By Professor C. J. Joachain, N. J. Kylstra, R. M. Potvliege
The improvement of lasers in a position to generating high-intensity pulses has opened a brand new sector within the research of light-matter interactions. The corresponding laser fields are robust sufficient to compete with the Coulomb forces in controlling the dynamics of atomic structures and provides upward thrust to multiphoton procedures. This publication offers a unified account of this quickly constructing box of physics. the 1st half describes the basic phenomena taking place in extreme laser-atom interactions and provides the elemental theoretical framework to investigate them. the second one half encompasses a particular dialogue of Floquet idea, the numerical integration of the wave equations and approximation equipment for the low- and high-frequency regimes. within the 3rd half, the most multiphoton approaches are mentioned: multiphoton ionization, excessive harmonic and attosecond pulse iteration, and laser-assisted electron-atom collisions. geared toward graduate scholars in atomic, molecular and optical physics, the ebook also will curiosity researchers engaged on laser interactions with topic
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Extra resources for Atoms in Intense Laser Fields
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Delone and V. P. Krainov, Sov. Phys. JETP 64, 1191 (1986). [71] L. D. Landau and E. M. : Addison Wesley, 1958). [72] L. V. Keldysh, Sov. Phys. JETP 20, 1307 (1965). [73] F. H. M. Faisal, J. Phys. B 6, L89 (1973). [74] H. R. Reiss, Phys. Rev. A 22, 1786 (1980). [75] J. E. Bayfield and P. M. Koch, Phys. Rev. Lett. 33, 258 (1974). [76] T. F. Gallagher, Rydberg Atoms (Cambridge: Cambridge University Press, 1984). 34 Basic concepts [77] S. Augst, D. Strickland, D. Meyerhofer, S. L. Chin and J. H. Eberly, Phys.
It is based on the use of phase-stabilized fewcycle driving pulses in combination with the polarization gating technique. Sansone et al. [144] have generated in this way single-cycle isolated 130 as pulses around 36 eV by using 5 fs driving pulses, as shown in Fig. 14. Let us now consider photon emission by positive ions interacting with very intense, ultra-short (few-cycle) pulses. Positive ions can survive higher laser intensities because of their higher binding energies, and can therefore emit more energetic photons [112,145–147].
In later experiments, Seres et al. 3 keV for helium atoms irradiated by 5 fs pulses, and Chen et al. [119] have generated phase-matched high harmonics spanning the water window spectral region. The theoretical treatment of harmonic generation by an intense laser pulse focused onto a gaseous medium has two main aspects which will be discussed in more detail in Chapter 9. First, the microscopic single-atom response to the laser field must be analyzed. Because different atoms in the laser focus experience different peak intensities and phases, the single-atom response must be calculated 24 Basic concepts over a range of laser field intensity profiles.