提高V棱镜折射仪测试精度的V槽研究

用V棱镜折射仪测量光学玻璃的折射率,常规测试精度可以达到±5×10-5。通过分析V棱镜折射仪折射率误差的原因发现,V槽与被测件折射率越接近,测量误差越小,因而对V槽进行了改进。在最新的光学玻璃nd-vd图上选取6种高品质材料,将原来的V槽进行细分,组成新的测试标准块。对生产产品进行了实测,与标准样块进行了比对。实测结果表明,采用改进的V槽可以得到更精确的测量结果,测试精度可以达到±2×10-5。     

影响棱镜角度精度的几个因素及解决方法

由于在棱镜制造过程中的每一道工序都有可能影响角度精度 ,所以对角度精度的控制始终贯穿于整个制造过程。讨论了在制造过程中的五个主要因素对角度精度的影响 ,并给出了解决方法     

利用双棱镜干涉测量波长的改进方法

在传统的利用双棱镜测量波长的实验方法基础上,介绍一种改进的实验测量方法。     

双棱镜的像差

对图1所示双棱镜干涉实验(仅画出上半部份),作者在前文中已推得折射线方程 Y=Xctg(α+θ_2′)+[(?)tgαtg(θ_1)′+(?) tgα-(?)tgαctg(α+θ_2′)+(?)ctg(α+θ_2′)]÷[tgα+tg(θ_1)′]     

国产光学设备棱镜高效制造技术

棱镜制造技术采用刚性胶盘、靠体翻转加工和配以若干类特种粘接胶，在国产设备组成的高效生产线上一次性完成调整铣磨、高速精磨和高速抛光的全部加工。经过六年的实际生产检验，这项技术是成功的，经济效益是令人满意的。     

锥体棱镜的加工与检验

锥体棱镜是一种重要的逆向反射器 ,它广泛应用于远距离测距等方面。同时也是一种精度高、加工难度大的光学元件。介绍了锥体棱镜的两种加工工艺及其特点 ;着重叙述了立方体切角的方法 ,即借助于 T型抛光定位夹具和切角定位夹具加工锥体棱镜的工艺过程。同时给出了当用干涉法测量锥体棱镜时 ,干涉图的判别原则和棱镜合格时干涉图的特点。该方法对综合角度误差≤ 3″的锥体棱镜来说可获得很高的合格率。     

基于多级组合棱镜提高激光中心波长检测精度的研究

为了在保证抗干扰能力不下降的条件下提高对激光中心波长的检测精度,设计了多级组合棱镜系统,并提出了多级组合棱镜的干涉条纹拼接处理方法及相位耦合的计算公式.通过计算多级组合棱镜的干涉图强度、光程差函数及光谱分辨率,分析了采用三块子棱镜的组合结构的光谱获取,给出了用于分段干涉条纹拼接的处理方法及步骤,最终光谱分辨率可达2.8...     

高精度棱镜的高效制造技术

高精度棱镜在其角度误差、面形误差和表面粗糙度等方面都具有较高的要求。对这类棱镜如何实现大规模生产,降低生产成本,是近几年来光学制造行业正在研究探索的一道难题。本文以斯米特屋脊棱镜的制造为例,通过四个方面的分析,对高精度棱镜的高效制造技术进行了阐述。     

用双棱镜测波长方法研究

本文介绍了一种用棱镜测波长的方法和快速调出干涉图样的方法。     

大口径锥体棱镜的制造与测量方法

锥体棱镜的设计要求一般为α≤5″,N=0.25,ΔN=0.2,是一种加工难度大,测量精度要求高的棱镜。采用对立方体加工形成锥体棱镜的制造方法,应用激光干涉测量技术对加工过程中的直角误差Δ90°、棱镜的出射光与入射光的偏离角误差α进行测量与控制,是一种既能满足设计指标要求又能满足大批量生产要求的加工方法。该加工方法适合于入射面圆直径在Φ50mm^Ф80mm的锥体棱镜。     

一种提高激光陀螺惯导系统精度的方法

为了获得优于0.1n mile/h水平的高精度激光陀螺惯导系统,对控制系统绕单轴转动来补偿陀螺误差的方法进行了研究。分析了补偿的原理,并利用通用的精度为0.4n mile/h左右的机抖激光陀螺捷联惯导系统进行了实物实验,实验结果证明采用单轴转动的方法可使系统定位精度提高到1n mile/24h的水平。     

