{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/22327"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/22327","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"On the performance characteristics of multiple pass hydrogen fluoride chemical laser master oscillator/power amplifiers","abstract":"The performance of a cw Hydrogen Fluoride (HF) chemical laser master oscillator with power amplifier was measured as a function of input power, the number of passes through the gain media, location of the optical axis of the input beam and oscillator/amplifier flow field match/mismatch. The amplification ratio is an inverse function of the input power (intensity) and, for maximum amplification, the peak of the intensity distribution must be matched to the peak of the zero power gain distribution in the amplifier. The measured single pass P$\\sb{\\rm out}$ versus P$\\sb{\\rm in}$ performance curve showed that, after a continuous increase, the difference P$\\sb{\\rm out} \\cdot$ P$\\sb{\\rm in}$ remained almost constant over a wide range of input powers and that about one third of a device's oscillator output must be input to obtain single pass amplifier output equal to the device's oscillator performance. For two pass amplification, a substantial performance advantage was measured when the two passes overlapped at least sixty percent and filled less than eighty percent of the zero power gain zone of the amplifier. The measured two pass P$\\sb{\\rm out}$ versus P$\\sb{\\rm in}$ performance curve was significantly above the single pass data and showed that only one sixth of a device's oscillator output must be input to obtain two pass amplifier output equal to the device's oscillator performance.","abstract_html":"The performance of a cw Hydrogen Fluoride (HF) chemical laser master oscillator with power amplifier was measured as a function of input power, the number of passes through the gain media, location of the optical axis of the input beam and oscillator/amplifier flow field match/mismatch. The amplification ratio is an inverse function of the input power (intensity) and, for maximum amplification, the peak of the intensity distribution must be matched to the peak of the zero power gain distribution in the amplifier. The measured single pass P$\\sb{\\rm out}$ versus P$\\sb{\\rm in}$ performance curve showed that, after a continuous increase, the difference P$\\sb{\\rm out} \\cdot$ P$\\sb{\\rm in}$ remained almost constant over a wide range of input powers and that about one third of a device's oscillator output must be input to obtain single pass amplifier output equal to the device's oscillator performance. For two pass amplification, a substantial performance advantage was measured when the two passes overlapped at least sixty percent and filled less than eighty percent of the zero power gain zone of the amplifier. The measured two pass P$\\sb{\\rm out}$ versus P$\\sb{\\rm in}$ performance curve was significantly above the single pass data and showed that only one sixth of a device's oscillator output must be input to obtain two pass amplifier output equal to the device's oscillator performance.","abstract_has_math":true,"creators":["Waldo, Robert Eugene"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Aerospace Engineering","degree_department":null,"school":null,"contributors":["Sentman, Lee H."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-05-07T13:36:21Z","date_published":"2011-05-07T13:36:21Z","updated_at":"2026-07-22T22:25:19Z","subjects":["Engineering, Aerospace","Engineering, Electronics and Electrical"],"languages":["eng"],"rights":["Copyright 1991 Waldo, Robert Eugene"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9211023","(UMI)AAI9211023"],"render_values":[{"text":"AAI9211023","href":null,"code":true},{"text":"(UMI)AAI9211023","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/22327","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Sentman, Lee H."]},{"key":"dc:creator","label":"Author","values":["Waldo, Robert Eugene"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-05-07T13:36:21Z","10000-01-01","1991"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Aerospace 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, Aerospace","Engineering, Electronics and Electrical"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 1991 Waldo, Robert Eugene"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9211023","(UMI)AAI9211023","http://hdl.handle.net/2142/22327"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["The performance of a cw Hydrogen Fluoride (HF) chemical laser master oscillator with power amplifier was measured as a function of input power, the number of passes through the gain media, location of the optical axis of the input beam and oscillator/amplifier flow field match/mismatch. The amplification ratio is an inverse function of the input power (intensity) and, for maximum amplification, the peak of the intensity distribution must be matched to the peak of the zero power gain distribution in the amplifier. The measured single pass P$\\sb{\\rm out}$ versus P$\\sb{\\rm in}$ performance curve showed that, after a continuous increase, the difference P$\\sb{\\rm out} \\cdot$ P$\\sb{\\rm in}$ remained almost constant over a wide range of input powers and that about one third of a device's oscillator output must be