系统各部件的性能外，还介绍系统的工作原理和性能。     

Orthogonally linear polarized lasers (I) — principle and devices

Two kinds of orthogonally polarized lasers, i.e. Zeeman dual-frequency lasers and four-frequency ring lasers (laser gyros) have been developed since the invention of lasers, in which circularly polarized lights oscillate. This paper summarizes recent progress of the study on orthogonally linear polarized lasers with the standing wave cavity. Firstly, the expression of producing orthogonally linear polarized lights in standing wave cavity, i.e. laser frequency splitting, is given. Almost all the birefringence effects made in laser cavity are used to produce orthogonally linear polarized lights. The effect includes quartz crystal birefringence effect, calcite birefringence effect, stress (photo-elastic) birefringence effect and electro-optical birefringence effect. Secondly, several physical phenomena of orthogonally linear polarized lasers are discovered such as aberrance of frequency splitting curves caused by optical activity of quartz crystal, order-passing of longitudinal modes with frequency splitting and strong modes competition. Finally, because the traditional Zeeman dual frequency laser cannot output frequency difference larger than 3 MHz, the approaches of obtaining larger frequency difference are studied. The sequential results, several kinds of orthogonally polarized lasers, are described, such as birefringence dual frequency lasers outputting a frequency difference from 40 MHz to hundreds of megahertz, birefringence-Zeeman dual frequency lasers outputting a frequency difference from 1 MHz to hundreds of megahertz, the LD pumped YAG birefringence dual frequency laser outputting frequency difference of several gigahertz, and the lasers whose longitudinal mode spacing is c4L instead of c2L.     

用于高预倾角液晶显示器件新取向材料

研制一种新型的能够引起18°高预倾角的取向材料──聚酰亚胺（PI）YB29．探讨预倾角对固化温度、固化时间、摩擦强度的依赖关系；同时研究这种材料的红外吸收光谱、电子能谱及240°扭曲的液晶盒的电光特性．     

Hybrid fiber optical bistability and optical signal processing

A hybrid fiber optical bistable device with electrical feedback has been proposed and analyzed. Bistability operation and some applications for optical signal processing have been realized experimentally. Supported by the National Natural Science Fundation of China Song Qian: born in Aug. 1937, Professor     

Electrical bistable characteristics of poly（phenylene sulfide） thin film deposited by thermal evaporation

Poly（phenylene sulfide） （PPS） is a well-known organic insulator. However, the PPS thin film, deposited by thermal evaporation in vacuum, showed electrical bistable characteristics. The structure of the PPS thin-film device was glass/ITOIPPS （300 nm）/Au. The thin film can be converted to a high conductance state by applying a pulse of 80 V （5 s）, and brought back to a low conductance state by applying a pulse of 100 V （5 s）. This kind of thin film is potential for active layer of a memory device. The critical voltage of the device is about 40 V, while the read-out voltage is 5 V. We tentatively ascribe the bistable phenomenon to the charge transfer from S to C atoms in the PPS molecule chains.     

时滞基因调控网络的双稳定性和局部分岔

研究了含三个节点和两个反馈环的时滞基因调控网络的双稳定性和局部分岔.确定了该网络的正平衡点的个数.通过分析对应的特征方程,建立了网络双稳定性和Hopf分岔的存在性条件.研究结果显示,网络中正反馈环的存在会促使网络出现双稳定状态,而当网络有负反馈环且时滞达到某一临界值时,网络将产生Hopf分岔.数值仿真验证了理论结果的正确性.     

The electro-optical effects of liquid crystallines side-chain polysiloxane

The electro-optical properties of liquid crystalline side chain polymers with siloxane groups as main chain are reported. It is shown that this type of LCPs (liquid crystalline polymers) with main chain (Si−O) has lower glass transition temperature and smaller elastic constant, which leads to shorter response time, especially. The LCPs with strong polar mesogenic groups (CN) have higher positive Δε value, which results in lower threshold voltage and shorter response time. Supported by National Natural Science Foundation of China Li Kaiyang: born in 1963. Lecturer     

Nonlinear optical fiber resonator: Optical fiber bistability

The linear and nonlinear charecteristics of verious optical fiber loop resonators have been processed uniformly using transmission matrix method. It is pointed that in nonlinear operation condition each of those optical fiber loop resonators may be used to make an all-optical fiber bistability device. The configuration, charecterictics and threshold of verious Er-doped fiber loop bistability devices have been calculated, analysised and compared, and the design principle of those devices has been given. Supported by the National Natural Science Fundation of China Zhang Yuancheng: born in Aug. 1938, Professor