{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/108106"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/108106","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Analysis of Fabry-Pérot laser resonators stabilized by microlenses and applications in speckle-free imaging","abstract":"In this work, laser arrays comprising thousands of beams are experimentally demonstrated by stabilizing macroscopic Fabry-Pérot resonators with microlens arrays. The cavity parameters are tunable to either force fundamental-mode lasing across the array or to promote oscillation of various higher-order transverse modes. The fundamental mode produced by this resonator very closely matches theoretical results calculated with standard Gaussian optics as well as numerical Rayleigh-Sommerfeld diffraction results. It was found that the beams are generally uncoupled in this arrangement, and therefore do not produce interference. The resulting emission from large arrays of lasers has a moderate degree of coherence. Therefore, this laser produces very directional light with high brightness that does not generate coherent artefacts. Because of the moderate coherence and nanosecond-scale pulse duration of the light, this laser was shown to be an ideal light source for speckle-free imaging of dynamic targets. Most notably, fruit flies were imaged while flying with high resolution and without speckle or motion blur, an otherwise challenging task because their wings can beat at frequencies up to 200 Hz.","abstract_html":"In this work, laser arrays comprising thousands of beams are experimentally demonstrated by stabilizing macroscopic Fabry-Pérot resonators with microlens arrays. The cavity parameters are tunable to either force fundamental-mode lasing across the array or to promote oscillation of various higher-order transverse modes. The fundamental mode produced by this resonator very closely matches theoretical results calculated with standard Gaussian optics as well as numerical Rayleigh-Sommerfeld diffraction results. It was found that the beams are generally uncoupled in this arrangement, and therefore do not produce interference. The resulting emission from large arrays of lasers has a moderate degree of coherence. Therefore, this laser produces very directional light with high brightness that does not generate coherent artefacts. Because of the moderate coherence and nanosecond-scale pulse duration of the light, this laser was shown to be an ideal light source for speckle-free imaging of dynamic targets. Most notably, fruit flies were imaged while flying with high resolution and without speckle or motion blur, an otherwise challenging task because their wings can beat at frequencies up to 200 Hz.","abstract_has_math":false,"creators":["Steinforth, Austin W."],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Electrical & Computer Engr","degree_department":null,"school":null,"contributors":["Eden, James Gary"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2020,"date_issued":"2020-08-26T23:54:31Z","date_published":"2020-08-26T23:54:31Z","updated_at":"2026-07-22T22:24:47Z","subjects":["laser","resonator","speckle","imaging","laser array"],"languages":["en"],"rights":["Copyright 2020 Austin Steinforth"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/108106","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Eden, James Gary"]},{"key":"dc:creator","label":"Author","values":["Steinforth, Austin W."]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2020-08-26T23:54:31Z","2022-08-26T23:58:55Z","2020-04-13","2020-05"]},{"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":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["M.S."]},{"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","resonator","speckle","imaging","laser array"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2020 Austin Steinforth"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/108106"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["In this work, laser arrays comprising thousands of beams are experimentally demonstrated by stabilizing macroscopic Fabry-Pérot resonators with microlens arrays. The cavity parameters are tunable to either force fundamental-mode lasing across the array or to promote oscillation of various higher-order transverse modes. The fundamental mode produced by this resonator very closely matches theoretical results calculated with standard Gaussian optics as well as numerical Rayleigh-Sommerfeld diffraction results. It was found that the beams are generally uncoupled in this arrangement, and therefore do not produce interference. The resulting emission from large arrays of lasers has a moderate degree of coherence. Therefore, this laser produces very directional light with high brightness that does not generate coherent artefacts. Because of the moderate coherence and nanosecond-scale pulse duration of the light, this laser was shown to be an ideal light source for speckle-free imaging of dynamic targets. Most notably, fruit flies were imaged while flying with high resolution and without speckle or motion blur, an otherwise challenging task because their wings can beat at frequencies up to 200 Hz.","Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2022-05-01","The student, Austin Steinforth, accepted the attached license on 2020-04-11 at 13:06.","The student, Austin Steinforth, submitted this Thesis for approval on 2020-04-11 at 13:18.","This Thesis was approved for publication on 2020-04-13 at 19:14.","DSpace SAF Submission Ingestion Package generated from Vireo submission #14962 on 2020-08-25 at 17:27:24","Made available in DSpace on 2020-08-26T23:54:31Z (GMT). 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The cavity parameters are tunable to either force fundamental-mode lasing across the array or to promote oscillation of various higher-order transverse modes. The fundamental mode produced by this resonator very closely matches theoretical results calculated with standard Gaussian optics as well as numerical Rayleigh-Sommerfeld diffraction results. It was found that the beams are generally uncoupled in this arrangement, and therefore do not produce interference. The resulting emission from large arrays of lasers has a moderate degree of coherence. Therefore, this laser produces very directional light with high brightness that does not generate coherent artefacts. Because of the moderate coherence and nanosecond-scale pulse duration of the light, this laser was shown to be an ideal light source for speckle-free imaging of dynamic targets. 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