Phase-locked laser array through global antenna mutual coupling

Kao, Tsung -Yu; Reno, John L.; Hu, Qing

doi:10.1038/nphoton.2016.104

Title: Phase-locked laser array through global antenna mutual coupling

Journal Article · Fri Jan 01 00:00:00 EST 2016 · Nature Photonics

DOI:https://doi.org/10.1038/nphoton.2016.104· OSTI ID:1246887

Kao, Tsung -Yu ^[1]; Reno, John L. ^[2]; Hu, Qing ^[3]

Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); LongWave Photonics L.L.C., Mountain View, CA (United States)
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Here, phase locking of an array of lasers is a highly effective way in beam shaping, to increase the output power, and to reduce lasing threshold. In this work, we present a novel phase-locking mechanism based on "antenna mutual coupling" wherein laser elements interact through far-field radiations with definite phase relations. This allows long-range global coupling among array elements to achieve robust 2-dimensional phase-locked laser array. The new scheme is ideal for lasers with deep sub-wavelength confined cavity such as nanolasers, where the divergent beam pattern could be used to form strong coupling among elements in the array. We experimentally demonstrated such a scheme using sub-wavelength short-cavity surface-emitting lasers at terahertz frequency. More than 37 laser elements are phase-locked to each other, delivering up to 6.5 mW single-mode radiations at ~3 terahertz, with maximum 450-mW/A slope efficiency and near diffraction limit beam divergence.

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Research Organization:: Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC04-94AL85000

OSTI ID:: 1246887

Report Number(s):: SAND-2016-0105J; 617601

Journal Information:: Nature Photonics, Journal Name: Nature Photonics; ISSN 1749-4885

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 53 works

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