Optical characterization of PMMA phase gratings written by a 387 nm femtosecond laser |
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Authors: | A Baum S Abdalah A Geltrude M Locatelli W Perrie A Taranu |
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Institution: | a The Photon Science Institute, University of Manchester, Manchester, M30 9PL, UKb Istituto Nazionale di Ottica, CNR, L.go E. Fermi 56, 50125 Firenze, Italyc Dipartimento di Fisica, Università di Firenze, 50019 Sesto Fiorentino, Italy |
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Abstract: | We report on the fabrication of optical Bragg type phase gratings in polymethyl methacrylate substrates by a femptosecond Ti: Sapphire laser. As for their optical characterization, a spatially resolved microscopy interferometric technique is used to investigate the two-dimensional distribution of the refractive index change produced by the irradiation process. The technique gives a direct and quantitative two-dimensional profile of the index of refraction in irradiated PMMA, providing information on how the fabrication process depends on the laser irradiation. |
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