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Choquette, Kent D Choquette, Kent D Lyding, Joseph Lee, Minjoo Dragic, Peter Thompson, Bradley Jay 2019-11-26T20:33:49Z 2019-11-26T20:33:49Z 2019-07-03 2019-08 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. Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2019-11-26 without embargo terms The student, Bradley Thompson, accepted the attached license on 2019-07-03 at 10:13. The student, Bradley Thompson, submitted this Dissertation for approval on 2019-07-03 at 10:38. This Dissertation was approved for publication on 2019-07-03 at 16:32. DSpace SAF Submission Ingestion Package generated from Vireo submission #14149 on 2019-11-26 at 12:50:32 Made available in DSpace on 2019-11-26T20:33:49Z (GMT). No. of bitstreams: 3 THOMPSON-DISSERTATION-2019.pdf: 14007260 bytes, checksum: bae577b9b46745ed4ff57e2d4f0b3542 (MD5) LICENSE.txt: 4213 bytes, checksum: 4186790b8a3974b454550bd359b531ff (MD5) PROQUEST_LICENSE.txt: 4559 bytes, checksum: b1c1b544ffbdd4c93516749f82f4dbe7 (MD5) Previous issue date: 2019-07-03 application/pdf http://hdl.handle.net/2142/105641 en Copyright 2019 Bradley Jay Thompson 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 Coherently coupling multiple elements in vertical-cavity surface-emitting laser arrays text text Electrical & Computer Eng Electrical & Computer Engr University of Illinois at Urbana-Champaign Dissertation Ph.D.