激子密度 的英文怎麼說

中文拼音 [jīzimìdù]
激子密度 英文
exciton density
  • 激 : Ⅰ動詞1 （水因受到阻礙或震蕩而向上涌） swash; surge; dash 2 （冷水突然刺激身體使得病） fall ill fr...
  • 子 : 子Ⅰ名詞1 （兒子） son 2 （人的通稱） person 3 （古代特指有學問的男人） ancient title of respect f...
  • 密 : Ⅰ名詞1 （秘密） secret 2 [紡織] （密度） density 3 （姓氏） a surname Ⅱ形容詞1 （距離近; 空隙小）...
  • 度 : 度動詞[書面語] （推測; 估計） surmise; estimate
  1. Based on the diopter status of myopia and hypermetropia, the paper presented the principle of excimer laser refractive surgery, the change of impacting cornea curvature on the cornea diopter. in this chapter, we also discussed excimer laser - corneal tissue interactions and photoablation. determine the relationship between the fluence of arf excimer laser and the cornea ablation rate, attain the relationship between the energy density and the ablation depth

    研究了激光與生物組織相互作用、光蝕作用及準分子激光消融角膜的機理；首次定量研究193nm準分子激光高斯光束的切削量與能量密度的關系，計算單個激光脈沖角膜切削量；發現了角膜曲率對切削效果的影響，首次提出了角膜曲率半徑、切削位置與切削深度的關系；首次定量確定了激光光斑參數及其排列方式對術后角膜表面粗糙度的影響，為更精確實現角膜切削和提高切削后角膜表面光潔度、減少手術后角膜渾濁及角膜表面術后不規則提供了理論依據。
  2. We have calculated one - and two - photon absorption cross sections of the lowest excited states of a series of molecules combined with benzene, stilben, thiophene as center attached with amine, diphenylamine, diethylamine as electron - donor and nitryl as electron - acceptor ; the effects of molecular length, n center and electron - donor on two - photon absorption cross sections have been studied and all calculations have been carried out using the density functional theory at an ab initio level. it is found that the molecular length and the one - photon absorption intensity are quite strongly c orrelated factors, and that a corresponding correlation for the two - photon absorption is decreasing. it is also found that a most crucial role for the two - photon absorption is played by the n center

    我們分別以苯、二苯乙烯、噻吩為中心，氨基、二苯氨基和二乙氨基為電子給體，硝基為電子受體組合形成的分子為研究對象，在從頭計算的水平上用密度泛函理論計算了這些分子在低激發態下的單、雙光子吸收強度，重點研究了分子的長度、中心和給體的供電子能力對分子單、雙光子吸收的影響。研究結果表明，分子長度與單光子吸收強度之間有密切關系，而在雙光子吸收中這種關系較弱；中心在雙光子吸收中具有重要的作用；在中心和受體一定的情況下，增加給體的供電子能力，可提高雙光子吸收強度。
  3. Some by - products of this work can be used as routine tools in the uv laser laboratory. commercial video ccd cameras are used to image uv laser and soft x rays, window glass as a fluorescer is used to indirectly measure the uv laser beam profile with high energy density, and a special glass which permits uv light to pass through while absorbs the visible, is introduced into the uv beam profiling in strong visible stray light environment

    實驗中發展了一些測量技術，例如用可見光視頻ccd直接測量紫外激光的光束分佈和激光等離子體產生的x光二維圖象，利用窗玻璃作為熒光體測量能量密度較高的紫外光束分佈，利用可見吸收紫外透射玻璃製成的衰減器測量有嚴重背景光的紫外光束分佈，可以作為實驗室的常規測量工具，並有一定的推廣價值。
  4. The high - power semiconductor quantum well ( qw ) laser is a kind of luminescence device with superior performance, it has longe - lived, low threshold current density, high efficiency, high luminosity and excellent monochromatic, coherence, directionality, etc. the high - power semiconductor laser is widely applied to the fields, such as military, industrial machining, communication, information processing, medical treatment, etc. the material ' s epitaxy is the foundation of the whole laser ' s fabricating, and it has important influence on the optics and electricity performance about the laser

