{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/115764"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/115764","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Stable and unstable resonators within Fabry-Pérot optical cavities containing microlenses: laser arrays, low-coherence imaging, and fractal laser modes","abstract":"Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2024-05-01","abstract_html":"Submission published under a 24 month embargo labeled &#x27;Closed Access&#x27;, the embargo will last until 2024-05-01","abstract_has_math":false,"creators":["Steinforth, Austin William"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Electrical & Computer Engr","degree_department":null,"school":null,"contributors":["Eden, James G","Waldrop, Lara","Dragic, Peter","Fang, Kejie"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2022,"date_issued":"2022-05","date_published":"2022-05","updated_at":"2026-07-22T22:24:55Z","subjects":["laser","optics","coherence","imaging","fractal","microlens","microsphere","Fabry-Perot"],"languages":["en","eng"],"rights":["Copyright 2022 Austin William Steinforth"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://hdl.handle.net/2142/115764","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Eden, James G","Waldrop, Lara","Dragic, Peter","Fang, Kejie"]},{"key":"dc:creator","label":"Author","values":["Steinforth, Austin William"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2022-05","2022-04-15"]},{"key":"dc:type","label":"Dc Type","values":["text","Thesis"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Electrical & Computer Engr"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["laser","optics","coherence","imaging","fractal","microlens","microsphere","Fabry-Perot"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en","eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2022 Austin William Steinforth"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://hdl.handle.net/2142/115764"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2024-05-01","The student, Austin Steinforth, accepted the attached license on 2022-04-14 at 20:36.","The student, Austin Steinforth, submitted this Dissertation for approval on 2022-04-14 at 20:54.","This Dissertation was approved for publication on 2022-04-15 at 11:42.","DSpace SAF Submission Ingestion Package generated from Vireo submission #17683 on 2022-11-14 at 09:57:02","This work investigates Fabry–Pérot laser resonators that contain arrays of microlenses. The lenses locally stabilized the resonator, which enabled arrays comprising hundreds to thousands of independent microbeams to be generated from a single cavity of modest dimensions. When such beam arrays were used as illuminators for full-field imaging, they exhibited a reduced spatial coherence and increased angular diversity compared to a conventional, highly coherent laser. These factors resulted in speckle suppression that scaled as ~N^(−1/2), where N is the number of independent beams in the array. The short duration (< 10 ns) and high pulse energy (≥8 mJ) of the array emission made it possible to image targets that moved at speeds up to 300 m/s with high resolution and no motion blur, as well as targets that were far from the source and camera (≥5 m, at present), and when optically dense fog intervened the beam path. Regions in between the lenses behaved as unstable resonators and were found to exhibit fractal characteristics in their transverse electric field profiles. Families of modes were simulated for two specific resonator configurations, and higher-order fractal modes were generated experimentally for the first time. The fractal dimension of each mode was found to evolve as the field propagated through the cavity."]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Stable and unstable resonators within Fabry-Pérot optical cavities containing microlenses: laser arrays, low-coherence imaging, and fractal laser modes"]}]}],"canonical_facts":{"dc:contributor":["Eden, James G","Waldrop, Lara","Dragic, Peter","Fang, Kejie"],"dc:creator":["Steinforth, Austin William"],"dc:date":["2022-05","2022-04-15"],"dc:description":["Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2024-05-01","The student, Austin Steinforth, accepted the attached license on 2022-04-14 at 20:36.","The student, Austin Steinforth, submitted this Dissertation for approval on 2022-04-14 at 20:54.","This Dissertation was approved for publication on 2022-04-15 at 11:42.","DSpace SAF Submission Ingestion Package generated from Vireo submission #17683 on 2022-11-14 at 09:57:02","This work investigates Fabry–Pérot laser resonators that contain arrays of microlenses. The lenses locally stabilized the resonator, which enabled arrays comprising hundreds to thousands of independent microbeams to be generated from a single cavity of modest dimensions. When such beam arrays were used as illuminators for full-field imaging, they exhibited a reduced spatial coherence and increased angular diversity compared to a conventional, highly coherent laser. These factors resulted in speckle suppression that scaled as ~N^(−1/2), where N is the number of independent beams in the array. The short duration (< 10 ns) and high pulse energy (≥8 mJ) of the array emission made it possible to image targets that moved at speeds up to 300 m/s with high resolution and no motion blur, as well as targets that were far from the source and camera (≥5 m, at present), and when optically dense fog intervened the beam path. Regions in between the lenses behaved as unstable resonators and were found to exhibit fractal characteristics in their transverse electric field profiles. Families of modes were simulated for two specific resonator configurations, and higher-order fractal modes were generated experimentally for the first time. The fractal dimension of each mode was found to evolve as the field propagated through the cavity."],"dc:format":["application/pdf"],"dc:identifier":["https://hdl.handle.net/2142/115764"],"dc:language":["en","eng"],"dc:rights":["Copyright 2022 Austin William Steinforth"],"dc:subject":["laser","optics","coherence","imaging","fractal","microlens","microsphere","Fabry-Perot"],"dc:title":["Stable and unstable resonators within Fabry-Pérot optical cavities containing microlenses: laser arrays, low-coherence imaging, and fractal laser modes"],"dc:type":["text","Thesis"],"thesis:degree_discipline":["Electrical & Computer Engr"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:24:55Z"}