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Proceedings Paper

Optical characterization of phase gratings written by a UV femtosecond laser in PMMA
Author(s): 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
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Paper 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.

Paper Details

Date Published: 27 May 2011
PDF: 7 pages
Proc. SPIE 8082, Optical Measurement Systems for Industrial Inspection VII, 808227 (27 May 2011); doi: 10.1117/12.889429
Show Author Affiliations
S. De Nicola, Istituto Nazionale di Ottica Applicata, CNR (Italy)
S. Abdalah, Istituto Nazionale di Ottica Applicata, CNR (Italy)
K. Al-Naimee, Istituto Nazionale di Ottica Applicata, CNR (Italy)
The Univ. of Manchester (United Kingdom)
A. Geltrude, Istituto Nazionale di Ottica Applicata, CNR (Italy)
M. Locatelli, Istituto Nazionale di Ottica Applicata, CNR (Italy)
Univ. di Firenze (Italy)
R. Meucci, Istituto Nazionale di Ottica Applicata, CNR (Italy)
A. Baum, The Univ. of Manchester (United Kingdom)
W. Perrie, The Univ. of Manchester (United Kingdom)
P. J. Scully, The Univ. of Manchester (United Kingdom)
A. Taranu, The Univ. of Manchester (United Kingdom)
F. T. Arecchi, Istituto Nazionale di Ottica Applicata, CNR (Italy)
Univ. di Firenze (Italy)


Published in SPIE Proceedings Vol. 8082:
Optical Measurement Systems for Industrial Inspection VII
Peter H. Lehmann; Wolfgang Osten; Kay Gastinger, Editor(s)

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