Acoustic transmission analysis on cavity resonance sound in a cylindrical cavity system: application to a Korean bell

This paper presents an analytical model for acoustic transmission characteristics of a cylindrical cavity system representing the acoustic resonance conditions of a Korean bell. The cylindrical cavity system consists of an internal cavity, a gap, an auxiliary cavity, and a rigid base. Since the internal cavity is connected to the external field through a gap, determination of the acoustic transmission characteristics becomes a coupling problem between the internal cavity and external field. The acoustic field of the internal cavity is considered by expanding the solution method of the mixed boundary problem, and the external field is addressed by modifying the radiation impedance model of a finite cylinder. The analytical model is validated by comparison with both experiment and a boundary element method. Using the analytical model, the resonance conditions are determined to maximize the resonance effect. Thus, the resonance frequencies of the bell cavity system are investigated according to the gap size and auxiliary cavity depth. By adjusting gap size or auxiliary cavity depth, the cavity resonance frequency is tuned to resonate partial tones of the bell sound. Finally, the optimal combination of gap size and auxiliary cavity depth is determined.     

Optical feedback cavity ring-down technique for accurate measurement of ultra-high reflectivity

A novel cavity ring-down (CRD) technique, based on the optical feedback effect of Fabry–Perot diode lasers, is developed for accurate reflectivity measurement of highly reflective cavity mirrors. The strong optical feedback, including the direct reflection from the front cavity mirror of a linear ring-down cavity, is re-injected into the oscillator cavity of the diode laser, and large resonant peaks are observed in the ring-down cavity output signals. The diode laser is switched off by a threshold circuit when the amplitude of a resonant peak exceeds a pre-defined threshold. Exponentially decayed signals recorded immediately after switching off the laser are used to determine the cavity decay time. The ultra-high reflectivity of cavity mirrors is measured to be 99.99606% with a reproducibility of 0.00003%. Compared with the previous phase-shift CRD technique, the signal-to-noise ratio of the cavity output signals is improved with an enhancement factor of over 100.     

Design of a higher harmonic cavity for the SSRF storage ring

Higher harmonic cavity used in the third generation synchrotron light source increases the Touschek lifetime.The higher harmonic cavity of Shanghai Synchrotron Radiation Facility(SSRF)is a 1.5 GHz passive superconducting cavity.Its higher order modes(HOM)are extracted by a ferrite HOM damper out of the cryostat.Multi-cell cavity is chosen concerning the voltage.The harmonic cavity dynamics,beam dynamics with passive harmonic cavity and the design of single cell cavity are included in this paper.     

Design of a higher harmonic cavity for the SSRF storage ring

Higher harmonic cavity used in the third generation synchrotron light source increases the Touschek lifetime. The higher harmonic cavity of Shanghai Synchrotron Radiation Facility (SSRF) is a 1.5GHz passive superconducting cavity. Its higher order modes (HOM) are extracted by a ferrite HOM damper out of the cryostat. Multi-cell cavity is chosen concerning the voltage. The harmonic cavity dynamics, beam dynamics with passive harmonic cavity and the design of single cell cavity are included in this paper.     

双光子过程耦合腔系统中光场的量子特性

本文研究了双光子过程原子与耦合腔相互作用系统中腔场的压缩效应和反聚束效应.考虑系统总激发数等于2的情况,利用数值计算方法讨论了腔场间的耦合强度变化和原子与腔场间耦合强度变化对反聚束效应的影响.研究结果表明:腔场不呈现出压缩效应;腔场的反聚束效应与原子与腔场的耦合系数之间,以及与腔场间的耦合系数之间都存在着非线性关系,     

基于宽度可调节的线缺陷平板型光子晶体的空气槽微腔

研究了一种空气槽光子晶体微腔,这种腔是由在平板型光子晶体上引入一条宽度可以调节的线缺陷空气槽形成的,腔模的电场被强烈局限在空气槽中,由于介电常量的不连续性,电场得到很大的提高,同时模体积被大大地降低.数值模拟与分析了微腔的能带结构和场分布,考虑到腔模的谐振频率和对称性,发现一阶偶膜同时具有较高的品质因子和较小的模体积;应用有限时域差分法,得到腔模的品质因子可以高达106,模体积仅为0.02(λ/n)3.计算了一阶偶模谐振波长随空气槽宽度以及空气孔半径的变化,发现随着宽度的增加,波长越来越短.而随着空气孔半径的增加,波长近似线性地减小;当空气孔半径为170 nm时,可以获得最高的腔品质因子.     

基于宽度可调节的线缺陷平板型光子晶体的空气槽微腔

研究了一种空气槽光子晶体微腔,这种腔是由在平板型光子晶体上引入一条宽度可以调节的线缺陷空气槽形成的.腔模的电场被强烈局限在空气槽中,由于介电常量的不连续性,电场得到很大的提高,同时模体积被大大地降低.数值模拟与分析了微腔的能带结构和场分布,考虑到腔模的谐振频率和对称性,发现一阶偶膜同时具有较高的品质因子和较小的模体积;应用有限时域差分法,得到腔模的品质因子可以高达10⁶,模体积仅为0.02(λ/n)³.计算了一阶偶模谐振波长随空气槽宽度以及空气孔半径的变化,发现随着宽度的增加,波长越来越短.而随着空气孔半径的增加,波长近似线性地减小;当空气孔半径为170 nm时,可以获得最高的腔品质因子.     

