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

Hottinger, Philipp and Harris, Robert J. and Crass, Jonathan and Dietrich, Philipp-Immanuel and Blaicher, Matthias and Bechter, Andrew and Sands, Brian and Morris, Timothy and Basden, Alastair G. and Bharmal, Nazim Ali and Heidt, Jochen and Anagnos, Theodoros and Neureuther, Philip L. and Glück, Martin and Power, Jennifer and Pott, Jörg-Uwe and Koos, Christian and Sawodny, Oliver and Quirrenbach, Andreas (2021) 'On-sky results for the integrated microlens ring tip-tilt sensor.', Journal of the Optical Society of America B, 38 (9).


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.

Item Type:Article
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Publisher 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.
Date accepted:16 June 2021
Date deposited:24 January 2022
Date of first online publication:09 August 2021
Date first made open access:24 January 2022

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