    大功率半導體量子阱激光器是一種性能優越的發光器件，具有壽命長、閾值電流密度低、效率高、亮度高以及良好的單色性、相干性、方向性等特點，廣泛應用於軍事、工業加工、通信及信息處理、醫療保健等領域。材料的外延生長是整個激光器器件製作的基礎，對器件的光學和電學性能有著重要的影響，生長不出優質的材料體系，獲得高性能的器件就無從談起，因此，材料的外延生長便成為了整個半導體激光器製作過程之中的重中之重。
  5. Using different combinations of the nucleon density distributions of the ground state of 6he and the second excited state of 6li with and without the halo, we have calculated the microscopic optical potentials of the input and output channels, and, with these potentials, calculated the angular distribution of the " h ( he, li ) n reaction populating the second excited states of 6li by using a dwba code

    我們用假定的~ 6he基態和~ 6li第二激發態有暈和無暈的各種核子密度分佈的組合分別計算了入射道和出射道的微觀光學勢並將其輸入通用的dwba核反應程序計算了~ 1h （ ~ 6he ， ~ 6li ） n反應布居~ 6li第二激發態的角分佈。
  6. A co2 laser with the optimized resonator is made and to be proved by experiments. this dissertation focus on the following problems : the kinetics process of the cvl and the co2 laser, the rate equations for the laser level population, electron temperature and electron density

    本文的重點是：闡述清楚銅蒸汽激光和二氧化碳激光的動力學過程，定量描述激光能級的粒子數速率方程、電子溫度和電子密度等速率方程
  7. Electron density is one of basic parameters of laser - produced plasma, so it has a important role in diagnosis of laser - produced plasma

    電子密度是激光等離子體最重要的基本參數之一，因此在激光等離子體診斷中佔有重要位置。
  8. In this technique, the particle density in the beam is very low ( typically 105 thickness ), so perturbations from collisions and inter - ionic fields are absent

    而且離子密度低（一般密度為10 ~ 5 cm ~ 3 ） ，因此不會出現自吸收、碰撞退激發以及離子間場效應等現象。
  9. A monte carlo algorithm was presented to model the relation between the scattering phenomenon, depolarization changes and sea water depth, it is discovered that the radius of scattering point and the degree of depolarization increase with increasing of the sea water depth. at last, a optical engineering software ( lighttools ) is introduced to simulate optical scattering in the deep sea water, and studys the corelation between scattering and relative refractive index, particle density and particle size in the sea water. the experiment results show that the intensity of scattering will increase evidently with the increasing of particle size, particle density and relative refractive index. the methods and results in the article provide the basic theory and experiment validation for improving performance of communication, detection and imaging under sea water

    本文以球形粒子的mie散射理論、 stokes矢量法以及mueller矩陣來研究海水的散射特性和散射中的退偏振度變化;通過montecarlo方法模擬藍綠激光在海水傳輸過程中的散射現象以及散射中的退偏度變化與海水深度的關系，發現隨著海水深度的增加，散射后的光斑半徑、退偏振度將逐漸增大。最後通過光學工程軟體（ lighttools ）對海水中的散射進行模擬實驗，研究散射與海水中粒子密度、粒子大小和相對折射率的關系。實驗結果表明，隨著粒子半徑、粒子密度和相對折射率的增加，散射的強度將顯著增加。
  10. Numerical simulations were done to show the distortion of the wavefront and the interference pattern under several kinds of typical plasma density distributions. the ray path in plasma was calculated by the numerical solution of the vector equation of light ray, when the plasma density was closing to the critical electron density of the laser frequency. through the simulations, the factors that influence the measurement were found out under different density distributions and shapes of plasma

    在此基礎上，採用數值模擬的方法，計算了在幾種典型的等離子體密度分佈下，激光波面的變化和產生的干涉圖樣；並用光線矢量微分方程的數值解法計算了當等離子體密度接近光頻臨界電子密度時，光線在等離子體中的傳播路徑，從中掌握了在不同的等離子體密度和形狀下，進行干涉測量所應估計到的因素。
  11. Through the research of nonlinear phenomenon in the dense particles field, the understand of the study on characters of nonlinear exposure in in - line holography for particle field was all - round

    發現粒子密度越大，中心粒子發生邊緣剪切越嚴重。這使對粒子場激光同軸全息非線性曝光特性有了更加深入的認識。
  12. The output spot - size of our non - flowing tea co2 laser is quite large, only slightly smaller than the section of the excited media, this agrees with the calculated spatial distributions of the initial electron density for pre - ionization well

