9 August 2016 Efficient coupling of starlight into single mode photonics using Adaptive Injection (AI)
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Abstract
Using single-mode fibres in astronomy enables revolutionary techniques including single-mode interferometry and spectroscopy. However, injection of seeing-limited starlight into single mode photonics is extremely difficult. One solution is Adaptive Injection (AI). The telescope pupil is segmented into a number of smaller subapertures each with size ~ r0, such that seeing can be approximated as a single tip / tilt / piston term for each subaperture, and then injected into a separate fibre via a facet of a segmented MEMS deformable mirror. The injection problem is then reduced to a set of individual tip tilt loops, resulting in high overall coupling efficiency.
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Barnaby Norris, Barnaby Norris, Nick Cvetojevic, Nick Cvetojevic, Simon Gross, Simon Gross, Alexander Arriola, Alexander Arriola, Peter Tuthill, Peter Tuthill, Jon Lawrence, Jon Lawrence, Samuel Richards, Samuel Richards, Michael Goodwin, Michael Goodwin, Jessica Zheng, Jessica Zheng, "Efficient coupling of starlight into single mode photonics using Adaptive Injection (AI)", Proc. SPIE 9908, Ground-based and Airborne Instrumentation for Astronomy VI, 99085E (9 August 2016); doi: 10.1117/12.2233757; https://doi.org/10.1117/12.2233757
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