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

Abstract

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.

Citation

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), https://doi.org/10.1364/josab.421459

• 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
• DOI: https://doi.org/10.1364/josab.421459
• Public URL: https://durham-repository.worktribe.com/output/1219012