High-Power Diode Lasers: How They Work and Where They Live · 2017-09-12 · Rob Williamson is...
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Madison Section Newsletter Volume 9, Number 2 February 2006 Serving IEEE Members of South Central Wisconsin High-Power Diode Lasers: How They Work and Where They Live Date/Time: ursday, February 16, 2006, 11:45 AM - 1:00 PM Speaker: Dr. Rob Williamson, Director of Marketing, Alfalight, Inc. Location: Rocky Rococo’s Pizza, 7952 Tree Lane (Madison Beltline Hwy. at Mineral Pt. Rd.), 608.829.1444 Menu: Pizza buffet, salad and soft drinks (cost $10.00, free for student members) RSVP: by February 13th to Les Schroeder via e-mail ([email protected]) or call 608.444.9144 Non-member guests are always welcome! High-power diode lasers are a key component in a broad range of applications, including telecommunications, industrial lasers for mate- rial processing, as well as in defense, medical, printing, display, and scientific applications. Recent research and development efforts have made tremendous improvements in many of the key performance characteristics of diode lasers, including power conversion efficiency, spatial brightness, and spectral quality. ese performance boosts have substantial impact on a wide range of systems pumped by high- power diode lasers. is talk will outline the properties and operating principles of high-power infrared diode lasers and the manufacturing processes used to make them, highlighting how these recent revolutionary performance improvements have been achieved. We will also explore the ar- chitectures of several systems incorporating diode lasers, including optical communications (CATV/FTTH), high power fiber lasers for material processing (cutting and welding), free-space communications, and kilowatt-class lasers. Rob Williamson is currently the Director of Marketing at Alfalight, a high-power diode laser manufacturer in Madison, Wisconsin. In his previous roles, he has led the development and marketing of high-speed optical communication devices, ultrastable lasers, and other optoelectronic instruments for telecommunication and industrial applications. Dr. Williamson has a Ph.D. in Physics from the University of Wisconsin - Madison and a B.S. in Physics from Caltech. He holds four patents, has published numerous papers and articles, and has led development efforts in the IEEE Ethernet Standards Committee. He is a member of IEEE Lasers and Electro-Optics Society, the American Physical Society, and Sigma Xi.
Transcript of High-Power Diode Lasers: How They Work and Where They Live · 2017-09-12 · Rob Williamson is...
Madison SectionNewsletter
Volume 9, Number 2 February 2006Serving IEEE Members of South Central Wisconsin
High-Power Diode Lasers: How They Work and Where They LiveDate/Time: Thursday,February16,2006,11:45AM-1:00PMSpeaker: Dr.RobWilliamson,DirectorofMarketing,Alfalight,Inc.Location: RockyRococo’sPizza,7952TreeLane(MadisonBeltlineHwy.atMineral
Pt.Rd.),608.829.1444Menu: Pizzabuffet,saladandsoftdrinks(cost$10.00,freeforstudentmembers)RSVP: byFebruary13thtoLesSchroederviae-mail([email protected])orcall608.444.9144
Non-member guests are always welcome!
High-powerdiodelasersareakeycomponentinabroadrangeofapplications,includingtelecommunications,industriallasersformate-rialprocessing,aswellasindefense,medical,printing,display,andscientificapplications.Recentresearchanddevelopmenteffortshavemadetremendousimprovementsinmanyofthekeyperformancecharacteristicsofdiodelasers,includingpowerconversionefficiency,spatialbrightness,andspectralquality.Theseperformanceboostshavesubstantialimpactonawiderangeofsystemspumpedbyhigh-powerdiodelasers.
Thistalkwilloutlinethepropertiesandoperatingprinciplesofhigh-powerinfrareddiodelasersandthemanufacturingprocessesusedtomakethem,highlightinghowtheserecentrevolutionaryperformanceimprovementshavebeenachieved.Wewillalsoexplorethear-chitecturesofseveralsystemsincorporatingdiodelasers,includingopticalcommunications(CATV/FTTH),highpowerfiberlasersformaterialprocessing(cuttingandwelding),free-spacecommunications,andkilowatt-classlasers.
