27 May 2011 Optical characterization of phase gratings written by a UV femtosecond laser in PMMA
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Abstract
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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S. De Nicola, S. Abdalah, K. Al-Naimee, A. Geltrude, M. Locatelli, R. Meucci, A. Baum, W. Perrie, P. J. Scully, A. Taranu, F. T. Arecchi, "Optical characterization of phase gratings written by a UV femtosecond laser in PMMA", Proc. SPIE 8082, Optical Measurement Systems for Industrial Inspection VII, 808227 (27 May 2011); doi: 10.1117/12.889429; https://doi.org/10.1117/12.889429
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