02423nam 2200421 450 991070577860332120170614115109.0(CKB)5470000002452618(OCoLC)990059145(EXLCZ)99547000000245261820170614d2017 ua 0engurmn|||||||||txtrdacontentcrdamediacrrdacarrierInformation technology, sustained management attention to the implementation of FITARA is needed to better manage acquisitions and operations : testimony before the Subcommittees on Government Operations and Information Technology, Committee on Oversight and Government Reform, House of Representatives /statement of David A. Powner[Washington, D.C.] :United States Government Accountability Office,2017.1 online resource (26 pages) color illustrationsTestimony ;GAO-17-686T"For release ... June 13, 2017."Includes bibliographical references.Information technology, sustained management attention to the implementation of FITARA is needed to better manage acquisitions and operations Information technologyProcurementGovernment policyUnited StatesAdministrative agenciesInformation technologyUnited StatesProcurementGovernment purchasingUnited StatesManagementEvaluationInformation technologyProcurementGovernment policyAdministrative agenciesInformation technologyProcurement.Government purchasingManagementEvaluation.Powner David A.United States.Congress.House.Committee on Oversight and Government Reform.Subcommittee on Government Operations,United States.Congress.House.Committee on Oversight and Government Reform.Subcommittee on Information Technology,GPOGPOBOOK9910705778603321Information technology, sustained management attention to the implementation of FITARA is needed to better manage acquisitions and operations : testimony before the Subcommittees on Government Operations and Information Technology, Committee on Oversight and Government Reform, House of Representatives3533201UNINA02783nam 2200421 450 991080881620332120230112175225.09783736966260(electronic bk.)9783736976269(MiAaPQ)EBC7048821(Au-PeEL)EBL7048821(CKB)24276176900041(EXLCZ)992427617690004120230112d2022 uy 0engurcnu||||||||txtrdacontentcrdamediacrrdacarrierBroad-area laser bars for 1 kW-emission demonstrating increased efficiency and narrowed far field /Matthias M. Karow1st ed.Göttingen :Cuvillier Verlag,[2022]©20221 online resource (143 pages)Innovationen mit Mikrowellen und Licht. Forschungsberichte aus dem Ferdinand-Braun-Institut, Leibniz-Institut für Höchstfrequenztechnik ;v.70Print version: Karow, Matthias M. Broad-Area Laser Bars for 1 kW-Emission Göttingen : Cuvillier Verlag,c2022 9783736976269 Intro -- Abstract -- 1. Introduction -- 1.1. The global laser market -- 1.2. State of the art -- 1.3. Structure of this work -- 2. Theoretical Background -- 2.1. Concept and physics of broad-area laser bars -- 2.2. Definition and governing effects of beam quality in broad-area lasers -- 2.3. Strained diode-laser chips -- 2.4. Thermal aspects of diode-laser operation -- 3. Experimental Methods -- 3.1. Fabrication of broad-area laser bars -- 3.2. Characterization techniques -- 4. Diode-Laser Bars for Highly Efficient 1 kW-Emission -- 4.1. Vertical structure for high-efficiency operation -- 4.2. Thermal transient -- 4.3. Varied resonator length -- 4.4. Impact of the lateral design -- 4.5. Conclusions -- 5. Efficient 1 kW-Emitting Bars Exhibiting Narrow Far Field -- 5.1. Mechanical chip deformation (bar smile) -- 5.2. Emitter cross heating -- 5.3. Bar edge emitters -- 5.4. Emitter sub-structure -- 5.5. Conclusions -- 6. Conclusions and Outlook -- Appendices -- A. Beam-Path Calculation Using the Matrix Formalism -- B. Thermal Wavelength Dependence of Longitudinal Modes -- Bibliography -- Public ContributionsPublic Contributions -- Acknowledgements -- Biographical Sketch.Innovationen mit Mikrowellen und Licht. Forschungsberichte aus dem Ferdinand-Braun-Institut, Leibniz-Institut für HöchstfrequenztechnikEmission spectroscopyEmission spectroscopy.543.0858Karow Matthias M.1654670MiAaPQMiAaPQMiAaPQ9910808816203321Broad-area laser bars for 1 kW-emission4006645UNINA