Abstract:
The effect of chlorine on the spectral properties of silver nanoparticles in the ion-exchanged layers of photo-thermo-refractive glass was studied. It was shown that silver nanoparticles were precipitated only in the UV-irradiated region of the ion-exchanged chlorine-free photo-thermo-refractive glass and refractive index of the irradiated and non-irradiated was the same. It was founded that UV irradiation and subsequent thermal treatment resulted in a growth of NaF nanocrystals on AgCl/NaCl shells formed on the silver nanoparticles in the irradiated ion-exchanged chloride photo-thermo-refractive glass. The refractive index contrast of the irradiated and non-irradiated areas of photo-thermo-refractive glass with chlorine was achieved $\Delta n$ = -3 $\cdot$ 10$^{-3}$. Results of the study demonstrate that it is possible to record the amplitude gratings in the ion-exchanged layers of chlorine-free photo-thermo-refractive glass, and to record the amplitude-phase gratings in the ion-exchanged layers of chloride photo-thermo-refractive glass.
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