The relations among milo ' s frequency , output power and geometry parameters are presented . the results show that the milo ' s frequency will decrease with the increase of the size of the resonant cavity and the output power could be optimized by modifying the cavity 研究了milo工作频率和输出功率随几何结构的各个参数的相应变化规律，结果显示milo的工作频率随小谐振腔尺寸的增大而减小，输出功率具有最佳值。
In this thesis , the mechanism analysis and numerical simulation on the coupling flow field of microwave plasma within resonant cavity of mpt was discussed and the subsystem of small thrust measurement as well as the vacuum experimental study of mpt were completed 在航天飞行器上有广阔的应用前景。本论文对mpt微波等离子体耦合流场进行了机理分析和数值模拟，建立了mpt的小推力测量系统，协同进行了mpt真空环境实验研究。
The optimum position of focal spot of pumping laser through coupling system is calculated . in the fifth chapter , the optical characteristics of nd : yvo4 and lbo are studied . the astigmatism problem of resonant cavity is explored thoroughly under the condition of thermal lens effect 第五章分析了nd ： yvo _ 4和lbo晶体的光学特性，深入分析了在引入热透镜效应的情况下谐振腔的像散问题，设计了四镜z型折叠腔，应用abcd定律计算优化选择了一组腔参数。
From the resonant frequence can calculate the wave number k 0 , and we can get the r which correspond to the resonant frequence through optimize the unknown r , then we can get the result . the image part of the complex permittivity can get from the change of quality factor of the resonant cavity 由实验所测得的介质加载后的谐振频率可计算出谐振时的波数k0 ,这样就可以通过优化r的方法来寻找满足谐振频率的r 0 ,从而可以测得介质的介电常数。
A virtual cathode oscillator with an axially extracted te10 or te11 mode has been investigated using the pic code . it can emit microwaves axially through an antenna without mode converter or transition waveguide , making the system more simple and compact . the efficiency of this device can be enhanced by employing premodulation cavity , resonant cavity , feedback mechanism , and virtual cathode formed by two electron beams 本文利用物理分析和粒子模拟的方法研究了轴向提取te10 / te11模虚阴极振荡器,结果表明通过引入预调制腔、谐振腔、反馈端面、双电子束阴极等结构,可以实现结构相对紧凑、束波转换效率较高的轴向提取虚阴极振荡器。
As for the application of opo , we describe the theory of measuring mirror reflectivity by cavity - ring - down , which use the output of opo as a source , and demonstrate that cavity - ring - down is a more precise method by contrast to conventional measurements . in order to perform our experiment , we make a theroretical analyse of the experimental device , such as the laser source , resonant cavity , detector and oscillograph , and also discuss the influence of the measurement of ring - down time and the length of cavity on the experimental precision 介绍了光腔衰荡的发展历史和研究现状；对光腔衰荡测量高反率与传统测量方法进行了对比分析；从理论上分析了光腔衰荡对光源、振荡腔、探测器和示波器等实验装置的要求；对腔长和衰荡时间的测量误差对反射率测量精度的影响做了理论分析。
We use the laser output ( 320 nm , 200 fs ) of optical parametric amplifier ( opa ) in < wp = 5 > an active passive mode - locked femtosecond ti - sapphire laser operating at a repetition rate of 1khz as a exciting resource to develop optically pumped stimulated emission of zno thin films . when rectangular stripe laser irradiates thin films , optical resonant cavity is naturally formed between two nanocrystallites along with the rectangular laser stripe and planar weveguide confines the light scattering 利用飞秒激光器作为光泵浦激发光源，研究了氧化锌薄膜的光泵浦受激发射，当条形光斑辐照薄膜样品时，将沿着光斑条由氧化锌纳米晶面自然地形成光学谐振腔，由于平面介质波导结构限制光散射，所以成功地观测到二氧化硅衬底上的纳米氧化锌（ zno ）薄膜的紫外受激发射。
The resonant box effect is the most important . in chapter five , we use the experimental setup constructed and the cavity decay time method to measure the total loss of a passive resonant cavity , and analyse the experimental data in very detail . we conclude that , in present experimental conditions it is the uniformity and stability of laser mirror to confine the precision and repeatability of experimental results 第五章在建立起了连续光波时间衰减法测量装置的基础上,进行了无源谐振腔总损耗的测量,仔细分析了实验过程中的误差因素,并指出在目前的实验条件下限制测量精度和重复性的主要原因是激光镜片的均匀性和稳定性不理想。
On perturation theory resonant cavity model is built by fdtd dividing grids of resonant cavity space and solving them . on the base of the model , electromagnetic fields distribution inside and outside of resonant cavity , also noload resonance frequency and cover material ’ s influences on measurement precision are analyzed 提出了一种基于同轴谐振腔微扰原理的谐振微波传感模型,从谐振腔微扰原理出发,利用时域有限差分法( fdtd )对谐振腔空间进行网格划分并求解,建立了谐振腔传感模型。
The physical characteristic of forming plasma within resonant cavity was revealed , i . e . the forming mechanism is a switching process from the ionization caused by strong electric field at the initial stage of mpt ' s start to another ionization caused by joule ' s heat at the stage of mpt ' s steady work . the main influencing factors of mpt ' s steady work were studied . anther pointed out the matching between pressure in resonant cavity and microwave power is the determinant factor to the plasma whether stabilization or extinguishing 分析了mpt谐振腔内微波能量的转换过程，揭示了其内等离子体的形成是由mpt启动初期的强电场电离形成放电区过渡到稳定工作期的热电离形成稳态等离子体区这一物理本质；研究了影响mpt稳定工作的主要因素，指出微波有效功率与谐振腔内气体压强的匹配是维持等离子体稳定、避免等离子体消失、放电区熄灭的关键因素。
