We report on the fabrication of optical Bragg type phase gratings in polymethyl methacrylate substrates irradiated by a
femtosecond Ti: Sapphire laser. In order to investigate the distribution of the refractive index change produced by the
femtosecond laser irradiation, we performed a two-dimensional visualization and spatially resolved optical analysis of
the induced refractive index profile by using a digital holographic technique and an adaptive-iterative algorithm for
wavefront reconstruction. The technique gives a direct and quantitative two-dimensional profile of the index of
refraction in irradiated samples, providing information how the fabrication process depends on the laser irradiation.
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