Active phase locking of a three-aperture array using a corner cube lateral transfer reflector

Author:

Petrak Benjamin1,Krainak Michael1ORCID

Affiliation:

1. Relative Dynamics Inc.

Abstract

We present a novel technique for coherent beam combining of a three-aperture array. In our method, a retroreflector samples the beam from the edge of each aperture and redirects the sampled beams back through the gap in the center. The sampled beams contain both angle and phase information for the three-aperture array, which can be used to lock the phase and tip/tilt. In a proof-of-concept experiment, we phase-lock the three-aperture array by maximizing the power through a pin hole of the far-field pattern of the sampled array via the stochastic parallel gradient descent algorithm. This approach eliminates the need for bulky sampling optics, which is particularly advantageous for the large-diameter arrays required for long distance inter-satellite free-space optical communication.

Funder

Goddard Space Flight Center

Publisher

Optica Publishing Group

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