The formation by a femtosecond laser beam of microregions in alkali-silicate glasses with different concentrations of Na 2 O, which exhibit birefringence associated with the formation of nanolattices, is demonstrated. The dependences of the phase shift of the formed regions on the number and energy of laser pulses have been established. An increase in the Na 2 O concentration leads to an increase in the minimum number of pulses required for the occurrence of birefringence, but at the same time, when exposed to 107 pulses for glasses of all compositions, the phase shift reaches approximately the same maximum value, which indicates the leading role of diffusion of alkaline ions in the formation of nanolattices in such glasses
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