多芯光纤端面上对称耦合双环微腔气体传感特性研究

光纤传感具有耐高温、抗腐蚀、无需供电、灵敏度高和可集成等优点,在光纤端面上设计制备微纳传感结构是实现探针式光纤传感器的重要途径.本文以七芯光纤端面作为平台,在其上设计了微纳波导对称耦合的双环微腔光学系统.环形微腔与微纳波导间隔一定距离,实现倏逝波耦合,波导中的光耦合进入腔内激发其高品质因子回音壁共振.当外界气体刺激改变...     

Parametric oscillation in vertical triple microcavities

Optical parametric oscillation is a nonlinear process that enables coherent generation of 'signal' and 'idler' waves, shifted in frequency from the pump wave. Efficient parametric conversion is the paradigm for the generation of twin or entangled photons for quantum optics applications such as quantum cryptography, or for the generation of new frequencies in spectral domains not accessible by existing devices. Rapid development in the field of quantum information requires monolithic, alignment-free sources that enable efficient coupling into optical fibres and possibly electrical injection. During the past decade, much effort has been devoted to the development of integrated devices for quantum information and to the realization of all-semiconductor parametric oscillators. Nevertheless, at present optical parametric oscillators typically rely on nonlinear crystals placed into complex external cavities, and pumped by powerful external lasers. Long interaction lengths are typically required and the phase mismatch between the parametric waves propagating at different velocities results in poor parametric conversion efficiencies. Here we report the demonstration of parametric oscillation in a monolithic semiconductor triple microcavity with signal, pump and idler waves propagating along the vertical direction of the nanostructure. Alternatively, signal and idler beams can also be collected at finite angles, allowing the generation of entangled photon pairs. The pump threshold intensity is low enough to envisage the realization of an all-semiconductor electrically pumped micro-parametric oscillator.     

Cavity solitons as pixels in semiconductor microcavities

Cavity solitons are localized intensity peaks that can form in a homogeneous background of radiation. They are generated by shining laser pulses into optical cavities that contain a nonlinear medium driven by a coherent field (holding beam). The ability to switch cavity solitons on and off and to control their location and motion by applying laser pulses makes them interesting as potential 'pixels' for reconfigurable arrays or all-optical processing units. Theoretical work on cavity solitons has stimulated a variety of experiments in macroscopic cavities and in systems with optical feedback. But for practical devices, it is desirable to generate cavity solitons in semiconductor structures, which would allow fast response and miniaturization. The existence of cavity solitons in semiconductor microcavities has been predicted theoretically, and precursors of cavity solitons have been observed, but clear experimental realization has been hindered by boundary-dependence of the resulting optical patterns-cavity solitons should be self-confined. Here we demonstrate the generation of cavity solitons in vertical cavity semiconductor microresonators that are electrically pumped above transparency but slightly below lasing threshold. We show that the generated optical spots can be written, erased and manipulated as objects independent of each other and of the boundary. Numerical simulations allow for a clearer interpretation of experimental results.     

High-temperature ultrafast polariton parametric amplification in semiconductor microcavities.

Cavity polaritons, the elementary optical excitations of semiconductor microcavities, may be understood as a superposition of excitons and cavity photons. Owing to their composite nature, these bosonic particles have a distinct optical response, at the same time very fast and highly nonlinear. Very efficient light amplification due to polariton-polariton parametric scattering has recently been reported in semiconductor microcavities at liquid-helium temperatures. Here we demonstrate polariton parametric amplification up to 120 K in GaAlAs-based microcavities and up to 220 K in CdTe-based microcavities. We show that the cut-off temperature for the amplification is ultimately determined by the binding energy of the exciton. A 5-micrometer-thick planar microcavity can amplify a weak light pulse more than 5,000 times. The effective gain coefficient of an equivalent homogeneous medium would be 107 cm-1. The subpicosecond duration and high efficiency of the amplification could be exploited for high-repetition all-optical microscopic switches and amplifiers. 105 polaritons occupy the same quantum state during the amplification, realizing a dynamical condensate of strongly interacting bosons which can be studied at high temperature.     

一类高品质因子大透过率二维光子晶体微腔

利用多重散射法数值模拟了多个具有五个缺陷点的氧化铝介质柱四方晶格二维光子晶体微腔的透过率T和品质因子Q. 结果表明,沿x、y方向介质柱的个数Lx、Ly以及介质柱半径r对微腔品质因子和透过率均有明显影响. 通过优化参数,实现了一类具有大透过率T、高品质因子Q的微腔. 在模拟范围内,当Lx=13、Ly=17和r=0.25时,微腔品质因子和透过率同时达到较大值,分别为49 270和91%.     

