Ultrafast Laser Inscription of Achromatic Phase Shifters

Glen Douglass, Teresa Klinner-Teo, Elizabeth Arcadi, Michael J. Withford, Barnaby Norris, Peter Tuthill, Marc Antoine Martinod, Olivier Guyon, Simon Gross

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We report the first demonstration of an achromatic phase-shifter fabricated using Ultrafast Laser Inscription. Phase shifters are essential in integrated photonic circuits for coherent applications such as optical communication and astronomical interferometry [1]. Phase shifters typically use a path length or an effective index difference to generate a differential phase shift. As both methods are chromatic, devices are only effective over a narrow bandwidth. Current methods to create a broadband achromatic phase shift include subwavelength structures [2], and differential waveguide dispersion [3,4]. The latter technique uses three segments of different width combinations to create an achromatic phase shift. Adiabatic tapers are then added between the different widths to reduce losses. These tapers are added to each waveguide to maintain the differential phase shift. Devices are fabricated using the three-dimensional ultrafast laser inscription technique that uses multiphoton absorption at the focal point of an ultrafast laser to induce a refractive index change. The focal point is then translated at 16.7 mm/s and the laser pulse energy is varied to inscribe waveguides of different widths.

Original languageEnglish (US)
Title of host publication2023 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2023
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9798350345995
DOIs
StatePublished - 2023
Externally publishedYes
Event2023 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2023 - Munich, Germany
Duration: Jun 26 2023Jun 30 2023

Publication series

Name2023 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2023

Conference

Conference2023 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2023
Country/TerritoryGermany
CityMunich
Period6/26/236/30/23

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Atomic and Molecular Physics, and Optics

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