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分析了三能级原子系统对激光脉冲的响应。由此导出了双光子三能级光子回波形成条件。在实验上观察到这种新的光子回波,并用其测量了|32D>+|32P3/2>Na和Ar的碰撞截面。
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高亮度的激光钠信标有利于提高自适应光学波前探测的准确性和灵敏度,但是在激光与钠原子作用的过程中,反冲和下抽运限制了钠原子激发态概率的增长,减小了钠原子的自发辐射速率和回波光子数。通过对窄带/宽带激光与钠原子作用产生反冲和下抽运效应的研究,结果表明:对于低能量的连续激光与大气中间层钠层作用,窄带激光反冲和下抽运效应比宽带激光严重,但是自发辐射速率比宽带激光大很多,获得的回波光子数明显多于宽带激光;对于宽带激光,其激发的回波光子数较少,但是具有不易饱和、反冲效应小的优点。 相似文献
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A型原子与单模光场的非共振作用制备四光子相干态 总被引:2,自引:2,他引:0
根据简并A型三能级原子与单模光场的改进型有效哈密顿量,通过矩阵形式法推导出原子-光场系统的波函数,提出利用简并A型三能级原子与单模光场的远离共振相互作用制备四光子相干态的有效方案。并且证明按照同样的方法不能制备出四成分以上的相干叠加态,即当在腔中注入的第三个原子的速度与第二个原子的速度相等时,腔场将保持这种四光子相干叠加态不变。 相似文献
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研究了Kerr介质腔中非关联双模热光场与V型三能级原子相互作用过程中的场关联特性.通过数值计算和图形分析,讨论了平均光子数、Kerr介质、失谐量以及耦合系数对场的关联特性的影响.结果发现:当V型三能级原子与两模光场发生相互作用时,非关联双模热光场将发生关联,且关联强度与耦合强度、失谐量和Kerr系数有关.当两模热光场和裸原子发生对称相互作用时,两模光场始终处于正关联;增加一模光场的平均光子数,两模光场的关联减弱;Kerr介质和失谐量的增加将削弱两模场的关联;当两模光场与原子发生不对称相互作用时,假设g1>g2,两模光场的关联特性在正关联和反关联之间交替出现.保持场一模的平均光子数不变,增加场另一模的平均光子数,反关联特性消失. 相似文献
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We experimentally demonstrate cavity linewidth control by manipulating dispersion of the intracavity medium. By making use of the dramatic change of Kerr nonlinearity near electromagnetically induced transparency resonance in a three-level atomic system, the cavity transmission linewidth can be greatly modified. As the cavity input intensity increases, the cavity linewidth changes from below to above empty cavity linewidth, corresponding to subluminal and superluminal photon propagation in the cavity, respectively. 相似文献
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A. M. Basharov N. V. Znamenskii A. Yu. Shashkov 《Bulletin of the Russian Academy of Sciences: Physics》2008,72(5):670-672
The superradiance, photon echo, and coherence transformation in three-level cascade-type atoms have been theoretically investigated for the case where the frequency of an optically allowed transition from the upper level coincides with the cavity frequency. 相似文献
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We report on the first observation of stimulated Raman scattering from a Lambda-type three-level atom, where the stimulation is realized by the vacuum field of a high-finesse optical cavity. The scheme produces one intracavity photon by means of an adiabatic passage technique based on a counterintuitive interaction sequence between pump laser and cavity field. This photon leaves the cavity through the less-reflecting mirror. The emission rate shows a characteristic dependence on the cavity and pump detuning, and the observed spectra have a subnatural linewidth. The results are in excellent agreement with numerical simulations. 相似文献
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We show that rare-earth (RE-) doped glasses can have homogeneous linewidths as narrow as 287 kHz at (4)He temperatures. This is far narrower than others reported in glasses in the same temperature range and is suitable for precise spectral hole burning and spatial-spectral holographic applications. It is known that cw spectral hole burning linewidth measurements of RE ions in glasses are hindered by the presence of spectral diffusion but, even in glasses, application of a magnetic field can freeze out RE spin-spin interactions responsible for spectral diffusion and isolate the remaining contribution of two-level systems (TLSs). The Er(3+):2G2S glasses have unusually low TLS contributions, making it possible to study the real homogeneous linewidth using photon echo measurements. The contribution from TLSs is only 170 T(1.3) kHz when subjected to a field of 5 T. 相似文献
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We investigate the formation of stimulated photon echo in a three-level system in the presence of spatially inhomogeneous external electric fields. We show the possibility of controlling stimulated photon-echo response time in the nano-temporal range. 相似文献
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The correlation of inhomogeneous broadening at various frequency transitions in three-level systems is investigated, as is its effect on the intensity of a stimulated photon echo. It is shown that the correlation coefficient of inhomogeneous broadening at two different transitions and the response intensity of the stimulated photon echo depend on the parameter of the random interaction of an optical electron with a local field, as well as on the distribution width of additional frequency shifts owing to a partial fixation of transition energies. In this case, an insignificant variation of the correlation coefficient results in a considerable decrease in the response intensity. 相似文献
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I. I. Popov N. S. Vashurin S. E. Putilin A. U. Bahodurov 《Bulletin of the Russian Academy of Sciences: Physics》2017,81(5):551-553
A textured three-layer ZnO/Si(P)/Si(B) film in an uniform longitudinal magnetic field with a stregth of 0.4 T exhibits the effect of the polarization plane’s rotation from a stimulated photon echo signal formed at room temperature on the exciton states. At time interval τ12 set to zero and time interval τ23 = 720 and 900 fs, the angles of rotation are 27° and 19°, respectively. 相似文献
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S.A. Moiseev 《Hyperfine Interactions》1997,107(1-4):345-357
The single-photon echo (SP-echo) effect is predicted to appear in the case of three-level medium excitation by means of a
single photon propagating to the medium along two optical paths with a mutual time delay surpassing the temporal duration
of the photon wave packet. The quantum electrodynamical theory describing this interaction is presented and the S-matrix of
the field is shown for infinite time (t=∞). Using the S-matrix approach, physical properties of the scattering field are studied.
Hence, it is shown that the field has an echo signal at the ω
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carrier frequency. It has been shown that the echo signal exists only in the field amplitude while being absent in its intensity
behaviour. Thus, SP-echo is an interference effect and is not influenced by the energy irradiation. The problems of SP-echo
detection in the gamma-region (where special generation difficulties appear) are discussed. The influence of the additional
detection of theω
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frequency field on the echo signal has been shown. A special case is the EPR-paradox which can appear within the echo phenomenon.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献