Photonics, Volume 7, Issue 4 (December 2020) – 56 articles
Cover Story (view full-size image): Optical phased arrays (OPAs) are a promising technology that can be used to manipulate the distribution of optical power in the far field by controlling the phase of light emitted by multiple spatially separated transmit apertures. By precisely controlling the relative optical phase at the output of the array, OPAs can be used to deliver a large amount of optical power to a specific location in the far field and enable high-bandwidth mechanism-free beam steering and arbitrary beam shaping. This article introduces an OPA architecture in which multiple follower lasers are phase locked to a leader laser at an arbitrary frequency offset, allowing it to support both coherent and spectral beam combining. The system also supports agile solid-state beam steering at speeds limited by the actuation bandwidth of the lasers. View this paper.
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