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GRACE Follow On Project: Optical-Phased Array explained

Emmanuel Malikides is an Honours student and David Bowman is a postdoctoral researcher from the Centre for Gravitational Physics at The Australian National University. In this video they explain a newly developed component for future space-based laser interferometry missions: a beam steering device called an the optical-phased array. In order to get the strongest gravitational signal from the Earth the GRACE satellites will travel in a low orbit where they will be continuously buffeted by the thin atmosphere. This means the lasers from each spacecraft must be rapidly adjusted to point at the other spacecraft. An optical-phased array would allow the lasers to be continuously re-aimed without any moving parts.