Sagnac干涉仪的几何参量计算

根据空间调制干涉成像光谱仪对视场的要求和小型化目标,通过对分体型Sagnac干涉仪的结构与光路进行分析,研究了Sagnac干涉仪的几何参量与入射光线视场角和孔径之间的关系.推导出满足视场要求的最优化几何参量以及满足横向剪切要求的几何参量修正量,并将其推广到实体型Sagnac干涉仪中,用于指导干涉成像光谱仪的结构设计与优化.     

基于成像光谱仪的Sagnac干涉仪的优化设计

为了满足仪器的轻量化设计要求,研究了成像光谱仪系统中Sagnac干涉仪的优化设计方法,讨论仪器轻量化设计中干涉仪尺寸与系统前置望远镜倍率的制约关系,通过将Sagnac干涉仪展开为平板玻璃的方法对干涉仪的结构和光路进行分析,根据几何关系推导出Sagnac干涉仪几何尺寸与入射干涉仪的光束孔径和视场角的关系表达式,通过该关系式可以求出干涉仪的尺寸极值和对应的系统前置望远镜倍率大小。以某短波红外光谱仪为例,运用推导出的关系式,计算并给出了优化设计结果。     

实体Sagnac干涉仪的设计

以嫦娥一号卫星干涉成像光谱仪为例,介绍了Sagnac干涉仪的设计思想,共光路及横向剪切原理、剪切量的计算方法以及干涉仪分束面上分束区与透射区的设计.该Sagnac横向剪切干涉仪作为嫦娥一号卫星干涉成像光谱仪的核心部件,经检测与在轨运行,表明设计正确,经受了包括月食低温在内的各种恶劣的航天环境的考验,获得了大量清晰的月表多光谱图像.     

干涉成像光谱仪光通量的计算与分析

论述了干涉成像光谱技术的工作原理,采用光线追迹的方法对基于Sagnac棱镜和Savart偏光镜的干涉仪中的光线传播规律进行了分析,推导出了无狭缝式干涉成像光谱仪光通量的精确理论计算公式,并对干涉成像光谱仪中具有代表性的Savart型偏振干涉成像光谱仪光通量和改型Sagnac成像光谱仪光通量进行了分析比较.通过计算机模拟给出了系统光通量随入射角和波长变化的关系曲线.该研究对干涉成像光谱仪的研究和工程化研制具有重要的指导意义. 关键词： 干涉成像光谱仪 光通量 透射比     

干涉仪胶合和准确度分析

介绍了Sagnac型干涉仪错位量与成像光谱仪极限光谱分辨率的数学关系.在干涉仪胶合过程中,以波长为543.5 nm的激光器做为单色光源,利用带有十字丝目标的平行光管、标准镜头(焦距为50.1 mm)、CCD(像元大小为9 μm)探测器组成测试系统,来确定两块半五角棱镜胶合时的错位量.利用波长为632.8 nm的激光器做为单色光源,对整个成像光谱仪的分辨率进行检测,证明采用的干涉仪胶合方法可以保证胶合产生的剪切量满足光谱分辨率的要求.对于影响胶合错位量的因素进行了分析,计算了干涉仪的胶合准确度,得出影响干涉仪胶合错位量的主要因素是读数准确度.     

空间调制干涉成像光谱技术

介绍空间调制干涉成像光谱技术，提出基于实体迈克尔干涉仪的空间调制干涉成像光谱仪，推导了这种仪器的基本几何参数公式与主要误差容限计算公式，总结了其主要特点。文中还归纳出高通量大视场干涉仪原理模型。     

Sagnac棱镜角公差与干涉光谱仪光谱分辨率的关系分析

根据干涉成像光谱仪光谱分辨率对角向差的要求,通过对实体Sagnac干涉仪结构和光路进行分析,从三个相互垂直的方向出发,研究了光谱分辨率和棱镜角公差之间存在的关系;并推导了满足光谱仪光谱分辨率要求的实体Sagnac干涉棱镜的角公差公式;用实例说明了关系式的应用方法,如果不考虑棱镜变形引起的色散及棱镜的面型误差和付氏镜的残余像差的影响,而只考虑棱镜的角误差对光谱分辨率的影响,则通常情况下干涉棱镜的角公差要求较严,约20″以内.     

大孔径静态干涉成像光谱仪的干涉系统分析

从不同方面说明大孔径静态干涉成像光谱仪的特点,介绍其干涉系统的光学原理,分析基于横向剪切干涉仪的干涉系统设计思想,讨论两种高通量大视场横向剪切干涉仪,总结了大孔径静态干涉成像光谱仪的主要优点。     

两种干涉成像光谱技术方案的比较

对"大孔径静态干涉成像光谱技术"方案与以色列学者提出的"两维景物光谱同时测量方法"进行了分析和比较,讨论了这2种干涉成像光谱技术方案中干涉仪与成像光学系统两方面的差异,通过计算机模拟,给出了"两维景物光谱同时测量方法"的光程差非线性变化。受"两维景物光谱同时测量方法"的启发,提出基于横向剪切干涉仪的时间调制型干涉成像光谱技术方案,研究了匀速转动横向剪切干涉仪时,各不同视场像元处光程差的变化规律。     

