共查询到19条相似文献,搜索用时 62 毫秒
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基于偏光干涉理论,提出一种宽光谱范围内测量波片相位延迟量和厚度的方法。利用矩阵光学方法分析了光谱透射率曲线与中值透射率直线交点波长之间的关系,给出待测波片的相位延迟量、波片厚度等多个物理量的计算公式并进行了误差分析。误差分析表明本方法相位延迟量测量最大误差为3.38°,厚度测量最大误差为0.66μm。实验上利用分光光度计验证了本方法的有效性。本方法能够实现波片多物理量的同时测量,且调节过程对于起偏器、检偏器透光轴方向及待测波片快轴方向无严苛要求,测量过程对波片也无损伤和污染,在波片加工、使用前质量评估等方面都具有一定的应用价值。 相似文献
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波片相位延迟量精密测量新方法 总被引:18,自引:7,他引:11
利用旋转波片的偏振干涉技术,结合机械-光学旋光调制器对光相位的调制,通过判断方波信号的有无,可精密地确定被测定片相位延迟的数值,机械-光学旋光调制器的使用,大大简化被测样品和测试装置中四分之一波片光轴方位的调整,也显著地提高了装置测量的灵敏度和波长测量范围,对环境不作特殊控制,依据本方法建立的测试装置的相对测量误差可小于千分之五。 相似文献
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In this paper, an acoustic shear impedance model is employed to obtain a relation between the viscosity of a Newtonian fluid and phase characteristics of ultrasonic shear wave reflection from a solid-fluid interface. The phase and magnitude of the reflection coefficient can be decoupled in this model. The decoupling allows an independent relation between the acoustic shear impedance (viscosity-density product) and phase of the reflection coefficient. The model was experimentally verified for different fluid-solid combinations. Comparison of the results with the commonly used absolute reflection coefficient method demonstrates that phase measurement provides improved measurements. 相似文献
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《中国光学快报(英文版)》2015,(1)
We present a technique and algorithm for measuring the phase retardation of a wave plate based on spectral transmission curve. Through accurately extracting the intersection points' wavelengths from the spectral transmission curve, the effective phase retardation, absolute phase retardation, order, and physical thickness of the wave plate can be measured simultaneously in a wide spectral range. Experimental results show that the proposed technique has many advantages, such as higher data utilization, simpler extraction algorithm, and no strict requirement for the directions of transmission axes of the polarizer and analyzer, and the fast axis of the wave plate. 相似文献
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分振幅型全Stokes同时偏振成像仪具有实时性好、空间分辨率高、精度高等优点,有很高的应用价值.分振幅型全Stokes同时偏振成像系统利用偏振分束器、1/2波片和1/4波片将入射光Stokes矢量调制在4幅图像中,可解析入射光Stokes矢量. 1/2波片和1/4波片的相位延迟误差对Stokes矢量测量精度有着不可忽略的影响.建立了包含上述两种误差的Stokes矢量测量误差方程,分析了1/2波片和1/4波片相位延迟耦合误差对自然光、0°/45°线偏光、左旋圆偏光等典型基态入射光的Stokes矢量测量误差的影响,推导了任意偏振态的Stokes矢量测量误差的表征方法.在邦加球球面和球内选取不同偏振度的Stokes矢量作为入射光进行仿真.结果表明, Stokes矢量测量误差和偏振度测量误差均随着入射光偏振度的增大而增大.选取入射光偏振度为1时的偏振测量精度评估系统.为满足2%的偏振测量精度, 1/2波片相位延迟误差应在±1.6°内, 1/4波片相位延迟误差应在±0.5°内.这对提高系统的偏振测量精度具有重要意义,为系统设计和研制提供了重要的理论指导. 相似文献
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Quarter wave plates are optical elements commonly used in photoelasticity to obtain circularly polarized light. They divide the incident light field into two linearly polarized orthogonal components with a phase difference of a quarter of the light wavelength. Due to the tolerance in manufacturing, however, the actual phase shifting produced by the plates is affected by an error, which noticeably influences the photoelastic measurements performed by means of various automated methods. This paper presents a technique, based on the phase stepping method, for the full field automatic evaluation of the quarter wave plate error. 相似文献
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Kotlyar VV Khonina SN Kovalev AA Soifer VA Elfstrom H Turunen J 《Optics letters》2006,31(11):1597-1599
We derive analytical expressions containing a hypergeometric function to describe the Fresnel and Fraunhofer diffraction of a plane wave of circular and ringlike cross section by a spiral phase plate (SPP) of an arbitrary integer order. Experimental diffraction patterns generated by an SPP fabricated in resist through direct e-beam writing are in good agreement with the theoretical intensity distribution. 相似文献
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Optical Review - An alternative method is proposed for simultaneously measuring the phase retardation and fast axis angle of a wave plate by utilizing a radially polarized symmetric light beam. A... 相似文献
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Jing-Xin Cui Zi-Dan Wang 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2014,68(9):1-6
The state transfer from cesium nS (n = 45?53) states to Stark (product) states induced by a weak electric field (WEF) pulse was investigated using the state-selective field ionization method in a standard magneto-optic trap (MOT). The WEF pulse shifts the nS Rydberg states that anticross with the (n ? 4) hydrogen-like manifolds, causing state transitions from the initial excited nS state to the Stark states. The mechanism of transfer was investigated by changing the rising and falling time of the WEF pulse and the switching off time of the external field pulse had an important role during the evolution process of product states. The population of the product states is also measured as a function of the principal quantum number and Rydberg densities. 相似文献