Gradient-index beam shapers: Fabricated devices and 3D design method

W. Minster Kunkel, Ali Ghoreyshi, Glen Douglass, Simon Gross, Michael J. Withford, James R. Leger

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contributionpeer-review

1 Citation (Scopus)


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.

Original languageEnglish
Title of host publicationLaser Resonators, Microresonators, and Beam Control XX
EditorsAlexis V. Kudryashov, Alan H. Paxton, Vladimir S. Ilchenko
Place of PublicationBellingham, Washington
Number of pages8
ISBN (Electronic)9781510615229
ISBN (Print)9781510615212
Publication statusPublished - 16 Feb 2018
Event20th Conference on Laser Resonators, Microresonators and Beam Control - San Francisco, United States
Duration: 29 Jan 20181 Feb 2018

Publication series

NameProceedings of SPIE
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


Conference20th Conference on Laser Resonators, Microresonators and Beam Control
Country/TerritoryUnited States
CitySan Francisco


  • beam shaping
  • direct write
  • Graded index
  • GRIN
  • mode conversion
  • multimode waveguides
  • two-photon lithography


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