Director of Research (if dissertation) or Advisor (if thesis)
Choquette, Kent D.
Doctoral Committee Chair(s)
Choquette, Kent D.
Committee Member(s)
Coleman, James J.
Popescu, Gabriel
Wasserman, Daniel M.
Department of Study
Electrical & Computer Eng
Discipline
Electrical & Computer Engr
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
vertical cavity surface-emitting lasers
beam steering
phased array
optical phased array
semiconductor laser array
diode laser array
coupled mode theory
dynamic coupled mode theory
Abstract
Coherently-coupled vertical cavity surface-emitting laser (VCSEL) arrays offer a unique approach to beam steering and high-radiance applications, and have many advantages such as small size, low cost, high speed, durability and manufacturing ease. Previous work on coherently-coupled VCSEL arrays has left unfinished the tasks of determining the beam steering mechanism within the arrays and achieving current uniformity across large arrays without resorting to overly-complicated fabrication procedures. This work fulfills the former by establishing a full theoretical connection between the differential current injected into the array elements and the observed steering of the far-field beam. Record high beam-steering speed and phase responsivity are also demonstrated, showing promise for applications in high-speed modulation. The first in-phase emission from a coherently-coupled bottom-emitting VCSEL array is also demonstrated, along with significantly improved current uniformity across larger arrays.
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