In present work we perform analysis of the recorded Bragg gratings on the PTR glass. The analysis includes rigorous couple wave theory and Kogelnik’s theory. Rigorous coupled wave analysis of the recorded gratings includes up to 11 waves. This analysis allows us to retrieve the phase and the amplitude of the Fourier coefficients of a 1-D grating. Which in turns allow to reconstruct the profile of the grating inside the glass volume. Reconstructed profiles of the refractive index inside the gratings explained by the photo-thermo-induced crystallization mechanism.
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