Population inversion in a strongly driven two-level system at far-off resonance
Population inversion in a strongly driven two-level system at far-off resonance
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DOI：
10.1088/1361-6455/aa8550
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发表时间：
2017-08
期刊：
影响因子：
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通讯作者：
Youyuan Zhang;E. Lötstedt;K. Yamanouchi
中科院分区：
文献类型：
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作者：
Youyuan Zhang;E. Lötstedt;K. Yamanouchi
研究了强驱动二能级系统中的布居迁移动力学。结果表明，当突然开启光子能量约为两能级能量间隔一半的激光脉冲时，可以有效地实现布居反转。当中性原子或分子在激光场的峰值被电离，随后在原子或分子离子的两个态之间发生激光驱动的布居转移时，这种情况就实现了。基于准静态Floquet理论，通过数值计算，研究了离子在激光场中的有效布居转移机制。
The population transfer dynamics in a strongly driven two-level system is studied. It is shown that population inversion can be efficiently achieved when a laser pulse whose photon energy is about half of the energy separation of the two levels is turned on suddenly. This situation is realized when a neutral atom or molecule is ionized at the peak of the laser field, followed by the laser-driven population transfer among two states of an atomic or molecular ion. The mechanism of the efficient population transfer for an ion effectively exposed to a laser field with a sudden turn-on is examined by numerical calculations based on the quasi-stationary Floquet theory.