Evaluation of Doppler shifts to improve the accuracy of primary atomic fountain clocks

We demonstrate agreement between measurements and ab initio calculations of the frequency shifts caused by distributed cavity phase variations in the microwave cavity of a primary atomic fountain clock. Experimental verification of the finite element models of the cavities gives the first quantitative evaluation of this leading uncertainty and allows it to be reduced to δν/ν=±8.4×10(-17). Applying these experimental techniques to clocks with improved microwave cavities will yield negligible distributed cavity phase uncertainties, less than ±1×10(-17).     

Using single wavelength light to improve the synchronization accuracy of the White Rabbit system

We demonstrate a new synchronization method for the White Rabbit system. Signals are transmitted in a single mode fiber in both directions with the same light wavelength. Without the complex calibration process of the fiber asymmetry parameter, the new method reduces the effect of chromatic dispersion and improves the synchronization accuracy. The experiment achieves timing synchronization accuracy below 200 ps over 50 km fiber constructed by different companies' fiber spools. The proposed method would make White Rabbit technology immune to the chromatic dispersion of fiber links and can be applied to long distance synchronization.     

提高多光源汇聚光斑中心定位精度的形态学滤波方法

在激光指令传输中,为形成较大的光覆盖区域并增大光源的作用距离,将多个特性相同的激光器矩阵排列,构成组合光源。针对点阵多激光管光源在开放环境下成像光斑具有多个光能中心的特点,采用形态学滤波中的开启、闭合运算,去除背景噪声斑点,平滑光斑内部的小光斑叠加和干涉造成的不规则条、孔,使得能以简化的分割和定位算法,快速获得接近实际的完整光斑边界,光斑中心定位精度的均方差不大于1.2%。该方法能快速、高精度定位这种叠加光斑的中心,为远距离激光对准和测控提供了可靠的精度和时效保证。     

New designed helical resonator to improve measurement accuracy of magic radio frequency

Based upon the new designed helical resonator, the resonant radio frequency (RF) for trapping ions can be consecutively adjusted in a large range (about 12 MHz to 29 MHz) with high Q-factors (above 300). We analyze the helical resonator with a lumped element circuit model and find that the theoretical results fit well with the experimental data. With our resonator system, the resonant frequency near magic RF frequency (where the scalar Stark shift and the second-order Doppler shift due to excess micromotion cancel each other) can be continuously changed at kHz level. For ⁸⁸Sr⁺ ion, compared to earlier results, the measurement accuracy of magic RF frequency can be improved by an order of magnitude upon rough calculation, and therefore the net micromotion frequency shifts can be further reduced. Also, the differential static scalar polarizability Δα₀ of clock transition can be experimentally measured more accurately.     

A variable order approach to improve differential quadrature accuracy in dynamic analysis

Differential quadrature (DQ) is a numerical technique which can produce highly accurate results by using a considerably small number of grid points. When it is applied to dynamic equations, however, DQ may exhibit dynamic numerical instability. The present paper analyzed the sources of dynamic numerical instability through a simple example, and the main finding is that dynamic stability is dominated by the grid points near and on boundaries. Based on this, we propose a variable order approach which is characterized by applying different DQ schemes to the grid points near boundaries and grid points far away from boundaries. Numerical examples of both linear and non-linear dynamic equations show that the variable order approach presented in this paper may greatly improve dynamic stability, producing convincing results.     

Method to improve spatial uniformity with lightpipes

A heuristic method to obtain lightpipes that provide both collimation and good spatial uniformity is proposed. The change in shape that is likely to improve spatial uniformity, with minimal efficiency loss, can be predicted. Several case studies where this technique has been used are presented.     

Method to enhance the accuracy of the retardance measurement of quarter-wave plates

A novel method used for the enhancement of the accuracy of the retardance measurement of a quarter-wave plate employing two polaroids and a prism is reported under the condition of knowing the direction of the fast-axis of the plate. The theoretical analysis of the principle and the uncertainty formula are given. An application example is also demonstrated. The measured result of the example is verified with an experiment. The main advantages of this method include the accuracy enhancement, simple measuring setup and easy operation.