谐振腔

The precondition to use fiber resonator to measure rotation angular velocity is to acquire high performance and stable resonance, which requires the overcome of polarization instability of fiber resonators and extremely narrow line width, tunable, high coherent light source.

用光纤谐振腔进行转动角速度测量的前提条件是要获得高性能且稳定的谐振腔，这必须解决光纤谐振腔的偏振稳定问题，同时要求有极窄线宽的可调谐高相干光源。

The tunable photon broad band radio frequency phaser based on a silicon ring resonance cavity comprises a pumping signal light-generating system, a carrier wave light-restraining double-sideband generating system, a silicon ring resonance system and a measuring system; wherein, the silicon ring resonance system comprises a light coupling device and the silicon ring resonance cavity; the output of the light coupling device is connected with the input port of the silicon ring resonance cavity; wherein, the silicon ring resonance cavity is composed of a silicon annulet and a root of a straight waveguide; the air gap distance between the silicon annulet and the root of the straight waveguide is several ten nanometers or several hundred nanometers; the taking characteristic of the silicon ring resonance cavity is the characteristic of a seasonal reject trap; the transmission rate in the position of a resonance wavelength is equal to zero or is very close to zero.

本发明包括：泵浦信号光发生系统、载波抑制光双边带产生系统，硅基环形谐振腔系统，以及测量系统。所述硅基环形谐振腔系统包括一个光耦合器和一个硅基环形谐振腔，光耦合器的输出连接到硅基环形谐振腔的输入端口，其中：硅基环形谐振腔由一个硅基微环和一根直波导构成，硅基微环和一根直波导之间的空气隙间隔为几十至几百纳米，硅基环形谐振腔频谱特征是周期性的带阻滤波特性，在谐振波长处的透射率等于0或非常接近0。

The works in the project just done can be summarized as five respects.(1) A device was designed to fabricate the asymmetrical resonant cavities by a pendant drop. A series ARCs with variable parameters provides a valuable experimental method for investigating the characteristics of ARCs.(2) The relationship between the number of active modes and the shape parameters in an ARC was investigated. The experimental lasing threshold was compared with theoretical result, the good agreement between two shown that it was the decrease of the number of active modes in an ARC that decreased lasing threshold.(3) Dye lasing gain was used to enhance the signals of stimulated Raman scattering of the weak gain Raman modes in a circular cavity made by a pendant drop, the instantaneous SRS spectra of weak gain Raman modes in ethanol was obtained by this new method.(4) The SRS signals of minority compound in a binary chemical complex was obtained by using dye lasing gain method. The detection concentration of minority compound was reduced to an order compared with normal SRS method.(5) A cylindrical circular cavity was formed by a liquid jet, which was used to reduce the pump intensity required for laser induced plasma spectroscopy. The limit of detection of trace element in aqueous sample was greatly decreased by this new method.

我们设计并成功制作了使悬垂液滴连续变形的装置，用此装置可以方便地改变非圆对称谐振腔的几何参数，为ARCs的研究提供了一种有效的实验方法；研究了ARCs中活性模式数和变形参数间的变化规律，激光阈值的数值计算结果和激光辐射的实验结果作了比较，二者吻合的曲线说明ARCs中活性模式数量的减少是受激辐射放大阈值降低的原因；在由单元化合物构成的微型圆对称谐振腔中，首次尝试用"激光增益"增强弱增益拉曼模式的受激拉曼散射信号，获得了乙醇分子中弱增益拉曼模式的瞬态SRS光谱；在由二元混合物构成的微型圆对称谐振腔中，用染料的激光增益增强了少量化合物的SRS信号，把少量化合物的SRS信号探测浓度降低了近一个数量级，在SRS应用于瞬态过程的组份分析方面做了卓有成效的探索；用石英毛细管形成的稳定液拄构成拄形谐振腔，降低了激光诱导等离子体光谱需要的激励能量，有效地降低了水相样品的痕量元素分析极限，为LIPS应用于微量元素的化学分析开拓了一条新的技术路线。

The lock in effect and threshold expressions caused by backscattering from cavity mirrors in a passive resonator gyroscopy are derived based on the resonance characteristics of cavity .

从谐振腔的谐振特性出发，严格地推导出无源谐振腔激光陀螺中由腔镜背散射引起的闭锁效应关系式及闭锁阈值表达式。

The on-line density measurement technology with microwave has been narrated as a key part. We has deduced relations between permittivity、the load Q-factor and resonant frequency. And the electromagnetic field for closed cavity 、open cavity has been analyzed. we also discuss the design of cavity that is used in experiment、means for how to stir electromagnetic wave and choice of diameter/length ratio for cavity.

