{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/19089"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/19089","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Integrable semiconductor ring lasers and two-dimensional rectangular lattice distributed feedback lasers","abstract":"Two types of integrable semiconductor lasers are investigated in this thesis. Semiconductor ring lasers with circular and square ring resonators are analyzed, and their fabrications and laser results are described. Two-dimensional rectangular lattice distributed feedback lasers are proposed and analyzed by a coupled mode theory.","abstract_html":"Two types of integrable semiconductor lasers are investigated in this thesis. Semiconductor ring lasers with circular and square ring resonators are analyzed, and their fabrications and laser results are described. Two-dimensional rectangular lattice distributed feedback lasers are proposed and analyzed by a coupled mode theory.","abstract_has_math":false,"creators":["Han, Haewook"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Electrical Engineering","degree_department":null,"school":null,"contributors":["Coleman, James J."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-05-07T11:56:37Z","date_published":"2011-05-07T11:56:37Z","updated_at":"2026-07-22T22:25:12Z","subjects":["Engineering, Electronics and Electrical","Physics, Condensed Matter","Physics, Optics"],"languages":["eng"],"rights":["Copyright 1995 Han, Haewook"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9522114","(UMI)AAI9522114"],"render_values":[{"text":"AAI9522114","href":null,"code":true},{"text":"(UMI)AAI9522114","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/19089","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Coleman, James J."]},{"key":"dc:creator","label":"Author","values":["Han, Haewook"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-05-07T11:56:37Z","10000-01-01","1995"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Electrical Engineering"]},{"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":["Engineering, Electronics and Electrical","Physics, Condensed Matter","Physics, Optics"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 1995 Han, Haewook"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9522114","(UMI)AAI9522114","http://hdl.handle.net/2142/19089"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Two types of integrable semiconductor lasers are investigated in this thesis. Semiconductor ring lasers with circular and square ring resonators are analyzed, and their fabrications and laser results are described. Two-dimensional rectangular lattice distributed feedback lasers are proposed and analyzed by a coupled mode theory.","Strained-layer InGaAs-AlGaAs-GaAs circular ring lasers with a single Y-junction output coupler are fabricated by SiCl$\\sb4$ reactive ion etching. The bending loss calculated by a Wentzel-Kramers-Brilloin (WKB) analysis and the measured threshold currents suggest that the loss of the small radius lasers is mainly due to the nonradiative recombination and scattering at the deeply etched sidewall. A comparison between the estimated and measured longitudinal mode spacings indicates that the small radius ($<$76 $\\mu$m) ring lasers operate in relatively low order whispering gallery modes.","Strained-layer InGaAs-AlGaAs-GaAs square ring lasers with total internal reflection (TIR) mirrors and narrow gap output couplers are described. The modal reflectivity of TIR mirrors is calculated by a plane wave expansion method. A new fabrication technique requiring a single SiO$\\sb2$ mask layer is developed. The square ring lasers operate in a single longitudinal mode with a side mode suppression ratio of $\\sim$20 dB. An asymmetry in the emission spectra indicates the traveling wave operation of the square ring lasers. A new self-aligned etch process is developed for TIR mirrors without additional lift-off and dielectric depositions, and is demonstrated to produce high quality TIR mirrors with a reflectivity of $\\sim$0.93.","Two-dimensional rectangular lattice distributed feedback lasers are described by a coupled-mode analysis of the scalar wave equation derived from a TE vector field. Threshold conditions are presented with the optimum design conditions for minimum threshold gains. For a given area and periods of the grating, there is an optimum structural angle of the grating. If the normal incidence coupling constants of the two orthogonal gratings are the same, the optimum structural angle should be the same as the incidence angle which is determined by the Bragg condition. For the different normal incidence coupling constants, the optimum structural angles are obtained numerically.","Made available in DSpace on 2011-05-07T11:56:37Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9522114.pdf: 4238783 bytes, checksum: da908de84282d2d915f735bd534fd281 (MD5) Previous issue date: 1995","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:34:35Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:13:17-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission","ETDs are only available to UIUC Users without author permission","U of I Only"]},{"key":"dc:title","label":"Title","values":["Integrable semiconductor ring lasers and two-dimensional rectangular lattice distributed feedback lasers"]}]}],"canonical_facts":{"dc:contributor":["Coleman, James J."],"dc:creator":["Han, Haewook"],"dc:date":["2011-05-07T11:56:37Z","10000-01-01","1995"],"dc:description":["Two types of integrable semiconductor lasers are investigated in this thesis. Semiconductor ring lasers with circular and square ring resonators are analyzed, and their fabrications and laser results are described. Two-dimensional rectangular lattice distributed feedback lasers are proposed and analyzed by a coupled mode theory.","Strained-layer InGaAs-AlGaAs-GaAs circular ring lasers with a single Y-junction output coupler are fabricated by SiCl$\\sb4$ reactive ion etching. The bending loss calculated by a Wentzel-Kramers-Brilloin (WKB) analysis and the measured threshold currents suggest that the loss of the small radius lasers is mainly due to the nonradiative recombination and scattering at the deeply etched sidewall. A comparison between the estimated and measured longitudinal mode spacings indicates that the small radius ($<$76 $\\mu$m) ring lasers operate in relatively low order whispering gallery modes.","Strained-layer InGaAs-AlGaAs-GaAs square ring lasers with total internal reflection (TIR) mirrors and narrow gap output couplers are described. The modal reflectivity of TIR mirrors is calculated by a plane wave expansion method. A new fabrication technique requiring a single SiO$\\sb2$ mask layer is developed. The square ring lasers operate in a single longitudinal mode with a side mode suppression ratio of $\\sim$20 dB. An asymmetry in the emission spectra indicates the traveling wave operation of the square ring lasers. A new self-aligned etch process is developed for TIR mirrors without additional lift-off and dielectric depositions, and is demonstrated to produce high quality TIR mirrors with a reflectivity of $\\sim$0.93.","Two-dimensional rectangular lattice distributed feedback lasers are described by a coupled-mode analysis of the scalar wave equation derived from a TE vector field. Threshold conditions are presented with the optimum design conditions for minimum threshold gains. For a given area and periods of the grating, there is an optimum structural angle of the grating. If the normal incidence coupling constants of the two orthogonal gratings are the same, the optimum structural angle should be the same as the incidence angle which is determined by the Bragg condition. For the different normal incidence coupling constants, the optimum structural angles are obtained numerically.","Made available in DSpace on 2011-05-07T11:56:37Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9522114.pdf: 4238783 bytes, checksum: da908de84282d2d915f735bd534fd281 (MD5) Previous issue date: 1995","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:34:35Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:13:17-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission","ETDs are only available to UIUC Users without author permission","U of I Only"],"dc:identifier":["AAI9522114","(UMI)AAI9522114","http://hdl.handle.net/2142/19089"],"dc:language":["eng"],"dc:rights":["Copyright 1995 Han, Haewook"],"dc:subject":["Engineering, Electronics and Electrical","Physics, Condensed Matter","Physics, Optics"],"dc:title":["Integrable semiconductor ring lasers and two-dimensional rectangular lattice distributed feedback lasers"],"dc:type":["text"],"thesis:degree_discipline":["Electrical Engineering"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:25:12Z"}