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        laser     
        相關語句
          激光
            Studying on Interaction of high intensity ultrashort pulse laser with solid-plasmas
            高強度超短脈沖激光與固體等離子體相互作用研究
        短句來源
            Ultrashort Intense Pulse Laser Propagation in Low-Density Plasmas and Air
            超短超強激光脈沖在低密度等離子體和空氣中的傳輸
        短句來源
            Study on Diagnosing the Distorted Wavefront of A Laser Beam by Radial Shearing Interferometer and Controlling It by A New Method
            激光光束波前畸變的徑向剪切干涉診斷及其控制新方法研究
        短句來源
            Dielectronic Recombination Process in Laser Produced Plasmas of (Xe,Gd,Dy,Au)
            Xe、Gd、Dy和Au激光等離子體的雙電子復合過程研究
        短句來源
            Experimental and Theoretical Research on the High Speed Flyer Driven by Laser
            激光驅動高速飛片的實驗和理論研究
        短句來源
        更多       
          激光器
            STUDY ON Ld-pumped 473nm wavelength All-solid-state blue laser
            LD泵浦的473nm波長全固體藍激光器的研究
        短句來源
            INVESTIGATION ON HIGH POWER HIGH REPETITION RATE TEA CO_2 LASER
            高功率高重復率TEA CO2激光器研究
        短句來源
            Laser-Diode Pumped Monolithic Nd~(3+):YAG Laser Passively Q-Switched By the Saturable Absorber Cr~(4+):YAG
            激光二極管泵浦Cr~(4+):YAG被動調Q的Nd~(3+):YAG微片式激光器
        短句來源
            Study on Frequency Resolved Optical Gating and LD-pumped Frequency-doubled Cr:LiSAF Laser
            頻率分辨光學快門的理論研究和LD泵浦Cr:LiSAF藍光激光器的研究
        短句來源
            Study of High Performance, High Compression Ratio Pressure Recovery System for Chemical Laser
            高性能、大壓縮比化學激光器壓力恢復系統研究
        短句來源
        更多       
          
            Selection of the value of B integal for high power laser amplifier
            高功率光放大器B積分值的選取
        短句來源
            VIBRATIONAL ENERGY TRANSFER STUDY OF DICHLOROMETHANE (CH_2Cl_2) BY LASER INDUCED FLUORESCENCE METHOD
            光誘導熒光法研究CH_2Cl_2分子的振動能量轉移
        短句來源
            LASER INDUCED ENERGY TRANSFER PROCESS IN Ba-Yb
            光誘導下Yb—Ba間的能量轉移過程
        短句來源
            New High Power TEM_(00) CW CO_2 Laser Amplifier Operated by Turbulence Flow
            湍流下運轉的新型CW CO_2單橫模高功率光放大器
        短句來源
            The Effect of NO on Laser Induced Chemical Reaction of F_(12)
            NO對CF_2Cl_2光誘導化學反應的影響
        短句來源
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          激光的
            Bioeffect of Laser
            激光的生物學效應
        短句來源
            Numerical Investigations of High-Gain Short-Wavelength Free-Electron Laser
            高增益短波長自由電子激光的數值研究
        短句來源
            ELECTRO-OPTIC FREQUENCY SHIFT OF 10.6μm CO_2 LASER LINE
            10.6μm的CO_2激光的電光頻移
        短句來源
            Tuning of a dye laser with birefringent filters
            染料激光的雙折射濾光片調諧
        短句來源
            ANALYTICAL THEORY OF STEADY CO LASER
            穩態CO激光的解析理論
        短句來源
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            laser
          Two compounds were designed, synthesized, and characterized by 1H-nuclear magnetic resonance (1H-NMR), ultraviolet (UV)-visible, and matrix-assisted laser desorption/ionization (MALDI) mass spectra.
                
          Restriction Enzyme Pattern Analysis of Mycobacteria DNA by Capillary Electrophoresis with Laser-Induced Fluorescence Detection
                
          A new method for rapidly detecting restriction enzyme patterns of Mycobacterium DNA using capillary electrophoresis with laser-induced fluorescence detection (CE-LIFD) was developed.
                
          The polymers were characterized by IR spectra, thermal-weight analysis, scanning electron microscope and laser particle size analysis.
                
          Photoinduced intramolecular electron transfer process from C60 moiety to carbazole moiety has been studied by nanosecond laser flash photolysis.
                
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          In this article the properties of resonance cavity, operating condition, and radiation output of optical pumping laser are discussed. Factors affecting the operation and the resultant emission are analysed in detail. Evaluation standard for resonance cavity and active media are described. Cavity constructions for limiting the resonance to one or several modes are suggested, hence, photon degeneracy or brightness of light flux in unit frequency range may be increased by several orders of magnitude. Experimental...