接着重点说明了微波在线密度测量原理，基于麦克斯韦方程组深入推导了微扰情况下介电常数与谐振频率，有载品质因数的关系；分别讨论了封闭谐振腔和开孔谐振腔中的电磁场以及微扰方法中所使用的谐振腔的设计及设计中激励方式、腔长/半径的选择等若干关键问题。

Then the propagation of an arbitrary nonideal optical beam is analyzed. In terms of the moment theorem, the performance of modes of BOR is analyzed from both points of view of geometry optics and diffractive optics. Comparing BOR with the resonators using plane mirror and spherical mirror or using plane mirror and aspherical mirror by finite element method, the design procedure for BOR is gave.

然后以衍射的角谱理论为基础，用矩量定理讨论了任意光束的传播规律，从几何光学和衍射光学的角度完整地分析了二元光学谐振腔的模式特征，用有限元方法数值对二元光学谐振腔、非球面腔和球面腔进行衍射分析，比较了三种腔型的差异，给出了二元光学谐振腔的设计方法。

And this causes a frequency change Δf. The resonant point tracing algorithm describes how to detect Δf. So it can introduce a feedback frequencydifference -Δf through a closed loop to realize the resonant state o In the digitaldetection scenario, using staircase wave to replace saw tooth wave, it can overcome a lot of shortcomings in the analog system. The character of the staircase wave affects the detection precision directly. This thesis analyzes a high precision scenario producing a staircase waveform in detail. It can reduce the number of the bits in D/A converter greatly. This thesis proposes another method to improve the detection precision in case that the A/D converter has comparatively little number of bits, while this method will not increase the cost of the system greatly.

在谐振式光纤陀螺中，环形谐振腔的旋转使得谐振腔的谐振频率发生了变化，从而产生了一个与旋转速度成正比的频率变化值△f，谐振点跟踪算法描述了如何检测出△f，从而可以通过闭环在系统中引入反馈频差-△f，实现光路的谐振状态；在数字闭环检测方案中，用阶梯波作为反馈信号来代替锯齿波，可以克服原来模拟系统中锯齿波的很多缺点，阶梯波的性能直接影响着系统的测量精度，本论文详细分析了一种高精度阶梯波生成方案，使得所需D／A的位数大大降低；本文还分析了A／D转换器对系统测量精度的影响，提出了一种A／D转换器位数较少的情况下提高系统测量精度的措施，同时又不会增加太多的系统成本。

Adjusting insertion depth of the tuning screw pin at any moment can reach tuning effect to make waveguide device match to load of resonant cavity well in order to adapt to everchanging equivalent load of resonant cavity in course of working so as to realize real time control of energy coupling. The invention helps to increase working accuracy and efficiency of PCVD technique, and prevent damage on system device from microwave so as to raise useful service life of system. Features are: simple structure, stable performance, convenient for fabrication.

本发明通过在谐振腔设置调谐销钉，可随时调节销钉的插入深度来达到调谐的效果，能使波导装置很好地与谐振腔负载匹配，以适应加工过程中谐振腔等效负载的不断变化，实现能量耦合的实时控制；同时有助于提高PCVD工艺的加工精度和效率，避免微波对系统器件的损坏，提高等离子体谐振腔微波系统的有效使用寿命；本发明还具有结构简单，性能稳定，便于加工和制作的特点。

In the fabrication process of microdisk resonators, the SiO_2 microdisk cavity has been achieved with RIBE with 2:1 CHF_3/Ar mixture with smooth edge and vertical sidewall.

在微谐振腔制作实验中使用2∶1的CHF_3／Ar混合气体作为工作气体的RIBE制作的SiO_2微谐振腔，得到了边缘清晰、光滑，具有近似垂直侧壁的SiO_2微谐振腔腔体。

The present invention relates to a kind of tunable plasma resonant cavity for PCVD optical fiber perform rod processing machine. The tunable plasma resonant cavity includes cylindrical resonant cavity casing and cut-off waveguides set on two ends of the casing, and features the tuning piston, which is set on one end of the cylindrical resonant cavity and has middle part with through hole and back end stretched beyond the casing.

本发明涉及一种用于PCVD光纤预制棒加工机床的可调谐等离子体谐振腔，包括有圆柱型谐振腔壳体，在圆柱型谐振腔壳体的两端设置截止波导，其不同之处在于在圆柱型谐振腔腔体的一端安设调谐活塞，调谐活塞的中部开设通孔，后端延伸至圆柱型谐振腔壳体外端。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失