A micro-optical module for multi-wavelength addressing of trapped ions

Matthew L Day, Kaushal Choonee, Zachary Chaboyer, Simon Gross, Michael J Withford, Alastair G Sinclair, Graham D Marshall

Research output: Contribution to journalArticle (Academic Journal)peer-review

5 Citations (Scopus)
115 Downloads (Pure)


The control of large-scale quantum information processors based on arrays of trapped ions requires a means to route and focus multiple laser beams to each of many trapping sites in parallel. Here, we combine arrays of fibres, 3D laser-written waveguides and diffractive microlenses to demonstrate the principle of a micro-optic interconnect suited to this task. The module is intended for use with an ion microtrap of 3D electrode geometry. It guides ten independent laser beams with unique trajectories to illuminate a pair of spatially separated target points. Three blue and two infrared beams converge to overlap precisely at each desired position. Typical relative crosstalk intensities in the blue are 3.6 x 10-3 and the average insertion loss across all channels is 8 dB. The module occupies ~104 times less volume than a conventional bulk-optic equivalent and is suited to different ion species.
Original languageEnglish
Article number024007
Number of pages13
JournalQuantum Science and Technology
Issue number2
Early online date24 Feb 2021
Publication statusPublished - Apr 2021

Structured keywords

  • QETLabs


  • diffractive microlenses
  • laser-written waveguides
  • ion microtrap
  • micro-optics


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