    由我們的非流動型teaco _ 2激光器獲得的輸出光斑相當大，僅比激活區截面略小，這與理論計算的預電離初始電子密度空間分佈規律有較好的一致性。
  13. The main results are as follows : 1. the propagation of an ultrashort intense pulse laser beam in low - density plasmas is investigated analytically. relativitistic pondermotive force and space - charge effects are included, and an equation describing the evolution of the laser spot size is derived

    考慮有質動力與電荷分離場的平衡，推出了超短超強脈沖激光在低密度等離子體中的折射率、電子密度和電荷分離場的表達式以及激光束斑的演化方程。
  14. Abstract : this paper describes the thermal effects of a coaxial rf - excitedco2 laser ， based on the balance equations of electron density and energy ， current continuity equation ， and heat conduction equation. depende ncies of the spatial distributions of gas temperature on some discharge parameters arediscussed

    文摘:通過求解放電等離子體中的帶電粒子密度和能量的平衡方程、電流連續性方程以及熱傳導方程，研究了同軸射頻（ rf ）激勵co2激光器中放電混合氣體的溫度效應，分析了有關放電參數對溫度分佈的影響。
  15. The equivalent cavity model is used to deduce the threshold condition of the ecld, and the expression of the threshold carrier density n ( v ) when ecld is tuned to oscillate at different frequencies has been obtained. using the expression of n ( v ) and the carrier dependent refractive index, the simple basic equation describing the bistable characteristics has been derived after choosing an appropriate reference frequency nf

    通過建立等效腔模型來推導外腔半導體激光器的閾值條件，得到ecld在不同頻率v振蕩所需的閾值載流子密度n （ v ）表達式，利用該表達式及相關的折射率表達式，在選擇合適的參考載流子密度n _ f后，導出了一個描述雙穩所需的基本方程。
  16. We then discuss the vibrational - rotational level transitions and the population rate equations for the laser. in addition, electron temperature, electron density and the mixtured gas temperature in the laser plasma are investigated in details. the third part is with regard to the optimal designs and the experiments of the lasers

    在二氧化碳激光動力學機理的研究中，比較詳細地討論了二氧化碳激光動力學過程，給出了激光振動-轉動能級躍遷及其速率方程、激光等離子體電子密度和電子溫度，以及混合氣體的氣體溫度
  17. The intracavity photon density and initial population inversion density are assumed to be gaussian distributions instead of plan wave assumption, based on this assumption, the rate equations of diode - pumped intracavity - frequency - doubled passively q - switched laser are modified. through solving these space - dependent rate equations numerically, the results under different assumption are compared. 5

    將腔內光子密度和初始反轉粒子數的平面波近似修正為高斯分佈近似，獨立地導出描述二極體泵浦內腔倍頻-被動調q激光器的速率方程，並通過數值求解該方程比較了兩種近似下脈沖特性的不同； 5 .實驗驗證了2中提出的實驗方案，並對實驗結果進行了分析。
  18. At the same time, the paper give out the investigation of x - ray interferometry in diagnostics of the electron density of laser produced plasma, and derived a modified term for wkbj solutions. at last, we proved these by numerical simulation

    接著，本文給出了x射線激光干涉法在激光等離子體電子密度診斷中的理論研究，給出了對原有干涉法理論修正，並用數值計算中加以了驗證。
  19. Because quasi - fermi levels of a laser diode ( ld ) vary with the carrier density, it is predicted that a new type of hysteresis loop should occur for the current passing ld while a hysteresis loop appears on the power - frequency curve of the ecld. an explicit analytical expression for the frequency width of the hysteresis loop and the condition for the formation of the hysreresis loop has been deduced

    預測了由於半導體激光二極體（ ld ）的準費米能級之差隨ld內線流子密度的變化而變化，因而，在調諧外腔半導體激光器的輸出功率?振蕩頻率曲線上出現雙穩環的時候，通過ld的電流也應出現一個伴隨的新型雙穩環? ?電流雙穩環。
  20. We have designed a set of ultraviolet probe and holographic interferometer system on " xg - ? " laser facility, where probe wavelength can be short as 0. 308nm. igoring effect of magnetic field, electron density can be measuremented exactly. in this paper, holographic interferometry is interpreted in detail and and the experimental results are presented and analysed

    我們在「星光」裝置上設計了一套紫外超短脈沖激光探針及其全息干涉系統，該系統探針光波長可以短到0 . 308nm ，在這樣的情況下忽略磁場效應可以比較精確地測量等離子體冕區（ 0 . 1n _ o ）電子密度。
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