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Polarization mechanisms and structural rearrangements in thermally poled sodium-alumino phosphate glasses

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Polarization mechanisms and structural rearrangements in thermally poled sodium-alumino phosphate glasses
Καμίτσος, Ευστράτιος Ι.
Βαρσάμης, Χρήστος-Πλάτων Ε.
Dussauze, Marc
Rodriguez, Vincent
Velli, Leoni
Άρθρο σε επιστημονικό περιοδικό
2010-02-15
MELVILLE
Thermally poled glasses of composition 0.20Na(2)O-0.15Al(2)O(3)-0.65P(2)O(5) were investigated by second harmonic generation (SHG) to characterize the induced second order optical nonlinearities (chi(2)), and by infrared reflectance and micro-Raman spectroscopy to probe structural rearrangements in the nonlinear optical (NLO) layer. The SHG signals showed anodic and bulk chi(2) contributions, with the anodic response being one order of magnitude stronger. Also, a good agreement was found between the thickness of the NLO anodic layer (approximately 3 mu m) and the depth where structural changes were detected. The latter include the destruction of bonds between phosphorus and nonbridging oxygen atoms, this process leads to the release and migration of sodium cations and oxide anions and to the enhancement of glass network connectivity in the anodic NLO layer.
Φυσική (EL)
Physics (EN)
Raman spectra
light polarisation
aluminium compounds
photoreflectance
optical harmonic generation
sodium compounds
glass structure
phosphate glasses
Physics, Applied
English
American Institute of Physics
Journal of Applied Physics
© AMER INST PHYSICS
© AMER INST PHYSICS (EN)
National Hellenic Research Foundation (NHRF)
Helios - Repository of the National Hellenic Research Foundation (NHRF)



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