Post-graduate theses
Current Record: 37 of 291
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Identifier |
000449340 |
Title |
Optimization and characterization of highly elliptical XUV radiation |
Alternative Title |
Βελτιστοποίηση και χαρακτηρισμός της παραγωγής υψηλά ελλειπτικά πολωμένης ακτινοβολίας |
Author
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Σπαχής, Λέανδρος Ο.
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Thesis advisor
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Τζάλλας, Παρασκευάς
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Reviewer
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Χαραλαμπίδης, Δημήτριος
Ρακιτζής, Πέτρος
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Abstract |
The purpose of this thesis is the experimental study of the generation of highly elliptically
polarized XUV light, produced through the non‐linear process of high‐order harmonic
generation, via the interaction of a femtosecond infrared (IR) bicircular (at 800nm and 400nm)
laser field with Argon gas. The bi‐circular filed was produced using a MAΖEL-TOV-like (Mach-
Zehnder-Less for Threefold Optical Virginia spiderwort-like) device, a crucial component of
which is a BBO crystal. This process can lead to the production of table‐top sources of XUV
light with circular/elliptical polarization and ultrashort time duration (from tens of
femtoseconds to hundreds of attoseconds), which can be utilized to further our understanding
of the structural, electronic and magnetic properties of matter. The first aim of the work
presented here is the spectroscopic characterization of the high harmonics generated and the
study of the changes introduced in the spectra by different rotation angles of the BBO crystal,
leading to the optimization of the produced XUV ellipticity. The second aim is the
characterization of the polarization state of the generated high harmonics, and the
confirmation of the presence and stability of high ellipticity. Both experiments were
conducted in the “Attosecond Science and Technology” laboratory at the Institute for
Electronic Structure and Lasers (at FORTH), using the MW line driven by the Ti‐Sapphire pulsed
laser, with carrier wavelength of 800nm, pulse duration of 25fs and energy up to 400mJ per
pulse. The spectral characterization was achieved using a Time‐of‐Flight spectrometer, while
the polarization state was studied using a reflective polarimeter and a grating spectrometer.
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Language |
English |
Subject |
Atto-second physics |
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High harmonic generation |
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Laser-matter interaction |
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Αλληλεπίδραση laser-ύλης |
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Δημιουργία υψηλής τάξης αρμονικών |
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Φυσική atto-second |
Issue date |
2022-07-22 |
Collection
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School/Department--School of Sciences and Engineering--Department of Physics--Post-graduate theses
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Type of Work--Post-graduate theses
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Permanent Link |
https://elocus.lib.uoc.gr//dlib/5/7/8/metadata-dlib-1656508908-600044-4213.tkl
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Views |
357 |