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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

Σπαχής, Λέανδρος Ο.

Thesis advisor

Τζάλλας, Παρασκευάς

Reviewer

Χαραλαμπίδης, Δημήτριος
Ρακιτζής, Πέτρος

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.

Language

English

Subject

Atto-second physics

High harmonic generation

Laser-matter interaction

Αλληλεπίδραση laser-ύλης

Δημιουργία υψηλής τάξης αρμονικών

Φυσική atto-second

Issue date

2022-07-22

Collection