input to obtain single pass amplifier output equal to the device's oscillator performance. For two pass amplification, a substantial performance advantage was measured when the two passes overlapped at least sixty percent and filled less than eighty percent of the zero power gain zone of the amplifier. The measured two pass P$\\sb{\\rm out}$ versus P$\\sb{\\rm in}$ performance curve was significantly above the single pass data and showed that only one sixth of a device's oscillator output must be input to obtain two pass amplifier output equal to the device's oscillator performance.","When the input beam contained time-dependent oscillations, the amplitude modulation of the output beam was reduced by a factor that equaled the amplification ratio of the amplifier; the amplifier had no effect on the period (frequency) of the oscillations of the input beam.","An amplifier performance model that predicts a device's amplifier performance given the device's oscillator performance as a function of reflectivity was developed. The model was used to predict amplifier performance as a function of gain length and the number of passes through the gain media. When the amplifier performance is plotted in terms of non dimensional powers, $\\zeta\\sb{\\rm out}$ versus $\\zeta\\sb{\\rm in}$, gain length dependent, device independent curves result. The non dimensional amplifier performance curves showed that a one meter oscillator may be able to drive as many as twelve two pass amplifiers.","Made available in DSpace on 2011-05-07T13:36:21Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9211023.pdf: 7348524 bytes, checksum: 347ace819d09104eca6b7d4ffc46003c (MD5) Previous issue date: 1991","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:56:52Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:26:37-05:00 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":["On the performance characteristics of multiple pass hydrogen fluoride chemical laser master oscillator/power amplifiers"]}]}],"canonical_facts":{"dc:contributor":["Sentman, Lee H."],"dc:creator":["Waldo, Robert Eugene"],"dc:date":["2011-05-07T13:36:21Z","10000-01-01","1991"],"dc:description":["The performance of a cw Hydrogen Fluoride (HF) chemical laser master oscillator with power amplifier was measured as a function of input power, the number of passes through the gain media, location of the optical axis of the input beam and oscillator/amplifier flow field match/mismatch. The amplification ratio is an inverse function of the input power (intensity) and, for maximum amplification, the peak of the intensity distribution must be matched to the peak of the zero power gain distribution in the amplifier. The measured single pass P$\\sb{\\rm out}$ versus P$\\sb{\\rm in}$ performance curve showed that, after a continuous increase, the difference P$\\sb{\\rm out} \\cdot$ P$\\sb{\\rm in}$ remained almost constant over a wide range of input powers and that about one third of a device's oscillator output must be input to obtain single pass amplifier output equal to the device's oscillator performance. For two pass amplification, a substantial performance advantage was measured when the two passes overlapped at least sixty percent and filled less than eighty percent of the zero power gain zone of the amplifier. The measured two pass P$\\sb{\\rm out}$ versus P$\\sb{\\rm in}$ performance curve was significantly above the single pass data and showed that only one sixth of a device's oscillator output must be input to obtain two pass amplifier output equal to the device's oscillator performance.","When the input beam contained time-dependent oscillations, the amplitude modulation of the output beam was reduced by a factor that equaled the amplification ratio of the amplifier; the amplifier had no effect on the period (frequency) of the oscillations of the input beam.","An amplifier performance model that predicts a device's amplifier performance given the device's oscillator performance as a function of reflectivity was developed. The model was used to predict amplifier performance as a function of gain length and the number of passes through the gain media. When the amplifier performance is plotted in terms of non dimensional powers, $\\zeta\\sb{\\rm out}$ versus $\\zeta\\sb{\\rm in}$, gain length dependent, device independent curves result. The non dimensional amplifier performance curves showed that a one meter oscillator may be able to drive as many as twelve two pass amplifiers.","Made available in DSpace on 2011-05-07T13:36:21Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9211023.pdf: 7348524 bytes, checksum: 347ace819d09104eca6b7d4ffc46003c (MD5) Previous issue date: 1991","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:56:52Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:26:37-05:00 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":["AAI9211023","(UMI)AAI9211023","http://hdl.handle.net/2142/22327"],"dc:language":["eng"],"dc:rights":["Copyright 1991 Waldo, Robert Eugene"],"dc:subject":["Engineering, Aerospace","Engineering, Electronics and Electrical"],"dc:title":["On the performance characteristics of multiple pass hydrogen fluoride chemical laser master oscillator/power amplifiers"],"dc:type":["text"],"thesis:degree_discipline":["Aerospace Engineering"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:25:19Z"}