          In this article the properties of resonance cavity, operating condition, and radiation output of optical pumping laser are discussed. Factors affecting the operation and the resultant emission are analysed in detail. Evaluation standard for resonance cavity and active media are described. Cavity constructions for limiting the resonance to one or several modes are suggested, hence, photon degeneracy or brightness of light flux in unit frequency range may be increased by several orders of magnitude. Experimental results on the Ruby laser obtained in our laboratory are given. The interpretations of angular distrubution of light frequency, proposed by the auther, can be used to account for some experimental results published by recent investigertors.

          本文討論了光量子放大器的諧振腔、振蕩過程和輸出輻射的性質。討論了有關的各因素對量子放大過程及結果的影響。提出一些判斷諧振腔和工作物質優劣的判據,提出結構單波型腔的可能性,最后敘述了一個實驗結果及對它的分析,所得光的頻率角分布的結果可以解釋有關實驗結果。

          In the strong electromagnetic field of a laser beam, the third-order process of radiation with two photons absorbed and a third one emitted during a transition between energy levels of a material system may become abservable. This process has analogy with the ordinary Raman effect, in which only two photons are involved. In this paper a theoretical analysis has been given with the conclusion reached, that with a beam intensity of 0.1 MW/cm2 the vibrational Raman spectrum of molecules or crystals may be...

          In the strong electromagnetic field of a laser beam, the third-order process of radiation with two photons absorbed and a third one emitted during a transition between energy levels of a material system may become abservable. This process has analogy with the ordinary Raman effect, in which only two photons are involved. In this paper a theoretical analysis has been given with the conclusion reached, that with a beam intensity of 0.1 MW/cm2 the vibrational Raman spectrum of molecules or crystals may be obtained by the three-photon process. It is shown that this effect actually offers a new spectroscopical method. Its importance lies in the difference of the selection rule of this effect and those of the infra-red absorption and the ordinary Raman effect. It is also pointed out that the stimulated radiation of a three-photon Raman effect may be realized when pumped with a powerful laser beam.

          在laser光束的高強度電磁輻射場內,可以觀察到物質從光束吸收二個光子,同時放出一個光子,并產生能級躍遷的效應,這是一個與通常的Raman散射相類比的高階輻射過程。本文中提出了理論分析并得出這樣的結論:使用能量流密度為0.1MW/cm~2的laser光束即可方便地通過這一效應來觀測分子或晶體的振動譜。由于其選擇定則有異于紅外吸收和通常的Raman效應的選擇定則,因而提供了一個新的光譜學實驗方法,同時還指出了實現三光子Raman效應激射現象的可能性。

          The semiclassical equations which describe the behaviours of three-level lasers were derived. The method of nonlinear mechanics was used to treat the electromagnetic oscillations coupled with the dipole moments of molecules. It is shown that when the pumping power is larger than the critical value, the amplitude of output oscillations is stable (corresponding to a stable equilibrium point in phase space), only if the homogeneous line width of molecules (1/T2) is larger than the damping width of the resonan-tor...

          The semiclassical equations which describe the behaviours of three-level lasers were derived. The method of nonlinear mechanics was used to treat the electromagnetic oscillations coupled with the dipole moments of molecules. It is shown that when the pumping power is larger than the critical value, the amplitude of output oscillations is stable (corresponding to a stable equilibrium point in phase space), only if the homogeneous line width of molecules (1/T2) is larger than the damping width of the resonan-tor (q). The appearance of instability of output oscillations is due to the effect of coherence. Furthermore, a stable limit cycle was shown to appear when the above mentioned equilibrium point becomes unstable as qT2 increases. Therefore, it seems true that there is no limit cycle near the equilibrium point when it is stable. These results may account for the instability of amplitude of output oscillations observed by some authors in ruby lasers, and should be checked in detail with gas lasers.

          本文推導出描述三能級Laser工作過程的準經典方程組,并分析了輸出振動的穩定性。在閾值以上,當T_1T_2,q~(-1)時,只在1/qT_2>1時,輸出振幅是穩定的(其中T_1,T_2,q~(-1)分別是分子縱向、橫向及諧振腔的弛豫時間)。在穩定區域,趨向平衡的時間與T_1成正比。當分子線寬小于諧振腔寬度時,輸出是不穩定的,而在1/qT_2減小時,平衡點由穩定變到不穩定時產生一個穩定的極限環,即輸出振幅逐漸開始振動。 關于穩定性的結論在氣體Laser中是可以檢驗的。本文指出,在紅寶石Laser中看到的輸出不穩定,可能就是諧振腔的q很大的結果。

           
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