非线性介质F—P干涉仪光束输出特性的理论研究

本文对准直光束射入含有非线性介质的Ｆ－Ｐ干涉仪内的光场分布进行了研究。由于非线性介质与光的作用，从Ｆ－Ｐ干涉仪出射的光束截面上的相移随位置的改变呈一定的分布，进而引起了干涉义的透射率和输出光束重新分布。当干涉仪两个面的反射系数较大时，输出光束截面出现光强和相移的跃变。这种现象与以前在平面波假设下所得的光强分布所得结论有较大的不同。     

F-P多光束干涉仪的发明者--法布里和珀罗

10 0多年前 ,查尔斯·法布里 (CharlesFabry)和艾尔弗雷德·珀罗 (AlfredPerot)发表了人们现在称之为法布里 -珀罗干涉仪的最重要的论文 .法布里 -珀罗干涉仪对于当前光学和天体物理学的研究是非常重要的仪器 .文章主要介绍了法布里和珀罗的生平与工作 .2 0世纪初 ,由于他们对光学和光谱学的贡献受到了全世界的物理学家的高度尊敬 .后来他们对天体物理学也做出了许多重要的贡献 ,其中包括 1913年法布里与BuissonH对地球大气中的臭氧层的发现 .法布里教授曾是中国物理学家严济慈的恩师 .文章也简要评述了法布里教授对严济慈研究工作的深刻影响 .     

法布里—珀罗干涉仪实验中几个问题的讨论

一、引言法布里一拍罗于涉仪实验（以下简称F－P实验）是一个典型的等倾干涉实验，其干涉花样比牛顿环实验更清晰、更细锐．因其调节有一定难度，某些实验者往往将精力主要集中于调节上，忽略了一些值得讨论的问题．本文现对以下三个问题进行讨论：1．干涉环的宽度；2．测量误差；3．从第几圈干涉花样开始测量比较合理，以及至何时第一圈干涉花样算形成完整．二、F－P实验中的光强分布因为光的干涉花样是光强分市的表现，所以，对上述三个问题的讨论应从光强分布公式”‘的讨论入手，式中I0为入射光强，R为F－P标准具镀银面的反射系数；…     

F－P滤波窗在半导体光孤子源中的作用

利用光谱窗滤波法对增益开关半导体激光器输出光脉冲消啁啾进行了理论分析，在线性啁啾近似下得到了啁啾光脉冲经Ｆ－Ｐ后的谱宽表达式，给出了经Ｆ－Ｐ后光脉冲的宽度、波形以及自相关测量时的波形因子与Ｆ－Ｐ参数的关系曲线．实验结果与理论分析基本一致．     

北京同步辐射装置3B3前端区和光束线输出特性诊断

北京同步辐射装置(BSRF)新建3B3光束线通过重新安装、准直和在线调试, 其光学输出特性均达到或超出原设计指标, 光通量达到7×10¹⁰phs/s(100mA下), 能量分辨本领(E/ΛE)达到5000(3.206keV). 介绍了前端区和光束线输出光学特性的诊断方法和光束线在线调试过程, 给出了输出特性的测试结果. 分析了BPM与荧光靶在调试过程中所起的作用及局限性.     

毛细管干涉仪的理论分析

从几何光学出发,推导了毛细管干涉仪的从柱面透镜到接收屏的光线的光程．对光线追迹模拟,结果表明毛细管干涉仪的干涉条纹的形成可用双光束的干涉来解释．从柱面不同位置入射的两条光线可能具有相同的光程,而且从柱面透镜不同位置出发的两条光线可能到达接收屏的同一点,当它们满足相干条件时,就会形成干涉条纹．建立了干涉条纹的计算机模拟程序, 模拟了毛细管中液体折射率、毛细管内径、外径对干涉条纹的影响. 结果表明实验中应使用薄壁毛细管, 由于干涉条纹对柱面透镜到毛细管之间的距离非常敏感, 为提高精度, 建议在实验中用已知折射率的标样来确定这一距离.     

北京同步辐射装置3B3光束线传输效率及输出特性的计算

从北京正负电子对撞机储存环弯转磁铁光源的辐射特性入手, 分析了BSRF-3B3光源及其光束线光学系统的输出特性, 分别给出各光学元件的传输效率和采用不同单色器晶体在样品处的计算结果. 为光束线设计、调试及诊断提供了理论依据. 同时也为弯转磁铁光源光束线的输出特性的计算, 提供了一个模式.     

利用F－P标准具组实时测量被动入射激光波长

从理论上分析利用Ｆ－Ｐ标准具组实时测量被动入射激光波长的能量分布及信噪比，提供了计算公式及误差分析，给出了实验光路图、处理软件框图和一组实验照片；最后对给出的实验结果数据进行了讨论。     

Enhanced four-wave mixing in a high-finesse highly nonlinear fiber Fabry-Perot resonator

We have achieved a four-wave mixing process in a high-finesse highly nonlinear fiber Fabry-Perot resonator, where the amplified signal and idler were enhanced in transmission by 6 dB and 10 dB respectively comparing with those in a single fiber. We used a 6 m long low-loss Fabry-Perot resonator with two high-reflectivity fiber Bragg gratings written directly into a highly nonlinear fiber provided by Sumitomo Electric Inc., where the minimised intracavity loss resulted in the finesse in excess of 100. The resonator length was locked for 30 min by means of a modified Pound-Drever-Hall technique. The maximum intracavity power was increased by 14.3 dB by increasing the stimulated Brillouin scattering threshold with periodic phase modulation by a pseudo-random bit sequence, with length matching that of the cavity.     

