Fabry-Perot干涉仪的新应用

阐述了Ｆａｂｒｙ－Ｐｅｒｏｔ腔的工作原理以及在精细光谱结构研究、激光技术等领域的应用．结合作者的工作，给出了Ｆａｂｒｙ－Ｐｅｒｏｔ腔在微机械传感器和高速光电探测仪器研制这两个方面的新应用．     

Fabry—Perot干涉仪的新应用

阐述了Fabry-Perot腔的工作原理以及在精细光谱结构研究、激光技术等领域的应用，结合工作的工作，给出了Fabry-Perot腔在微机械传感器和高速光电探测仪器研制这两个方面的新应用。     

Fabry-Perot干涉仪用于托卡马克等离子体氢氘比测量

本文在国内首次将Fabry-perot干涉仪用于托卡马克等离子体诊断。实验采用一台压电驱动式Fabry-perot干涉仪通过对H_α和D_α谱线轮廓的测量来推算等离子体的氢氘含量比,从而避免了在传统的氢氘比测量中因重复放电所引起的不准确性。     

斐索光纤干涉仪在超声检测中的应用

针对激光超声中固体表面波的传播特性,研究了一套斐索光纤干涉仪系统并实现了对YAG激发的铝材料表面波的检测.该光纤干涉仪基于共光路干涉原理,消除了其他表面波检测手段的诸多弊端,具有环境要求低、结构简单、易于调节、频响高且为非接触式测量等优点,实验表明该干涉仪适合于激光超声检测.     

多模光纤Fabry-Perot干涉仪的分析

本文分析了多模梯度光纤Fabry-Perot干涉仪的干涉光场分布,讨论了弯曲损耗、光源单色性以及耦合系数等因素对干涉条纹清晰度的影响.     

光泵腔式NH3分子远红外激光的最佳工作气压研究

通过求解量子系统的密度矩阵方程，采用迭代法计算了光泵腔式ＮＨ３分子远红外激光的输出功率密度。在此基础上，对光泵腔式远红外激光的工作气压进行了理论研究。结果表明最佳工作气压与腔的功率反射系数、样品管的长度以及泵功率密度等工作参数之间是相互制约的，同时与参与激光过程的能级有关。在实验上采用电感性金属栅网作为反射器，设计制作出长度分别为１００ｃｍ、２０ｃｍ和１０ｃｍ的Ｆａｂｒｙ－Ｐｅｒｏｔ腔式远红外激光器，然后和ＴＥＡ－ＣＯ２激光器作泵浦源，成功地获得光泵ＮＨ３分子远红外激光，测量结果表明理论计算与实验数据相符。     

用激光外差干涉仪探测金属表面超声振动的实验设计

将激光外差法测量的科研成果转化为物理专业实验，设计了易于调节的激光外差干涉系统，实现了外差信号的接收，用压电超声装置代替激光超声装置，使实验系统小型化。     

基于自准直效应的Fabry-Perot干涉仪的设计

报道了基于圆柱型光子晶体自准直效应的低功耗Fabry-Perot干涉仪。该干涉仪是在二维光子晶体中引入两排线缺陷构成的。引入的线缺陷具有高反射率和低透射率。在自准直频率范围0.187c/a~0.201c/a,线缺陷的透射率介于20.77%~40.65%。利用时域有限差分方法对FPI的透射谱进行研究,结果表明对两排缺陷的间距d即使进行微小的扩大也会引起透射峰向低频移动,透射谱的自由光谱范围和透射峰的频率随着d的增大而变小,透射谱的半高宽会随着线缺陷的反射率的提高而逐渐变小。     

共焦球面扫描干涉仪精细常数测量研究

提出了测量共焦球面扫描干涉仪精细常数实验方案.该方案利用示波器测量共焦球面扫描干涉仪扫描两相邻透射峰时间Δt_(2π)及扫描单个透射峰相位半宽度所需时间Δt_φ,共焦球面扫描干涉仪的精细常数为Δt_(2π)与Δt_φ比值.利用该方案,在不同扫描频率及不同电压下,测量了共焦球面扫描干涉仪精细常数.测量结果表明,在不同锯齿波扫描频率及不同驱动电压下,实验所测得精细常数与厂家所提供理论值趋于一致,实验结果证明该测量方案可靠可行.同时本文对测量数据中,Δt_(2π)及Δt_φ与扫描频率及扫描电压成反比这一实验现象进行了理论分析.     

Fabry-Perot干涉技术及其在疲劳损坏检测中的应用

从激光超声的特点出发,分析目前主要的超声检测技术,重点研究Fabry-Perot干涉仪的原理和工程应用。共焦Fabry-Perot干涉仪具有只对固体表面的振动速度灵敏、有较大的入射孔径、集光能力强等优点,克服了其它干涉检测技术对工作环境的严格要求,广泛应用于工业生产中。为检测碳钢的疲劳破坏,设计了一个激光超声检测系统,分析不同超声频率和加载不同循环压力造成的疲劳损坏情况。     

Temperature-independent refractometer based on fiber-optic Fabry–Perot interferometer

A miniature fiber-optic refractometer based on Fabry–Perot interferometer (FPI) has been proposed and experimentally demonstrated. The sensing head consists of a short section of photonics crystal fiber (PCF) spliced to a single mode fiber (SMF), in which the end-face of the PCF is etched to remove holey structure with hydrofluoric (HF) acid. A Fabry–Perot interference spectrum is achieved based on the reflections from the fusion splicing interface and the end-face of the core of PCF. The interference fringe is sensitive to the external refractive index (RI) with an intensity-referenced sensitivity of 358.27 dB/RIU ranging from 1.33 to 1.38. The sensor has also been implemented for the concentration measurement of λ-phage DNA solution. In addition, the dip intensity is insensitive to the ambient temperature variation, making it a good candidate for temperature-independent bio-sensing area.     