光纤Sagnac干涉仪中单光子干涉及路由控制

介绍一种光纤中稳定的单光子干涉以及单光子路由控制方式. 使用Sagnac单光子环形干涉仪，通过分时相位调制，改变其顺时针和逆时针两路光子间的相位差. 在Sagnac单光子环形干涉仪中，顺时针和逆时针两路光子走过的是同一段光纤，简便有效地补偿了光纤长度随时间缓变带来的相位涨落，而且两路光子经历了相同的偏振模色散，较好地抑制了偏振态波动对单光子干涉的影响. 在长达5km的1550nm单模光纤中，获得大于98%的单光子干涉和大于90%单光子路由控制；在长度为27和50km光纤环路中，分别获得大于94%和84%单 关键词： 单光子路由 单光子干涉 Sagnac单光子环形干涉仪 量子保密通信     

Simulating the Performance of Michelson- and Sagnac-based Laser Interferometric Gravitational Wave Detectors in the Presence of Mirror Tilt and Curvature Errors

We model the behaviour of single-bounce delay-line dual recycled Sagnac-based interferometer and compare its performance with that of single-bounce Michelson-based system. Geometric imperfections such as mirror tilt and curvature mismatch can strongly influence the performance of the Sagnac device due to the inherently smaller free spectral range (FSR) and higher order mode spacing. This leads to a greater number of higher order modes near, or within the signal band in the signal recycling cavity of the instrument. The important consequence of that is, in general, a greater sensitivity of a Sagnac system to nonideal parameters and imperfections of various kind affecting the performance of a real interferometer. A number of optical configurations have also been examined numerically to determine the best possible optical arrangement, in the presence of such geometric imperfections. We show that there is an optimum choice for the nominal radius of curvature of the end mirrors which results from balancing the loss due to mirror tilt against that due to curvature mismatch.     

Non-contact detection of laser-generated surface acoustic waves using fiber optic Sagnac interferometer

A high powered Q-switched Nd:YAG laser was used to excite the surface waves, and an optical fiber sensor was used to detect the out-of-plane displacements due to the propagating waves. This sensor is based on the fiber optic Sagnac interferometer, which has the path-matched configuration and does not require active stabilization. Quadrature phase bias between two interfering laser beams in the Sagnac loop is applied by controlling the birefringence in an optical path using a fiber polarization controller. A stable quadrature phase bias can be confirmed by observing the interferometer output according to the change of phase bias. Additional signal processing is not needed for the detection of ultrasonic waves using the Sagnac interferometer. The performance of the fiber optic Sagnac interferometer was investigated, and laser-generated surface wave signals were detected using this fiber optic sensor. The developed fiber optic sensor configured in this study is very simple and is effective for non-contact detection of ultrasonic waves.     

转镜式高灵敏度干涉光谱成像仪ROSI的设计方法

介绍了转镜式高灵敏度干涉光谱成像仪(ROSI)的设计计算方法,包括系统基本参量计算、光程差与干涉仪结构参量和转镜角度的关系以及转镜转速与探测器采样帧频的关系等,同时,分析了像点位移与探测器采样之间的失配问题,并给出了最小采样频率公式.     

Hybrid configuration of Sagnac and modal interferometer with high extinction ratio

A hybrid configuration of Sagnac and modal interferometer is proposed to obtain high extinction ratio (ER). Firstly, a modal interferometer based on core-offset splicing of three sections of single mode fiber is obtained through manually controlling the fusion parameters. Then the modal interferometer is inscribed into a Sagnac loop, which can obtain a higher ER by carefully adjusting the polarization controller (PC). There is about 10 dB extinction ratio higher than the modal interferometer. The higher the extinction ratio is, the sharper the bottom of waveform will be, so the wavelength shifts can be measured more accurately when sensing temperature, pressure or other parameters. The measured sensitivity of temperature is 48.67 pm/°C in the band of 1550 nm. It also can be applied in strain measurement, vibration measurement and so on.     

An experimental investigation of the optical switching characteristics using an optical Sagnac interferometer incorporating one and two ring resonators

We present the use of a fiber optic Sagnac interferometer incorporating one and two fiber optic ring resonators to characterize experimentally the optical switching behaviors. These prototypes were formed by the Sagnac interferometer and serially connected to the ring resonators. The input optical signal was launched via one end of the interferometer, where the polarization control was employed to obtain the maximum optical transmission power. Results obtained have shown that the increasing in switching time (i.e. narrower spectral width) and power can be achieved.     

改型萨尼亚克成像干涉仪的光通量

根据菲涅耳公式,通过计算超广角萨尼亚克干涉仪各面的反射、透射系数,得出干涉仪的透射率、出射立体角,最后推导出光通量的具体表达式。代入改型萨尼亚克干涉仪两臂玻璃ZBaF17和QF14尺寸和折射率等参量,得出超广角萨尼亚克干涉仪的出射光强是入射光强的0.4397倍,立体角为1.7316×10-4sr,AΩ=0.4×10-4cm2.sr。     

带有对称啁啾光纤光栅的Sagnac环滤波器

通过在光纤Sagnac环中引入对称啁啾光纤光栅,对带有光纤光栅的Sagnac环梳状滤波器进行了改进,克服了原有滤波器工作带宽小、通带间隔不等的缺点.通过对光栅参量进行适当设计,在中等折射率调制度下,可使光栅同时具有高反射率和大反射带宽,结合Sagnac环可得到大带宽、等间隔梳状滤波器.     

反射式Sagnac干涉光纤电流互感器的传感头误差研究

阐述了反射式Sagnac干涉型电流传感器的原理,对Sagnac型光纤电流传感器进行了深入的理论研究,建立了完整的系统理论模型。采用偏振系统的Jones矩阵对反射式Sagnac干涉型电流传感器的偏振误差进行了研究,并对光纤传感头中的线性双折射、圆双折射对测量准确度的影响进行了模拟分析,从理论上得到了反映影响规律的曲线。仿...