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On-sky results for the integrated microlens ring tip-tilt sensor

Hottinger, Philipp; Harris, Robert J.; Crass, Jonathan; Dietrich, Philipp-Immanuel; Blaicher, Matthias; Bechter, Andrew; Sands, Brian; Morris, Timothy; Basden, Alastair G.; Bharmal, Nazim Ali; Heidt, Jochen; Anagnos, Theodoros; Neureuther, Philip L.; Glück, Martin; Power, Jennifer; Pott, Jörg-Uwe; Koos, Christian; Sawodny, Oliver; Quirrenbach, Andreas

On-sky results for the integrated microlens ring tip-tilt sensor Thumbnail


Philipp Hottinger

Robert J. Harris

Jonathan Crass

Philipp-Immanuel Dietrich

Matthias Blaicher

Andrew Bechter

Brian Sands

Jochen Heidt

Theodoros Anagnos

Philip L. Neureuther

Martin Glück

Jennifer Power

Jörg-Uwe Pott

Christian Koos

Oliver Sawodny

Andreas Quirrenbach


We present the first on-sky results of the microlens ring tip-tilt sensor. This sensor uses a 3D printed microlens ring feeding six multimode fibers to sense misaligned light, allowing centroid reconstruction. A tip-tilt mirror allows the beam to be corrected, increasing the amount of light coupled into a centrally positioned single-mode (science) fiber. The sensor was tested with the iLocater acquisition camera at the Large Binocular Telescope in Tucson, Arizona, in November 2019. The limit on the maximum achieved rms reconstruction accuracy was found to be 0.19𝜆/D in both tip and tilt, of which approximately 50% of the power originates at frequencies below 10 Hz. We show the reconstruction accuracy is highly dependent on the estimated Strehl ratio and simulations support the assumption that residual adaptive optics aberrations are the main limit to the reconstruction accuracy. We conclude that this sensor is ideally suited to remove post-adaptive optics noncommon path tip-tilt residuals. We discuss the next steps for concept development, including optimization of the lens and the fiber, tuning of the correction algorithm, and selection of optimal science cases.


Hottinger, P., Harris, R. J., Crass, J., Dietrich, P., Blaicher, M., Bechter, A., …Quirrenbach, A. (2021). On-sky results for the integrated microlens ring tip-tilt sensor. Journal of the Optical Society of America B, 38(9),

Journal Article Type Article
Acceptance Date Jun 16, 2021
Online Publication Date Aug 9, 2021
Publication Date 2021
Deposit Date Jan 24, 2022
Publicly Available Date Jan 24, 2022
Journal Journal of the Optical Society of America B
Print ISSN 0740-3224
Electronic ISSN 1520-8540
Publisher Optica
Peer Reviewed Peer Reviewed
Volume 38
Issue 9


Published Journal Article (20.2 Mb)

Copyright Statement
©2021 Optica Publishing Group. Users may use, reuse, and build upon the article, or use the article for text or data mining, so long as such uses are for non-commercial purposes and appropriate attribution is maintained. All other rights are reserved.

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