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 .     

An Extrinsic Fabry–Perot Optical Fiber Sensor Based on Nano-Magnetic Fluid

Abstract

An extrinsic Fabry–Perot optical fiber sensor based on nano-magnetic fluid and a Fabry–Perot interference is presented for magnetic field measurement. The sensing fiber end is coated with a thin film of SU-8 photoresist; immersing it into a nano-magnetic fluid forms a magnetic-field-dependent extrinsic Fabry–Perot interference. The relationship between the fringe contrast and magnetic field is analyzed in different concentrations of the magnetic fluid, and the concentration of 25% is most suitable for the measurement of the magnetic field intensity. The stability of the sensor is also addressed.     

Determination of the spectral width of Raman gain regions for different far infrared laser gases using a metal mesh Fabry Pérot interferometer

In this paper we report on the determination of the spectral width of Raman gain regions for different far infrared laser gases using a metal mesh Fabry Pérot interferometer. By use of broadband pump radiation emitted from a high pressure CO₂ laser we generated far infrared radiation within the Raman gain regions via stimulated Raman scattering. The spectral width of the far infrared radiation was determined using a Fabry Pérot interferometer in high interference order. We applied the method to study stimulated Raman scattering in D₂O and methylfluoride at different gas pressures.     

探测超声微振动的激光外差干涉仪

激光超声是一项新兴的技术，可应用于非接触检测。本文作者研制的探测超声微振动的激光外差干涉仪，该装置具有结构简单，不必采用复杂的反馈回路，只要采用简单的滤波就可以消除外界环境引起的干扰，更重要的是它的测量结果与干涉仪的初相无关，为实际应用提供了很大方便。     

Dynamic analysis of directly modulated Fabry–Perot laser diodes using time-domain modeling with random noise fluctuations

Based on time-domain laser modeling, we have systematically evaluated multi-mode excitation and mode competition in directly modulated Fabry–Perot laser diodes biased with different current levels. In our simulation, random noise fluctuations depending on the bias current are included since they play an important role in determining the number of lasing modes. Multi-mode excitation and mode competition occurred at the biased current below the threshold current can be explained with the aid of frequency chirp at turn-on and gain difference in between '0' and '1' bits. The positive frequency chirp (25 GHz for lasers biased below the threshold current and 15 GHz for lasers biased above the threshold current) affects to enhance the probability of multi-mode excitation in low-frequency region during turn-on delay.     

Generation of sub‐terahertz repetition rates from a monolithic self‐mode‐locked laser coupled with an external Fabry‐Perot cavity

A novel scheme to multiply the repetition rate of a monolithic self‐mode‐locked laser for generating sub‐terahertz pulse sources is successfully demonstrated. A coated Yb:KGW crystal is designed to achieve a self‐mode‐locked operation at a repetition rate of 24 GHz with an average output power exceeding 1.0 W at a pump power of 4.8 W. A partially reflective mirror is utilized to combine with the output surface of the gain medium to constitute an external Fabry‐Perot cavity. It is theoretically and experimentally verified that adjusting the external cavity length to satisfy the commensurate condition can lead to the frequency spacing to be various order harmonics of the mode spacing of the monolithic cavity. The maximum pulse repetition rate of the laser output can be up to 216 GHz and the pulse duration is as short as 330 fs. More importantly, the overall characteristics of the first‐order temporal autocorrelation traces obtained by sequentially scanning the external cavity.length display an intriguing phenomenon of temporally fractional revivals, similar to the feature of spatial Talbot revivals.

     

Effect of Fabry‐Perot resonances in disordered one‐dimensional array of alternating dielectric bi‐layers

We study numerically and analytically the role of Fabry‐Perot resonances in the transmission through a one‐dimensional finite array formed by two alternating dielectric slabs. The disorder consists in varying randomly the width of one type of layers while keeping constant the width of the other type. Our numerical simulations show that localization is strongly inhibited in a wide neighborhood of the Fabry‐Perot resonances. Comparison of our numerical results with an analytical expression for the average transmission, derived for weak disorder and finite number of cells, reveals that such expression works well even for medium disorder up to a certain frequency. Our results are valid for photonic and phononic one‐dimensional disordered crystals, as well as for semiconductor superlattices.     

应用LPFG/EFPI集成式光纤传感器实现温度及应变的同时测量

叙述了基于LPFG/EFPI的集成式光纤传感器的结构、温度和应变同时测量的原理及实验,首次制作了该传感器并测试了其性能.实验结果表明温度精度为±0.5℃,应变精度为±20με,可满足实际应用的要求.