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Title:Coherently coupling multiple elements in vertical-cavity surface-emitting laser arrays
Author(s):Thompson, Bradley Jay
Director of Research:Choquette, Kent D
Doctoral Committee Chair(s):Choquette, Kent D
Doctoral Committee Member(s):Lyding, Joseph; Lee, Minjoo; Dragic, Peter
Department / Program:Electrical & Computer Eng
Discipline:Electrical & Computer Engr
Degree Granting Institution:University of Illinois at Urbana-Champaign
Degree:Ph.D.
Genre:Dissertation
Subject(s):vertical cavity surface emitting laser
VCSEL
VCSEL array
laser array
phased array
optical phased array
semiconductor laser array
diode laser array
coherent array
coherent coupling
resonance tuning
laser mode
supermode
multielement array
photonics
Abstract:Vertical-cavity surface-emitting laser (VCSEL) arrays with three or more emitters coherently coupled are the focus of this work. VCSEL arrays have many established applications and reliable coherent VCSEL arrays are a next step in their progression. The key innovation of this work is individual addressability to each array element, which allows for tuning the elements into coherence in photonic crystal ion-implanted VCSEL arrays. The VCSEL array design and fabrication are discussed with an emphasis on achieving a high yield of coherent arrays. Ion- implantation allows individual addressability that enables reliable resonant tuning. In addition, individual addressability provides a means for supermode engineering. A simulation model for linear leaky-mode VCSEL arrays is developed in order to predict the lasing coherent supermode for a specified array structure and relative biasing. The simulation model is verified through comparison to experimental results of a three-element linear array. Several array geometries with multiple elements are fabricated and are demonstrated to operate coherently in a variety of coherent supermode emission patterns. Laser characterization of laser output power, spectra, near-field intensity, and far-field emission are included. The conclusion of this work demonstrates that controlling the far-field emission through specific coherent bias points within a photonic crystal ion-implanted VCSEL array is a viable means for optical mode engineering.
Issue Date:2019-07-03
Type:Text
URI:http://hdl.handle.net/2142/105641
Rights Information:Copyright 2019 Bradley Jay Thompson
Date Available in IDEALS:2019-11-26
Date Deposited:2019-08


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