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arXiv quant-ph/0608048quant-ph
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Laser -原子相互作用中的一些非微扰和非线性效应

Some Non-Perturbative and Non-Linear Effects in Laser-Atom Interaction

Qi-Ren Zhang

摘要:

我们证明,如果激光强度足够大,无论其频率如何,它总是可以激发原子或诱导原子离散能级之间的跃迁。这意味着在原子与圆频率强激光相互作用的量子跃迁中,原子初态和终态的能量差不一定是量子能量$ω$的整数倍。吸收光谱变得连续。违反了玻尔条件。在强激光光电效应中,光电子的能量变得依赖于光强度。光激发和光电离的跃迁几率和截面与激光强度有关,表明这些过程不能归结为原子与单个光子相互作用的结果,而是原子与激光整体相互作用的过程。光子与原子的相互作用并不是简单的相加作用。影响是非微扰和非线性的。给出了氢原子与强圆偏振激光相互作用过程的数值计算结果,说明了原子与激光相互作用的非微扰和非线性特性。

英文摘要:

We show that if the laser is intense enough, it may always ionize an atom or induce transitions between discrete energy levels of the atom, no matter what is its frequency. It means in the quantum transition of an atom interacting with an intense laser of circular frequency $ω$, the energy difference between the initial and the final states of the atom is not necessarily being an integer multiple of the quantum energy $\hbarω$. The absorption spectra become continuous. The Bohr condition is violated. The energy of photoelectrons becomes light intensity dependent in the intense laser photoelectric effect. The transition probabilities and cross sections of photo-excitations and photo-ionizations are laser intensity dependent, showing that these processes cannot be reduced to the results of interactions between the atom and separate individual photons, they are rather the processes of the atom interacting with the laser as a whole. The interaction of photons on atoms are not simply additive. The effects are non-perturbative and non-linear. Some numerical results for processes between hydrogen atom and intense circularly polarized laser, illustrating the non-perturbative and non-linear character of the atom-laser interaction, are given.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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