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Title:Evanescently Coupled Vertical Cavity Laser Arrays
Author(s):Lehman, Ann C.
Doctoral Committee Chair(s):Choquette, Kent D.
Department / Program:Electrical and Computer Engineering
Discipline:Electrical and Computer Engineering
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Engineering, Electronics and Electrical
Abstract:Evanescent optical coupling between elements in vertical cavity surface emitting laser (VCSEL) arrays is interesting for applications in areas such as optical communications, image processing, and electronic beam-steering. Past work in coherently coupled VCSEL arrays has resulted in out-of-phase arrays or more desirable in-phase arrays, which suffer from complex fabrication processes. This work examines two types of evanescently coupled VCSEL arrays: photonic crystal (PhC) and implant-defined arrays. Both array types exhibit electronic beam-steering due to a variable phase difference between neighboring lasers. This phase difference is tunable with changes in the differential current injection between lasers. This work uses antenna array theory and coherence theory to discover that coherence is maximized around purely in-phase and out-of-phase operation conditions. Additionally, this work studies the modes of PhC VCSELs and develops a coupling theory which predicts the frequency splitting between lasers. Because implant-defined arrays do not include optical loss between lasers, these arrays tend to operate in-phase with minimal processing complexity. Thus, devices are studied and developed which operate in-phase and allow for electronic beam-steering, both of which are useful for potential applications.
Issue Date:2007
Description:72 p.
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2007.
Other Identifier(s):(MiAaPQ)AAI3269958
Date Available in IDEALS:2015-09-25
Date Deposited:2007

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