Efficient coupling of starlight into single mode photonics using Adaptive Injection (AI)

摘要

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 ～ r_0, 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.