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Gradient-index beam shapers: fabricated devices and 3D design
Author(s): W. Minster Kunkel; Ali Ghoreyshi; Glen Douglass; Simon Gross; Michael J. Withford; James R. Leger
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Paper Abstract

Advances in 3D fabrication have afforded new freedoms in the design of custom optical elements. We explore a design space where the refractive index may vary freely with position in a material by considering applications in coherent beam shaping. First, we will describe experimental results where we have used femtosecond laser writing to fabricate custom GRIN waveguides in a planar geometry. We show a 2D device that converts a Gaussian beam to a flat top in one transverse direction, and is a single-mode waveguide in the other. Second, we describe a numerical method for designing 3D refractive index profiles. As an example, we will use the 3D method to design a device that transforms a circular beam with a Gaussian intensity profile into a square beam with a flat top.

Paper Details

Date Published: 16 February 2018
PDF: 8 pages
Proc. SPIE 10518, Laser Resonators, Microresonators, and Beam Control XX, 105181S (16 February 2018); doi: 10.1117/12.2290909
Show Author Affiliations
W. Minster Kunkel, Univ. of Minnesota, Twin Cities (United States)
Ali Ghoreyshi, Univ. of Minnesota, Twin Cities (United States)
Glen Douglass, Macquarie Univ. (Australia)
Simon Gross, Macquarie Univ. (Australia)
Michael J. Withford, Macquarie Univ. (Australia)
James R. Leger, Univ. of Minnesota, Twin Cities (United States)

Published in SPIE Proceedings Vol. 10518:
Laser Resonators, Microresonators, and Beam Control XX
Alexis V. Kudryashov; Alan H. Paxton; Vladimir S. Ilchenko, Editor(s)

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