半导体的光学非线性与光学双稳

本文是对近年来光学双稳领域的进展的简介与回顾,着重介绍了解释(?)子饱和吸收和非线性色散的二能级模型,讨论了几种测量激子吸收的实验方案,并且提出了自己的实验设计方案。     

全新的光调制技术：双二进制码光调制

光纤在全球通信中运用越来越广泛，在光纤中要传输的数据量也在大量增加，怎样充分利用目前已经铺设好的光路而又要保证信号传输质量是当前光通信领域研究较多的问题．本文就此提出了一个新的光调制技术：双二进制码光调制技术，既增大了光频段的使用率同时也减少光传输中对光纤色散的依赖性，实现了数据的大容量、远距离传输．     

当代光纤和光器件技术

全光网络是当今光通信的最高形式 ,它的普及关键在器件。文章论述光网络中的全波光纤、光纤放大器、DWDM光源、全光波长转换器OTU、光开关与光路由器、光分插复用器OADM等几个核心器件当前的研究动向     

光脉冲在不连续光波导中的传播

在时域内应用慢包近似（ＳＶＢＡ）的方法，对光波导内光波传输的时域计算做了简化．应用该方法计算了不连续光波导中光脉冲的传播，得到波导不连续处的传输情况．文中应用的计算方法可以大大节省计算机的内存，节省计算时间，是进行时域计算的一种行之有效的方法     

光的Fuzzy性

用模糊逻辑推理方法，对光的波动粒子二重性进行定量和定性的综合分析．并通过对两个实验的分析描述．提出光的Ｆｕｚｚｙ性的观点，从而说明二象性是Ｆｕｚｚｙ性的具体反映．     

光物理学

本书是关于物理学的专著，这是第三版的重印版。书中既介绍了光学的基础，又介绍了现代光科学的多方面进展，还增加了若干广义光学的重要新发展。     

光开关

2001年初，本书的编辑及主要作者爱尔巴瓦帕博士，在为IEEE通讯学会筹办两个学术报告会，即ICC（国际通讯学术报告会）和GLOBECOM（全球通讯学术报告会）学术报告会的过程中，涉及光开关演示问题，于是与其他合著者一起萌发了编写此书的念头。当时电信工业包括光开关部门已处于鼎盛时期，但在2001年前它还处于空前的低潮时期。     

光学谐振腔反射特性的光外差探测

本文叙述了用位相调制光外差技术探测光学谐振腔反射特性的原理及实验结果。讨论了将该技术用于激光稳频技术时,光学谐振腔长度的计算方法。     

球锥形端面光纤在光耦合中的作用

本文叙述了球锥形端面光纤在与双异质结面发光二极管耦合中的作用。这种端面光纤与平端面光纤、球形端面光纤相比,耦合效率高,而且可扩大装配容差。具有这种形式端面的单模光纤在与光纤耦合中也能得到满意的结果。     

光学谐振腔反射特性的光外差探测

本文叙述了用位相调制光外差技术探测光学谐振腔反射特性的原理及实验结果。讨论了将该技术用于激光稳频技术时,光学谐振腔长度的计算方法。     

二芳基乙烯化合物的光学性质和光限幅效应

用Z-扫描的方法研究了新合成的一种二芳基乙烯化合物(C27H18F6S2)的光学非线性性质.测量的二芳基乙烯化合物在533nm和633nm处的非线性折射系数分别为n2=-7.69×10-6cm2/W和n2=-3.26×10-6cm2/W,非线性吸收系数分别为,β=-6.96×10-4m/W和β=-1-06×10-3m/W.研究了在大光强下折射率的横向空间分布的变化.该样品对533nm的连续光能够起到优良的光限制器的作用,其光限幅的动态范围可达287.     

旋转二次曲面光学系统的光焦度

根据光角和光焦度的定义,导出旋转二次曲面光学系统的光焦度公式,并由此推出焦距、主距等公式.     

光纤通信系统中光直接放大器的研究

随着光纤通信事业的迅速发展,人们对低噪声、高增益光直接放大器产生越来越浓厚的兴趣。本文将对半导体行波光放大器(TWA)、掺铒光纤放大器(EDFA)以及单片光电子集成光放大器等三种放大器的结构、机理、性能及应用作系统的论述。     

具有非线性周期结构光学介质的光学双稳性

应用Ｆ－Ｐ腔的简单理论，首次推导出非线性周期结构光学介质的入射光强和出射光强关系的解析表达式，并用它详细讨论了此种介质的光学双稳态的产生条件，临界入射光功率以及开关点的特性．临界入射光功率可低於１μＷ。