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Title Coherently-coupled vertical-cavity laser arrays
URL
Publication Date
Date Accessioned
Degree PhD
Discipline/Department 1200
Degree Level doctoral
University/Publisher University of Illinois – Urbana-Champaign
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.
Subjects/Keywords 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
Contributors Choquette, Kent D. (advisor); Choquette, Kent D. (Committee Chair); Coleman, James J. (committee member); Popescu, Gabriel (committee member); Wasserman, Daniel M. (committee member)
Language en
Rights Copyright 2013 Matthew Johnson
Country of Publication us
Record ID handle:2142/46669
Repository uiuc
Date Indexed 2020-03-09
Grantor University of Illinois at Urbana-Champaign
Issued Date 2014-01-16 17:58:30

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…Chapter  2.       It  is  instructive  to  first  consider  the  historical  development,  following  [59],  of   coherently-­‐coupled  edge-­‐emitting  laser  arrays,  which  were  heavily…

…Background     Coherently  coupled  VCSEL  arrays  have  many  features  that  make  them  viable   candidates  for  beam  steering  and  high-­‐radiance  applications.    Applications  for  non-­‐ mechanical…

…optical  beam  steering  include  fiber  switching,  free-­‐space  communications   and  laser  radar.    Radiance,  often  referred  to  as  ‘brightness’,  is  defined  as  power  per  area   per  solid…

…can   only  accept  power  into  a  small  diameter  within  a  limited  cone  of  acceptance,  or  for  free-­‐ space  optical  links,  where  on-­‐axis  power  is  essential.    Vertical  cavity

…speed  than  mechanical  approaches,  which  are  typically  still  the   norm  for  applications  such  as  laser  radar  [1].    Non-­‐mechanical  beam  steering  was  first   demonstrated  at…

…x5B;13-­‐15]  .         Among  the  multiple  figures  of  merit  for  optical  beam  steering,  speed  is  still  a  critical   and  limiting  factor  for  applications  such  as  laser

…diode laser arrays [20, 21], all other beam steering methods alter the wavefront of an incident beam. In contrast, herein we demonstrate phase control at the…

…the refractive index and resonant frequency changes occurring within the element cavities. We finally appeal to coupled mode theory to correlate the 4 observed phase…

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