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| Identifier |
000388332 |
| Title |
Visualization and control of the electron quantum paths in high field laser-atom interactions |
| Alternative Title |
Απεικόνιση και έλεγχος κβαντικών διαδρομών ηλεκτρονίων μέσα σε ισχυρά πεδία αλληλεπίδρασης ακτινοβολίας laser και ατόμων |
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Author
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Κολλιόπουλος, Γεώργιος
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Thesis advisor
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Χαραλαμπίδης, Δημήτρης
Τζάλλας, Παρασκευάς
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| Abstract |
The fundamental mechanism underlying harmonic emission in the strong-field regime is governed by
tunnel ionization of the atom, followed by the motion of the electron wave-packet in the continuum,
and finally by its recollision with the atomic core. Due to the quantum nature of this process, the
properties of the electron wave-packet strongly correlate with those of the emitted radiation. In this
Thesis, overlapping the harmonic radiation emitted by different interfering electron quantum paths and
imaging the correspondent interference pattern, has been succeeded to investigate the intricacies
associated with the recollision process. The spatial extreme-ultraviolet (EUV)-intensity distribution has
been mapped onto a spatial ion distribution, produced in the EUV focal area through linear and
nonlinear ionization processes of rare gases atoms. Due to the high degree of accuracy that the present
approach provides, has been possible to be demonstrated the quantum nature of the recollision process.
Additionally, based again on the ion-imaging technique, a novel single-shot second-order
autocorrelation scheme for extreme-ultraviolet (EUV) radiation has been proposed. Using simple
analytical and detailed numerical modeling, an evaluation toward selecting an optimum configuration
has been performed. The implementation of the concept to characterize attosecond pulses is discussed,
and the proposed setups are assessed. Finally, is demonstrated the generation of a broadband coherent
continuum EUV radiation by the interaction of rare gases with a many-cycle infrared (IR) laser field
ellipticity-modulated by utilizing a compact collinear many cycle-polarization gating (CMC-PG)
device. The CMC-PG device forlmulates the many-cycle driving pulse in such a way that the EUV
emission is canceled anywhere else but in a small energetic interval of the proper small duration; the
so-called “gate”. The “gate”-width has been measured and is in agreement with the theoretical
calculations. The spectral width of the generated EUV radiation can support isolated pulses of 200 asec
duration. The simplicity, the compactness, the long term stability, and the high IR energy output within
the “gate”, make the CMC-PG device an ideal tool for generating energetic isolated attosecond pulses.
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| Language |
English |
| Subject |
Electron quantum paths |
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High-order harmonic generation |
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Long and short electron trajectories |
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Second-order autocorrelation |
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Single sub-femtosecond pulse |
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Αυτοσυσχέτιση δεύτερης τάξης |
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Γένεση υψηλής - τάξης αρμονικών |
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Κβαντικές διαδρομές ηλεκτρονίων |
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Μακρές και βραχείες διαδρομές ηλεκτρονίων |
| Issue date |
2014-10-13 |
| Collection
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School/Department--School of Sciences and Engineering--Department of Physics--Doctoral theses
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Type of Work--Doctoral theses
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| Views |
699 |
Visualization and control of the electron quantum paths in high field laser-atom interactions
