共查询到20条相似文献,搜索用时 15 毫秒
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Glazyrin S. I. Lykov V. A. Karpov S. A. Karlykhanov N. G. Gryaznykh D. A. Bychenkov V. Yu. 《JETP Letters》2022,116(2):83-89
JETP Letters - High gradients of electron temperature appear in plasma corona under direct laser irradiation of inertial confinement fusion targets. This results in nonlocality of heat transport.... 相似文献
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1 Introduction Inrecentyears ,aninterestingsolutionofthe paraxialwaveequation ,knownastheHermite sinusoidal Gaussian (HSG )beams,hasbeenintroducedbyCaspersonandTovar[1,2 ] .AsoneofthespecialexampleinHSGfamily ,theHermite cosh Gaussian(HChG)beams′sfielddistributi… 相似文献
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In this paper,attention is focused on the intensity moments of the Hermite-Cosh-Gaussian (HChG) laser beams from the zero-order to the fourth-order.The frequently used parameters such as the power in bucket (PIB),the beam width,the curvature radius,the far field divergence,the M2-factor,the Rayleigh length and the kurtosis are calculated in terms of the intensity moments.Figures show the influence of the mode index and the decentered parameter,which are the critical parameters of the HChG beams.Moreover,the center of the gravity of the radiation field and the symmetry are discussed along with the propagation axis.Finally,the power fraction within the beam width defined by the second moments is illustrated with numerical method. 相似文献
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We experimentally demonstrate quantum teleportation for continuous variables by using squeezed-state entanglement. A fidelity expression for a real experimental system is presented, where all the imperfection factors are considered, including losses and phase fluctuations. The measured fidelity for input coherent states is 0.62 and the prospective result with our measured entanglement and efficiencies is 0.69. We will show the details of the quantum teleportation for continuous variable and discuss the problems for further improvement in this experiment. 相似文献
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S. A. Bel’kov S. V. Bondarenko G. A. Vergunova S. G. Garanin S. Yu. Gus’kov N. N. Demchenko I. Ya. Doskoch P. A. Kuchugov N. V. Zmitrenko V. B. Rozanov R. V. Stepanov R. A. Yakhin 《Journal of Experimental and Theoretical Physics》2018,127(3):539-548
We have studied the dependence of the compression and burning of a spherical direct-drive fusion target on the nonuniformity of its heating caused by the asynchronous arrival of laser beams under conditions of irradiation by a modern laser system with a total energy of 2 MJ intended for the fuel ignition and fusion energy evolution equal to the absorbed laser energy. The investigation is performed by numerical simulation based on 2D hydrodynamic codes. It is established that the limiting permissible spread of the moments of laser pulse action on the target for ignition significantly exceeds the level that can be ensured using modern methods of controlled temporal synchronization of laser beams. 相似文献
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在Nd:YAG激光器中,用单晶硅实现了被动锁模,得到了脉冲定义为28ps左右,能量为约3μJ的锁模脉冲,并对锁模机理作了初步解释。 相似文献
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光束成丝的非线性理论 总被引:8,自引:2,他引:6
在考虑调制场和本底场之间有能量交换的情况下,研究了小尺度调制场的非线性演化过程,结果表明,受到小尺度调制的光束在传输过程中有可能经历周期性成丝过程,通过与Bespalov-Talanov(B-T)关于成丝的线性理论比较,发现B-T理论给出的最快增长频率和临界频率等结果在非线性演化过程中仍然是适用的,但其给出的调制增长纺只在调制场的初始增长阶段与本文的非线性理论一致,此后,调制场的增长速度低于指数形式的增长速率,达到某个最大值后将经历周期性变化过程。 相似文献
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一种测量光束横向尺寸的新方法 总被引:2,自引:0,他引:2
将吸收滤光片加工成柱面透置于光束束腰附近,可通过测量入射光功率和透射光功率得到以方差定义的光束横向尺寸,借助参数已知的附加透镜也能得到光束的M^2和任意轴向位置的光束横向尺寸。文中给出了测量装置参数的造反依据和误差分析。 相似文献
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We propose a scheme to achieve super-resolution of interference pattern with independent laser beams. We perform an experimental observation of a double-slit interference with two orthogonally polarized laser beams. The resolution of the interference pattern measured by a two-photon detection is doubled provided the two beams illuminate the double-slit with certain incident angles. The scheme is simple and can favour both high intensity and perfect visibility. 相似文献
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A. K. Chernyshov S. P. Kotova V. L. Velichanskii 《Journal of Russian Laser Research》2002,23(2):132-147
It is shown that the type of lateral waveguide of a laser diode cannot be determined uniquely based on just the measured magnitude of astigmatism. For a unique determination, the K-factor of Petermann, which characterizes the wavefront curvature at the laser output facet, must be measured as well. In order to determine the type of lateral waveguide, a setup for measuring astigmatic distances in the range 0–200 m with an error of ±2 m and a K-factor with an error of 20% was developed. Operational features of the setup were analyzed, and a technique that allows one to minimize the effect of beam ellipticity on the measurement results was found. Using the technique, the optimization of spatial matching of a laser diode with a ring interferometer of the butterfly type was accomplished. For transformation of the astigmatic elliptical beam into the axially symmetric mode of the interferometer, we have used an optical system that consists of two cylindrical and one spherical lenses. The algorithm for designing the matching system was developed, and the 85% injection of radiation of a AlGaAs laser diode into the principal mode of a ring interferometer was experimentally demonstrated. 相似文献
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Tan Jichun Wei Xiaofeng Cheng Zhe Yuan Xiaodong Liu Lirong Shi ZHiquan 《Chinese Journal of Lasers》1998,7(1):46-50
GeometricArangementwithMultiplicityofLaserBeamsinTargetAreaTANJichunWEIXiaofeng1)CHENGZheYUANXiaodong1)LIULirongSHIZhiquan(De... 相似文献
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用多光束干涉模拟晶格图案 总被引:2,自引:2,他引:0
利用多束激光干涉,可形成三维晶格结构,计算结果指出,用四束光或六束光可形成大部分的布拉格(Bragg)点阵。同时用He-Ne激光器获得了体心正方和面心立方的相干图案,晶格常数和计算结果相符,该研究对构成可见和红外区域的光子晶有一定意义。 相似文献