Fano interference and transparency in a waveguide-nanocavity hybrid system with an auxiliary cavity

We investigate theoretically single photon transport in one-dimensional waveguide coupled to a pair of cavities, which are denoted by the first cavity and the auxiliary cavity. Two cases with no atom and one atom embedded in the first cavity are discussed. The Fano dips in the transmission spectrum and locations of transparency window are calculated. When no atom is embedded in the first cavity, there exists a transparency window under the condition that the first cavity and the auxiliary cavity are not resonant. The locations of the transparency window and Fano line type depend strongly on the eigen frequency of the auxiliary cavity and the coupling strength between the auxiliary cavity and the waveguide. When one atom is embedded in the first cavity, we show that the transparency window exists even though the first cavity, the atom and the auxiliary cavity are resonant. The Fano line type is strongly dependent on the eigen frequency of the auxiliary cavity and the coupling strength. Our results have potential applications in design of quantum devices at the level of single photon,such as single photon switch and single photon routers.     

用光腔衰荡技术测量镜片的反射率

 根据光腔衰荡光谱技术原理,建立了测量镜片反射率的实验装置。利用该装置测定了一对反射率相等的高反射腔镜,反射率测试结果为（99.925±0.001）%;以22.5°将直腔变为折叠腔,测得的反射率为（99.992±0.003）％。重复测定反射镜样品的反射率,精度达到10^－5。该测量装置可用于超低损耗薄膜高反射镜反射率的精确测量。轻微移动探测器位置,对腔镜的测试结果影响不大。     

Implementation of Deutsch-Jozsa Algorithm with Superconducting Quantum-Interference Devices via Raman Transition

In this paper, a theoretical scheme is proposed to implement the Deutsch-Jozsa algorithm with SQUIDs (superconducting quantum-interference devices) in cavity via Raman transition. The scheme only requires a quantized cavity field and classical microwave pulses. In this scheme, no transfer of quantum information between the SQUIDs and the cavity is required, the cavity field is only virtually excited and thus the cavity decay is suppressed.     

一种220 GHz分布作用速调管的高频系统模拟

对一种基于双排矩形波导慢波结构(SDRWS) 结构的3腔EIK进行了详细计算机模拟计算, 通过对基于SDRWS结构的EIK用输入输出腔的S11的模拟计算及对分布作用速调管用中间腔的本征频率的模拟计算, 初步确定了EIK用输入输出腔及中间腔的结构参数, 进而对EIK进行了PIC互作用模拟计算, 结果表明: 该EIK的3dB工作频带为219.5~220.5GHz, 3dB带宽为1GHz, 最大功率为456 W, 最大增益为40.06dB。在此基础上, 通过调整中间腔的波导头宽度以进行参差调谐, 用PIC互作用模型模拟计算研究了中间腔谐振频率对EIK整体性能的影响。结果表明, EIK的3dB工作频带主要由输入输出腔的通频带决定, 而中间腔的谐振频率也具有重要影响。当中间腔的谐振频率分别处于输入输出腔的通频带的低频端或高频端时, 可以使EIK的3dB工作频带向低频端或高频端得到一定程度展宽; 当中间腔的谐振频率高于输入输出腔的通频带的高频端时, EIK的增益在其3dB工作频带内较为平坦, EIK的输出信号在其3dB工作频带内比较稳定, 频谱的纯净程度较好。参差调谐的最终结果表明, 当中间腔的波导头宽度为0.747mm时, EIK获得了接近最优的性能, 3dB工作频带为219.5~220.0GHz, 3dB带宽扩展到1.2GHz, 最大功率为630W, 相应的最大电子效率为11.3%, 最大增益为47dB。     

水下超声速气体射流诱导尾空泡实验研究

两相射流与空化问题对采用喷气推进的水下高速运载器而言不可避免.本文通过水洞实验,探究了回转体在水流场中由亚声速及超声速气体射流诱导形成尾空泡的形态特征,发现了四种不同类型的诱导尾空泡,并探讨了相应的形成机理和控制条件.通过高速图像采集及数字处理技术,得到了不同弗劳德数和通气流量系数下诱导尾空泡的瞬时及时间平均形态.通过气体射流数值解及射流耦合空泡闭合理论模型与实验图像的对比分析,得到如下结论:根据形态特征,将观察到的射流诱导尾空泡划分为泡沫状、完整、部分破碎和脉动泡沫状四类,其中诱导产生的部分破碎尾空泡在形态上与超空泡存在明显差异,脉动泡沫状则为诱导空泡所特有;气体射流受到空泡阻挡发生回射后对应的实际通气流量系数是控制空泡形态的关键;诱导空泡类型转变可以通过Paryshev提出的射流空泡耦合模型预测,但必须在考虑射流空间结构和流动损失的前提下;进行上述修正后,诱导尾空泡形态变化规律与理论模型估算得到的实际流量系数相符合.     

