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)

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.

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
PublisherSPIE
Pages1-8
Number of pages8
ISBN (Electronic)9781510615229
ISBN (Print)9781510615212
DOIs
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
PublisherSPIE
Volume10518
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

Conference20th Conference on Laser Resonators, Microresonators and Beam Control
CountryUnited States
CitySan Francisco
Period29/01/181/02/18

Keywords

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

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