RobWilliamsoniscurrentlytheDirectorofMarketingatAlfalight,ahigh-powerdiodelasermanufacturerinMadison,Wisconsin.Inhispreviousroles,hehasledthedevelopmentandmarketingofhigh-speedopticalcommunicationdevices,ultrastablelasers,andotheroptoelectronicinstrumentsfortelecommunicationandindustrialapplications.Dr.WilliamsonhasaPh.D.inPhysicsfromtheUniversityofWisconsin-MadisonandaB.S.inPhysicsfromCaltech.Heholdsfourpatents,haspublishednumerouspapersandarticles,andhasleddevelopmenteffortsintheIEEEEthernetStandardsCommittee.HeisamemberofIEEELasersandElectro-OpticsSociety,theAmericanPhysicalSociety,andSigmaXi.
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Let’s Not Overlook Standards
By Allison Ickowicz
Engineersdesigningproductsknowthattheymustcomplywithcer-tainformalstandardsifthefruitsoftheirlaboraretobewidelyused,butfewU.S.engineeringstudentsknowmuchaboutthem.TheIEEEhopestochangethat,thankstoeducationalmaterialsaboutstandardsitputupontheWebthismonth.Itsaimistoimpartinformationaboutstandardstouniversitystudents,facultymembers,andjustaboutanyoneelsewhomightbeinterested.
ThematerialwasdevelopedinresponsetocriteriasetbytheAccredi-tationBoardforEngineeringandTechnology(ABET),whichaccred-itsengineeringprogramsatU.S.universities.Criterion4ofthelatestguidelinesdocument,introducedin2000andknownasABET2000,saysthatstudentsmustbepreparedfor“engineeringpractice”throughacurriculumthatculminatesinamajordesignproject“incorporatingengineeringstandardsandmultiplerealisticconstraints.”TheIEEEisoneoftheengineeringorganizationsthatsitsontheABETboard,andthroughitsmembershelpsevaluatethequalityofuniversityprogramsinengineeringandengineeringtechnology.
Task ForceTomeetABET’srequirement,theIEEEin2003formedtheStan-dardsinEducationTaskForce,whichhasrepresentativesfromtheinstitute’sEducationalActivitiesBoardandStandardsAssociation,andfinancialsupportfromtheIEEEFoundation.
“Itiscrucialthatengineeringstudentslearnhowtousestandardsintheirclassesandseniordesignprojects,justasengineersworkinginindustryusestandardswhentheydesignproductsandservices,”saysIEEELifeFellowTedBickart,thecochairofthetaskforce.“Standardsareanessentialelementforengineeringandengineeringtechnologypracticeifwe’regoingtocreateproductsandprocessesthatwillservetheworldover.”Bickart,aretiredprofessorofelectricalengineering,isfromtheIEEEEducationalActivitiesBoard.
Overthepasttwoyears,thetaskforcehaswrittenanumberofdocu-mentsthatincludecasestudiesandthefirstofseveraltutorialsthattogethercoverthehistoryofstandardsandtheireffectonproducts,processes,anddesigns.Thetutorialsfocusonparticulartechnicalareas.Thefirstisaboutstandardsapplicabletomobiletelephony,andanotheronstandardsinpowersystemsistobecompletedinthenextfewmonths.Ultimately,BickartwouldliketoseeastandardstutorialdevelopedforeachoftheIEEE’stechnicalfieldsofinterest.
Aglossaryisalsoavailablethatdefinescommonstandardstermsandphrasesfoundinthetutorialsandcasestudies.Andareferenceguidelistsstandards-relatedterminologyalphabetically,includingacronymsandabbreviations,plusthenamesofstandards-developmentorgani-zations.ThesematerialscanallbeaccessedfromaWebsitecalledtheStandardsinEducationWebPortal.
TheU.S.NationalScienceFoundation(NSF)awardedaUS$100000grantlastMaytothetaskforceandtotwouniversitiestointro-ducethestandardsmaterialsandtheportalintheirundergraduateelectricalandcomputerengineeringandengineeringtechnologypro-gramsduringthe2005,2006,and2007academicyears.TheColo-radoSchoolofMines,inGolden,andDeVryUniversity,inNorthBrunswick,N.J.,arethetwoschoolschosen.
