共查询到19条相似文献,搜索用时 93 毫秒
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介绍了原子法激光分离铀同位素的历史和现状,讨论了高激发态铀原子能级的参数(同位素移动,超精细结构、跃迁截面等)的测量和理论,强激光场中自电离态的行为,考虑了激光相干性之后的相互作用以及原子与多模激光相互作用的统计学问题等。 相似文献
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两个二能级原子与辐射场的量子动力学性质 总被引:7,自引:0,他引:7
用完全量子化方法研究两个二能级原子与腔场相互作用过程中,原子能级占居几率与辐射场的量子动力学性质,讨论了原子间耦合及激光发场对上述性质的影响,揭示了原子耦合与原子-场相互作用之间的联系。 相似文献
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利用迁移矩阵方法,给出了多体系与单模腔场相互作用的稳态解条件。在大平均光子数极限下,研究了体系的动力学特性。本文讨论了多原子-单模量子化光场的真空效应。 相似文献
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两个原子与双模腔场的多光子相互作用:场和原子的动力学性质 总被引:3,自引:1,他引:2
研究一对偶极相互作用原子与双模量子腔场的多光子相互作用,分析场和原子的动力学性质,给出腔模平均光子数和原子反转度时间演化的解析表达式,考察腔模初态、初场强度以及原子间偶极-偶极相互作用的影响。 相似文献
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光与物质的相互作用一直是科学的主旋律之一.随着超强超短激光技术的快速发展,如今人们可以研究单个原子的内部世界,并调控光与电子的相互作用,从而实现了对原子内电子的超快动力学过程的探索.强激光诱导的原子隧道电离是众多强场物理现象的基石,具有重要的研究意义,也是研究前沿的热点之一.综述了强场原子隧道电离的最新研究进展,基于隧... 相似文献
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Summary We report on calculations of differential and total ionization cross-sections of hydrogen atoms irradiated by two radiation
fields with different properties. One of the fields is of low intensity and relatively high frequency, the other is of low
frequency and high intensity. In particular, we show that the inclusion of the multimode structure of the low-frequency laser
field modifies considerably the shape of the angular distribution of the photoelectrons and the rates of ionization into the
different channels characterized by the number of low-frequency photons exchanged. Further, we find that the average energy
exchanged between the photoelectrons and the low-frequency radiation field is independent of the statistical properties of
the low-frequency laser field. 相似文献
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We have investigated quantum statistical behaviors of photons and atoms in interaction of an atomic Bose-Einstein condensate with quantized laser field. When the quantized laser field is initially prepared in a superposition state which exhibits holes in its photon-number
distribution, while the atomic field is initially in a Fock state,
it is found that there is energy exchange between photons and atoms.
For the input and output states, the photons and atoms may exhibit the
sub-Poissonian distribution. The input and output laser fields may
exhibit quadrature squeezing, but for the atomic field, only the output
state exhibits quadrature squeezing. It is shown that there exists the
violation of the Cauchy-Schwartz inequality, which means that the
correlation between photons and atoms is nonclassical. 相似文献
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YU Zhao-Xian JIAO Zhi-Yong 《理论物理通讯》2001,(10)
We have investigated quantum statistical behaviors of photons and atoms in interaction of an atomic Bose Einstein condensate with quantized laser field. When the quantized laser field is initially prepared in a superposition state which exhibits holes in its photon-number distribution, while the atomic field is initially in a Fock state, it is found that there is energy exchange between photons and atoms. For the input and output states, the photons and atoms may exhibit the sub-Poissonian distribution. The input and output laser fields may exhibit quadrature squeezing, but for the atomic field, only the output state exhibits quadrature squeezing. It is shown that there exists the violation of the Cauchy-Schwartz inequality, which means that the correlation between photons and atoms is nonclassical.`` 相似文献
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Interferometry with Ca atoms 总被引:1,自引:0,他引:1
Separated field excitation of a calcium atomic beam using four traveling laser fields represents two distinct atom interferometers utilizing the internal degrees of freedom of the atoms. Phase shifts between the atomic partial waves have been realized by phase shifts of the laser wave fields, by the ac-Stark shift, and by rotation of the interferometer (Sagnac effect). One particular interferometer can be selected by interaction of the atomic waves with extra laser fields. We furthermore report on the preparation of a laser cooled and deflected calcium atomic beam that can be utilized to largely increase the sensitivity of the interferometer. 相似文献
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Li CK Séguin FH Frenje JA Rygg JR Petrasso RD Town RP Amendt PA Hatchett SP Landen OL Mackinnon AJ Patel PK Smalyuk VA Sangster TC Knauer JP 《Physical review letters》2006,97(13):135003