The design and preparation of a Fabry-Perot polarizing filter

A novel single-cavity narrowband Fabry-Perot （FP） polarizing filter at normal incidence, constructed from a sandwich structure with sculptured anisotropic space layer and symmetric isotropic HR mirrors, is designed and prepared. The optical performances of transmittance, phase shift, central wavelength, and bandwidth for two polarized states are analyzed with the characteristic matrix. The numerical studies accord reasonably well with the experimental results. It is demonstrated that the polarization state of the electromagnetic wave and phase shift can be modulated by employing an anisotropic space layer in the polarizing beam splitter system. The birefringence of the anisotropic space layer provides a sophisticated phase modulation by varying the incidence angles over a broad range to have a wide-angle phase shift.     

Dielectric materials for gyrotron output windows

The dielectric parameters of materials for gyrotron output windows measured in the range 65–300 GHz are given. The special attention is paid to the spread of values of the refractive index and loss tangent of dielectrics produced by different firms. The refractive index and loss tangent are measured for sapphire at the cryogenic temperatures and for boron nitride and silica glass at the temperatures 300–1000K.     

The enhanced nonlinear stimulated emission effect of an atomic beam by using an injection Fabry-Perot spherical cavity

When a high-intensity laser beam passes through a resonant atomic beam,non-linear stimulated emission effect will be produced.This effect can be enhanced up to two or-ders of magnitude by using an injection Fabry-Perot cavity.Experiments show that thismethod has high measuring contrast and high spectral resolution when it is used to measure thehyperfine absorption lines of atomic beams.     

Determination of wavefront aberrations using a Fabry-Perot cavity

A new method for detecting wavefront aberrations using a Fabry-Perot cavity is described. A Fabry-Perot cavity transmits the cavity eigenmode which satisfies a resonance condition, while the other modes are reflected from the cavity. Utilizing this mode discrimination property, we can extract aberration components from incident aberrated light as reflected light from the cavity. Under the condition of a weak aberration, the amplitude profile of the reflected light can be approximated to the wavefront aberration. We can therefore determine the wavefront aberrations in a visualized form with the technique. We present the detection scheme and the first experimental verification of the technique. The detected aberration using this technique was in good agreement with the result on the basis of a conventional wavefront sensor.     

基于Fabry-Perot腔阵列的集成化微型光谱仪方案及模拟

提出了一种微型光谱仪,该微型光谱仪基于法布里-珀罗腔滤波性的阵列式微型光谱仪。其基本结构是在硅基底上实现多个不同腔长的阵列,从而实现对多个波长的监测。探测单元即为一个法布里-珀罗腔,由硅基底-金属薄膜-二氧化硅层-金属薄膜构成。进行了相应的模拟计算,结果表明在基本结构为铝膜(14 nm)-SiO₂-银膜(39 nm)的情况下,通带半宽度可达到15 nm,单个探测单元面积仅为0.14 mm×0.14 mm即可达到微型光栅式光谱仪(最小体积在cm量级)的光通量,整个光谱探测部分体积仅在mm量级。该微型光谱仪设计尺寸在几个mm的量级、无活动部件,可以同时对多个波长进行检测,并可望利用现有IC加工手段实现光谱仪传感器化。     

Volume hologram – Coupled Fabry-Perot etalon

The volume hologram is considered as a series of coupled Fabry-Perot etalon. The interference of multi beam makes the band width of volume hologram very narrow. The positive feedback of Fabry-Perot provides high diffraction efficiency of volume hologram. The computer simulations for volume hologram based on the new model shows a good consistency with the coupled wave theory and the experimental results.     

Transmitted characteristics for a Gaussian beam passing through a misaligned Fabry-Perot interferometer

After deriving the expression of the intensity of the transmitted beam for a Gaussian beam passing through a misaligned FPI, the influence of the nonparallelism in FPI mirrors alignment on the transmission of a Gaussian beam has been investigated numerically. The results show that the energy profile of the total transmitted beam appears multiple sub-peaks structure; with the increase of the nonparallelism in FPI mirrors alignment, the number of the sub-peaks raises, the peak intensity of the transmitted beam has a declining tendency, and the peak intensity position of the total transmitted beam is shifted.     

双法布里—珀罗干涉仪传感模型的理论分析

本文提出了一种用发光二极管作为光源、用自聚焦透镜构成法布里-珀罗腔的双法布里-珀罗干涉仪光纤位移传感模型.根据部分相干光的干涉理论,得到了这个传感模型输出光强与两个法布里一珀罗干涉仪腔长之差的函数曲线.     

Analysis of dynamic pattern formation in nonlinear Fabry-Perot resonators

We present a detailed analysis of transverse effects and pattern formation in bistable optical elements. The system we investigate consists of a Fabry-Perot resonator for the optical feedback element with a nematic liquid-crystal cell used as an optically nonlinear intracavity medium. On illumination with a cw-laser beam, the system causes the beam to break up into several individual spots, passing through several transitions before finally reaching a stationary state. We devise a theoretical model which is used as the basis for numerical simulations of the system. The simulation results are in good agreement with experiment. Finally, we characterize the principal instability of the system using a linear stability analysis of the theoretical model.