A New Comb Circular Polarizer Suitable for Millimeter‐Band Application

This letter presents a new polarizer which has a simple comb structure inside a circular waveguide. The electrical performance of the proposed comb polarizer is optimized by a circular waveguide radius and by the physical parameters of the comb plates. This polarizer is suitable for providing good performance in millimeter‐band application because of its simple structure and low fabrication cost. In our experiments the dual‐band comb polarizer designed in band 1(K) and band 2(Ka) showed good electrical performance without any tuning elements.     

Wideband reflecting frequency-selective surface polarizer for X-band applications

This paper proposed the design of a broadband linear-to-circular reflecting polarizer for X-band applications. The polarizer is designed with three-arm dipole-shaped unit cells with a full ground plane to get wideband performance. The incident linear polarized wave is converted to a right-handed circularly polarized wave upon reflection from the polarizer. The footprint of the unit cell is 9 × 9 mm, which is printed on a FR-4 substrate. Fabricated prototype is measured for its performances like polarization conversion ratio (PCR), fractional bandwidth, and aperture efficiency. The PCR is about 97%, and the fractional bandwidth is 64% with the aperture efficiency of more than 80%. Polarizer performance is analyzed in transverse electric and transverse magnetic modes, and they are stable up to 40° of various incident angles. The polarizer exhibits the 3-dB axial ratio bandwidth from 8 to 12 GHz, which is suitable for satellite applications.     

气溶胶偏振探测仪检偏器方位角优化

非理想透镜组的偏振效应引起偏振测量系统的测量矩阵改变,导致系统最佳配置漂移.为了最大化气溶胶偏振探测仪的信噪比,利用Jones矩阵的方法计算前置光学透镜组的起偏度,并分别以系统分析矩阵的条件数和参数Tr(BBT)为优化参数对检偏器的放置角度进行优化.经过优化,得到检偏器的最佳方位角,在670 nm通道系统分析矩阵的条件数由1.836 0降为1.689 4,在1 641 nm通道系统分析矩阵的条件数由1.977 7降为1.771 4.结果表明,两种优化方法的结果基本一致,经过优化之后两个偏振测量通道的信噪比都提升10%左右.     

直接染料色相特性在染料系偏光膜的应用初探

直接紫01、直接蓝02、直接黄03标准溶液色相系数分别为-0.8498、-3.117、-2.4441,不同染料标准溶液具有不同的色相特性。将直接染料色相特性应用于进料色相检验、染色液色相检测、染色液组成比例测定等,从源头确保染料色相稳定,监控了染色液的色相变化,对于保证染料系偏光膜产品的品质稳定具有重要的意义。     

液晶显示器用偏光片

从偏光片的工作原理和基本结构入手,介绍了组成偏光片的各种膜层的功能与研究现状,以及偏光片的研究发展动向.对偏光片的研究与产业发展提出了几点建议.     

Performance of Polarizers and Coupler in an All Polarization Maintaining Fiber Interferometer

It is given mathematical models and analyze the performance of polarizers and coupler in an all polarization maintaining fiber (PMF) Michelson interferometer. The optical coherent signal to noise ratio (CSNR) of the interferometer is calculated by means of the Jones matrix with cross coupling matrix elements.     

碲镉汞集成偏振探测器应力分析

红外碲镉汞集成偏振探测器的结构是采用多个芯片叠层的方式,由于各层的材料不同,热膨胀系数不同,在低温下工作时各层界面之间存在应力,应力控制的不好会造成芯片裂片等情况,导致探测器性能劣化或无法使用。本文对长波320×256碲镉汞集成偏振探测器的裂片现象进行了分析,对存在的应力运用软件进行了仿真,得到了碲镉汞芯片上的应力值及减小应力的方向。针对仿真分析的结果进行了相应的铟柱降低、碲锌镉衬底减薄的试验,解决了碲镉汞集成偏振探测器的裂片现象。     

一种全自动调节的锁模光纤激光器

通过在非线性偏振旋转环形腔中引入一种全光纤化的角度可调的起偏器,简化了被动锁模光纤激光器的结构,通过调节环形腔内的光纤起偏器和1/4波片的角度就能够实现锁模脉冲的输出。基于此简化结构,引入基于单片机的触发反馈电路,控制偏振片和波片的旋转状态,实现了腔内锁模脉冲的自动调节输出,得到平均功率为8mW的、重复频率为5.6 MHz的全自动锁模脉冲稳态输出。     

Current status and future prospect of in‐cell‐polarizer technology

Abstract— A thin‐crystalline‐film (TCF) polarizer has been developed which can be used internally in liquid‐crystal‐display cells. Based on this material, a manufacturing process has been developed for the fabrication of monochrome LCDs with internal polarizers. A new TCF polarizer material and coating equipment, developed to realize a high‐performance color TFT‐LCD, are discussed.     

宽带式隔板极化器

介绍一种宽频带隔板极化器的设计原理、设计思路及其设计实例。这种极化器具有频带宽、轴比小、圆极化端口隔离度高及体积小的特点。对其功率容量的高频仿真表明他能承受较大功率。他可广泛用于微波馈电网络系统。