Electromagnetic (E/B) fields generated by the interaction with plasmas of long-pulse, low-intensity laser beams relevant to inertial confinement fusion have been measured for the first time using novel monoenergetic proton radiography methods. High-resolution, time-gated radiography images of a plastic foil driven by a 10(14) W/cm(2) laser implied B fields of approximately 0.5 MG and E fields of approximately 1.5 x 10(8) V/m. Simulations of these experiments with LASNEX+LSP have been performed and are in overall (though not exact) agreement with the data both for field strengths and for spatial distributions; this is the first direct experimental test of the laser-generated B-field package in LASNEX. The experiments also demonstrated that laser phase plates substantially reduce medium-scale chaotic field structure. 相似文献
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We study a multimode semiconductor laser subject to moderate selective optical feedback. The steady state of the laser is destabilized by a Hopf bifurcation and exhibits a period-doubling route to chaos. We also show the existence of a heteroclinic connection between a saddle node and an unstable focus that can be associated with experimentally observed multimode low-frequency fluctuations. This heteroclinic connection coexists with a chaotic attractor resulting from the period-doubling process. 相似文献
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C. Mavroyannis 《Applied physics. B, Lasers and optics》2001,73(1):39-50
We have considered the interference spectra that occur at the three-photon generated frequency arising from the interaction
of three laser fields with a four-level atom, where two of the laser fields are on two-photon resonance with the three levels
forming a “λ” scheme while the third laser operates between the second ground and the second excited state of the atom. At
low intensities of all three laser fields, the overall intensity of the peak at the three-photon generated frequency, describing
the spectrum of an electron in the second excited state, depends on the strength of the combined field of the two laser fields
that are on two-photon resonance and it takes negative values. This indicates that light amplification without population
inversion is likely to occur at the three-photon generated frequency. The combined field of the three laser fields induces
multiphoton excitations near the three-photon generated frequency, whose peaks are characterized by linewidths which are much
less than the natural linewidths of the atoms. These excitations describe absorption or stimulating emission processes depending
on the values of the detunings of the laser fields. The derived results are graphically presented and discussed.
Received: 24 January 2001 / Published online: 8 June 2001 相似文献
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This paper investigates the squeezing properties of an atom laser
without rotating-wave approximation in the system of a binomial states
field interacting with a two-level atomic Bose--Einstein condensate.
It discusses the influences of atomic eigenfrequency, the interaction
intensity between the optical field and atoms,parameter of the binomial
states field and virtual photon field on the squeezing properties.
The results show that two quadrature components of an atom laser can be
squeezed periodically. The duration and the degree of squeezing an atom
laser have something to do with the atomic eigenfrequency and the parameter
of the binomial states field, respectively. The collapse and revival
frequency of atom laser fluctuation depends on the interaction intensity
between the optical field and atoms. The effect of the virtual photon field
deepens the depth of squeezing an atom laser. 相似文献
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We introduce a scheme for creating continuous variable entanglement between an atomic beam and an optical field, by using squeezed light to outcouple atoms from a Bose-Einstein condensate via a Raman transition. We model the full multimode dynamics of the atom laser beam and the squeezed optical field and show that, with appropriate two-photon detuning and two-photon Rabi frequency, the transmitted light is entangled in amplitude and phase with the outcoupled atom laser beam. The degree of entanglement is controllable via changes in the two-photon Rabi frequency of the outcoupling process. 相似文献