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 contribution

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 (US)
Title of host publicationLaser Resonators, Microresonators, and Beam Control XX
EditorsAlexis V. Kudryashov, Vladimir S. Ilchenko, Alan H. Paxton
PublisherSPIE
ISBN (Electronic)9781510615212
DOIs
StatePublished - Jan 1 2018
Event20th Conference on Laser Resonators, Microresonators and Beam Control - San Francisco, United States
Duration: Jan 29 2018Feb 1 2018

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume10518
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

Conference20th Conference on Laser Resonators, Microresonators and Beam Control
CountryUnited States
CitySan Francisco
Period1/29/182/1/18

Keywords

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

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  • Cite this

    Kunkel, W. M., Ghoreyshi, A., Douglass, G., Gross, S., Withford, M. J., & Leger, J. R. (2018). Gradient-index beam shapers: Fabricated devices and 3D design method. In A. V. Kudryashov, V. S. Ilchenko, & A. H. Paxton (Eds.), Laser Resonators, Microresonators, and Beam Control XX [105181S] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 10518). SPIE. https://doi.org/10.1117/12.2290909