In this thesis, we briefly introduced the basic concepts of intense laser field, relative atomic experimental phenomena and theories on atomic ionization.

本文首先简要介绍了强场物理的基本概念和相关的原子物理现象，以及研究原子电离现象的有关理论。

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In this case, many interesting phenomena of excitation and photoionization can be observed, for instance, muti-photon ionization, above threshold ionization, tunnel ionization and so on.

这样，我们就可以观察到一些新的现象，如多光子过程，阈上电离，隧道电离等。

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