Laser interferometry between drag-free satellites has been under development for 20 years. It will be used for the observation of low-frequency gravitational waves in LISA. Similar technology will be employed for the GRACE Follow-on Geodesy mission.
© 2012 OSA
K. Danzmann, "Laser Interferometry in Space for Gravitational Wave Detection and Geodesy," in Conference on Lasers and Electro-Optics 2012, OSA Technical Digest (online) (Optical Society of America, 2012), paper JW1C.3.
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