太阳光抽运激光器抽运系统优化

太阳光抽运激光器中,抽运系统提供的太阳抽运光与激活晶体之间的耦合决定了激光输出的总体效率。使用Tracepro软件,建立了菲涅耳透镜、锥形抽运腔二级抽运系统模型,并对该系统进行优化。通过分析菲涅耳透镜焦斑能量沿轴线的分布,得到了锥形腔入射窗口的口径和窗口距菲涅耳透镜的距离。通过改变锥形抽运腔的腔长和锥度,分析晶体棒轴向抽运功率密度分布,得到了锥形腔的最佳结构,并对镜面反射腔和陶瓷腔进行了详细的介绍。     

双反馈半导体激光器的混沌特性研究

实验利用双反馈半导体激光器获得了关联维数为3.8的高维混沌光.同时对比分析了双反馈与单反馈两种不同模式产生混沌的区别.结果表明：在反馈强度均为-26 dB时,双反馈产生混沌的关联维数高于单反馈产生混沌的关联维数2.6;双反馈可获得带宽为11 GHz的混沌光,为单反馈产生混沌带宽5.5 GHz的两倍.当双反馈的两个外腔长度不相等时,混沌的自相关曲线能很好的隐藏外腔长度信息,可提高混沌通信的保密性. 关键词： 双反馈 半导体激光器 混沌 带宽     

STRUCTURE-MODIFIED INFLUENCE ON THE INTERIOR SOUND FIELD AND ACOUSTIC SHAPE SENSITIVITY ANALYSIS

The covering-domain method is adopted to calculate first the interior sound field of a complex-shaped cavity stiffened with stringers, then the influence of an appended mass on the complex cavity wall is further analyzed based on the covering-domain method. Besides, the method is applied to analyze acoustic shape sensitivity of complex-shaped cavity. Combining a specific cavity, we calculate the corresponding acoustic shape sensitivity when every dimension of the cavity varies respectively. This will provide theoretical instruction for dynamic structural modification of the complex-shaped cavity.     

Generation of a four-atom entangled cluster state in cavity QED

We propose a method of generating a four-atom entangled cluster state by considering two kinds of the atoms–cavity field interaction in cavity QED. During the preparation the cavity is only virtually excited no quantum information will be transferred from the atoms to the cavity and thus the scheme is insensitive to the cavity field states and cavity decay. The scheme can also be used to generate the cluster state for the trapped ions.     

Implementation of a Two-Atom √swap Gate in Cavity QED

We implement a two-atom √swap Bate via cavity QED. During the preparation, a cavity-assisted collision betweenatoms is required, and this does not need any auxiliary atom. The cavity is only virtually excited, thus our scheme is insensitive to the cavity field states and to the cavity decay. The scheme can be implemented by the present cavity QED techniques.     

耦合孔对微波腔的影响研究

从Maxwell方程出发,将微波腔中的实际微波场按其本征模式展开,进行微波腔的工作特性(如工作频率、场分布等)的研究.在具体处理过程中,根据复杂结构微波腔的具体边界,将微波腔分成规则形状微波腔和非规则(含耦合孔)部分,建立实际微波腔模式同规则形状微波腔模式之间的场耦合方程,从而确定耦合孔对微波腔模式的影响,并对开耦合孔的圆柱腔进行了相应的理论和模拟研究. 关键词： 微波腔 模式 场耦合 圆柱微波腔     

Woodpile结构三维光子晶体中的四端口通道下载滤波器

基于三维光子晶体空间完全带隙的特性,本文在实验上构建了一种由非共面的两个波导和一个立体微腔组成的四端口通道下载滤波器。讨论了球体、正方体、长方体微腔滤波器的选频特性,以及连续旋转长方体微腔时,其输出频率的变化。研究结果表明,无论是对称型还是非对称型微腔,都可以较好地实现选频。提高微腔的不对称性,共振输出频率随之发生移动,说明改变微腔的对称性,可以有效调节滤波器的选频特性。连续旋转非对称型长方体微腔,输出频率会随之发生明显的移动,如果引入有效调节机制,可以产生连续调节输出频率的效果。该研究结果给多端口选择性输出空间滤波器的设计提供了新的思路,为光学器件集成化的设计提供了重要的理论参考。     

新型跑道腔式束流位置监测器

系统提出了一种新的腔式束流位置监测器(BPM),即跑道型腔式BPM,并使用微波工作室软件进行了理论研究和模拟计算,提出了通用设计方法。跑道型腔式BPM的金属腔部分具有跑道形横截面,引出束流位置偏移激励起的一对偶极模式作为束流位置信号。该方案的偶极模式极化方向固定,频率分离,可以解决随机误差产生的横向串扰问题,其理论位置分辨力可以达到15 nm。