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ATOMIC COHERENT POPULATION TRAPPING AND ITS APPLICATION IN A RAMAN-TYPE PHOTOIONIZATION SYSTEM WITH THREE BOUND STATES 下载免费PDF全文
We have studied the atomic coherent population trapping in a Raman-type, photoionization system with three bound states. The conditions for the system having two or one stable eigenstate are given. The influences of Fano asymmetric factors on the coberent population transfer are also analyzed.It is found that the property of the system having on]y one population trapping state consisting of the ground state, and one excited state, can be utilized to transfer the atomic initial population into one excited state. 相似文献
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Population trapping via quantum interference in a multi-level system driven by a coherent field is investigated. The influences of the alignment of the transition dipole moments and the energy-level separation of the upper levels are taken into account. Detailed trapping population profiles under the different conditions are given. The research result is helpful for simplifying the theoretical model and selection rational energy level system. 相似文献
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由随机电报过程的性质出发,给出了频率受一个随机电报过程调制系统的Bloch方程,得到了这种系统中的自由感应衰减和光子回波衰减. 相似文献
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强激发二能级原子双光子过程的量子特性 总被引:4,自引:3,他引:1
本文用数值计算研究了强激发二能级原子双光子过程粒子数反转的崩塌与复苏性质和光子统计演化,结果发现,至于崩塌与复苏的性质与低激发情况不同,将随着工值的不断增大,场与原子的非线性耦合越来越强,重复地出现复苏收缩现象. 相似文献
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YU You-wen 《理论物理通讯》1988,10(3):303-320
Baryon-meson vertex structure of the system including s quark was studied from one-gluon- exchange quark-antiquark pair creation model. The theoretical coupling constants are in good agreement with the experimental data except for the cases including π meson, in which the theoretical results are not large enough in comparison with the measured values. 相似文献
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order αS QCD corrections to the Process γ* +γ* → 2 jets are calculated in the case where both p力otons are far off shell and spacelike, with q12/q22 and S=(q1+q2)2 fixed. Compared with the leading Iog approximation results, the scaling of the 2-jet cross-section is still. preserved while the angular distri-butibn gets some corrections. 相似文献
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本文研究了V型三能级原子与真空耦合构成光子-原子束缚态的布居弛豫及其量子相干现象,具体阐述了引起原子相干的必要条件、布居粒子数的交换过程、真空与原子耦合所产生的Lamb移动对自发发射光谱特性带来的影响. 相似文献
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钾原子中由四波,六波混频过程产生的相干辐射 总被引:1,自引:1,他引:1
当双光子共振激发钾原子于6S能级时,由光泵受激辐射,串级受激辐射参与的四波、六波混频以及电离复合的布居过程,产生了位于可见区的诸多相干辐射,文中对混频机制进行了分析和讨论,并对所测得的相干辐射进行了标识。 相似文献
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强场作用下二能级原子双光子过程中辐射场的压缩效应 总被引:2,自引:2,他引:2
本文采用数值计算方法研究了强场作用下二能级原子双光子过程中辐射场的压缩效应.结果表明:辐射场主要处于压缩态,并周期性地出现短时的非压缩效应,随着值的不断增大,场与原子的非线性耦合越来越强,压缩的最大深度不断加深. 相似文献