quasi crystal 中文意思是什麼
quasi crystal
解釋
及其它準晶格-
Abstract : we have studied the spontaneous emission from a three - level atom with an external - driving field in a photonic crystal. as a result of quantum interference and photon localization, the population in the two upper levels displays quasi - oscillatory oroscillatory behavior. this depends on the initial atomic state and the relative positions of the two upper levels from the forbidden gap. the intensity and the phase of the external field can affect spontaneous emission from the atom. the properties are different from a three - level atom either in vacuum or in aphotonic crystal without an external driving field
文摘:討論了在雙光子驅動場作用下，三能級原子在光子晶體中的自發發射問題.由於量子干涉和光的局域化作用，兩個上能級中的占據數將具有周期振蕩或準周期振蕩的性質，這不僅依賴于兩個上能級與禁帶的相對位置，同時也依賴于原子的初始狀態，而且還與驅動場的強度、驅動場的入射位相有關.這些性質既與真空中帶有驅動場的原子的自發發射性質不同，也有別于無驅動場作用下光子晶體中三能級原子的自發發射性質 -
And then the theoretic technique of import the periodically wave of periodically poled crystals in the process of opo was studied, the theoretical method was realized by using period poled crystal in quasi - phase - matched optical parametric oscillation
研究了將周期極化晶體的周期波矢引入光學參量振蕩過程，利用周期極化晶體實現準相位匹配光學參量振蕩的理論方法。 -
The analyses given in this paper to quasi - three - level for 946 nm laser are complete. the relation between 946 nm laser transmission and optimal crystal length has been derived from the rate equations describing the population inversion and the photon density in the laser cavity in the steady - state case. the minimal claims to coating have been given on the base of contrasting 946 nm transmission with 1064 nm transmission in the condition of different cavity losses and how the pump beam radius in the laser crystal and optimal crystal length affect the laser threshold and output power of 946 nm laser has been given as well
對產生946nm譜線的準三能級結構給出了較為完整的分析，利用激光諧振腔處于穩態時的速率方程，導出了準三能級nd ： yag946nm起振時，透射損耗與最佳激光晶體長度的關系，在與1064nm透射損耗相比較的基礎上，給出了不同的腔損耗情況下的最低鍍膜要求，並且給出了激光閾值、輸出功率和最佳激光晶體長度及泵光光斑大小的關系，這為設計室溫下高效運轉的946nm激光器的提供了理論基礎，這種分析方法對研究此類低增益，準三能級或三能級激光系統輸出特性有借鑒意義。 -
The optimal length of crystal was achieved for the characteristics of quasi - three - level. three types of crystal were compared, we select lbo as the main frequency doubler. meanwhile, the other strong spectrum were restrained by suitable coating
從激光晶體的準三能級特性出發，充分考慮增益與損耗之間的矛盾，選擇出最佳晶體長度；對三種倍頻晶體進行了比較，選擇出lbo作為主要倍頻晶體；對膜系進行了必要的分析，在維持946nm譜線振蕩的同時，充分考慮了其它激光譜線的抑制。 -
The theory of optical interference is analyzed, the measurement of small out - of - plane vibrations in quasi real time using a photorefractive crystal as a medium for recording interference fringes is discussed
摘要利用光的干涉原理，分析了應用光折變晶體記錄干涉條紋在準實時、離面小振幅振動時的測量方法，並給出了計算機模擬結果。 -
In this thesis, we study the nonlinear effects in electron - phonon interaction of one or quasi - one dimensional system with the nonlinearity of phonon ( lattice ). using the variational method and coherent method we study the ground state properties of one - dimensional molecular crystal and the soliton characteristics in protein molecular chain, respectively
本文以較簡單的一維（或準一維）電子-聲子耦合系統為對象，在計入聲子（晶格）非線性的條件下，分別採用變分法和量子相干態方法研究了一維分子晶體基態的性質和蛋白質分子鏈中孤立子特性。 -
The quasi - chemical equilibrium for cdte and znte were inspected independently while the influences of the integration crystal lattice were taken into consideration by the united concentration of vacancies, anti - sites, and the cation interstitials
將（ cd ， zn ） te視為替代型晶格點陣，獨立地考察其中cdte和znte的偽化學平衡。同時，通過統一的空位、反位原子及陰離子間隙原子濃度來反映整體晶格環境的影響。 -
Study of the band gap and polarization properties of 1d photonic crystal with a quasi - periodic structrue
準周期結構一維光子晶體的帶隙結構及偏振特性 -
Colloidal amorphous crystal with a quasi - complete photonic band gap
準完全帶隙膠體非晶光子晶體
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