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Αρχική    Whispering gallery mode resonation in ion-exchanged borosilicate glass fibers  

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Τίτλος Whispering gallery mode resonation in ion-exchanged borosilicate glass fibers
Συγγραφέας Κοκκινίδης, Νικόλαος
Σύμβουλος διατριβής Πισσαδάκης, Σταύρος
Περίληψη In the present thesis is presented an analysis on the potassium (K+) ion-exchange process in borosilicate glass, optical fiber whispering gallery mode cavities. The ion-exchange was achieved using the melt bath technique in a potassium nitrate melt, for typical times of 11, 22 and 44 hours. With the help of a tapered optical fiber coupler, whispering gallery mode spectra were obtained, while by applying longitudinal strain on the cavity, the relevant mode shifting effects emerge, as well as the impact of the ion-exchange process on the photoelastic properties of the glass cavity material. To gain a better insight, energy-dispersive X-ray spectroscopy revealed the concentrations profiles of the potassium and sodium ions in different depths from the cavity’s circumference, COMSOL Multiphysics simulations provided a valid digital representation of the system, and to investigate the effect of non-symmetrical ion-migration and corresponding refractive index annular changes, ion-exchanged cavities we thermally poled. Lastly, in order to study the Young’s modulus modifications introduced by the ion-exchange process, the hardness Knoop was measured using the micro-indentation method on typical BK-7 slabs that had undergone the same treatment.
Γλώσσα Αγγλικά
Ημερομηνία έκδοσης 2023-03-31
Συλλογή   Σχολή/Τμήμα--Σχολή Θετικών και Τεχνολογικών Επιστημών--Τμήμα Φυσικής--Πτυχιακές εργασίες
  Τύπος Εργασίας--Πτυχιακές εργασίες
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