AtColorado,forexample,seniorsaregoingtotheportaltogetdetails
onstandardsbeforetheybeginresearchfortheirseniorprojects,accordingtoDougSutton,theschool’sindustryliaisonandalecturerintheschoolofengineering,andMelvinCapehart,aninstructorinelectricalengineering.InstructorsatDeVryhavebegunusingthematerialsinsophomoreandjuniorelectronicsandtelecommunica-tionsclasses,saysEricAddeo,aprofessorofelectricalengineeringandtelecommunications.
Thetaskforceisalsosendingthematerialstootheruniversities,notesBickart.Hisgroupislookingtopartnerwithotherengineeringsoci-eties,especiallythoseinvolvedinaccreditationactivities,sotheycandevelopsimilarteachingaidsforotherfields.IfColoradoandDeVryprovidegoodreviews,thestandardstaskforcewillapplyforanotherNSFgranttohelpitincorporatethematerialsfirstintoinstructioninotherschoolsintheUnitedStatesandCanadaandeventuallyintouniversitycurriculaworldwide.
TheStandardsinEducationWebPortalisatwww.ieee.org/stan-dardseducation.Thematerials,usefultoanyoneinterestedinlearningaboutstandards,areavailableatnocharge.FormoreinformationabouttheportaloractivitiesoftheStandardsinEducationTaskForce,[email protected].
New Technologies — “Shaken, Not Stirred”By Frederik Nebeker
WhenGoldfinger,thethirdJamesBondmovie,openedin1964,mostpeoplehadneverheardofalaser,eventhoughTedMaimanatHughesAircrafthadbuiltsuchadevicein1960.Anearlysceneinthemoviefeaturedanindustriallaser,whichAuricGoldfingerhelpfullyexplainedforBond—andthegratefulaudience.Thestudiowasproudofthisscene,boastinginapressreleasethatthemovie“issuretogivethelaseritsgreatestinternationalpublicityasascientificdevelopmentofgreatpowerandworthinthemodernworld.”(Thestudioistodaynodoubtproudofsomeclassiclinesinthatscene:“Chooseyournextwitticismcarefully,Mr.Bond,itmaybeyourlast”;andBond:“Doyouexpectmetotalk?”;Goldfinger:“No,Mr.Bond,Iexpectyoutodie.”)
In21filmsoverfourdecades,theBondmovieshaveintroducedmanynewtechnologiestothepublic.From Russia with Love(1963),thesecondBondmovie,showstheuseofabeeper,elevenyearsbeforeMotorola’sPageboy,thefirstcommerciallysuccessfulbeeperintheUnitedStates.Manypeoplelearnedforthefirsttimeaboutnumer-ousothercommunicationsdevicesfromBondmovies:thescramblerusedinThunderball(1965)utilizedaformofsecurecommunica-tions;avideophoneappearsinacarinYou Only Live Twice(1967);miniaturizedtwo-wayradio,intheformofalady’scompactinOn Her Majesty’s Secret Service(1969);videoconferencingisportrayedinNever Say Never Again(1983);afrequencyscannerisusedtolocatepoliceradio,inThe Living Daylights(1987);electronicmoneytrans-fer,inGoldenEye(1995);andusingacellphonetotakeapictureandtransmititelsewhere,inDie Another Day(2002).
TheAstonMartins,FerrarisandothercarsthatBondhasdrivenhaveattractedagreatdealofattention.Sohavevarioustechnologiesfound
invehicles,suchasaplan-position-indicatorscreenallowingBondtotrackaplantedtransmitterinGoldfinger(1964);cruisecontrolinatankertruckinLicence to Kill(1989);remotecontrolofaBMWinTomorrow Never Dies(1997);andthenavigationsysteminaspeed-boatthatallowsBondtotakeashortcutthroughLondoninThe World is not Enough(1999).
NewmilitarytechnologiesarepresentinmanyBondmovies.ThereisaninfraredscopeonasniperrifleinFrom Russia with Love(1963)andnight-visiongogglesinThe Living Daylights(1987).Asurveil-lancesatellitetrackssubmarineswithaninfraredcamera(using“heatsignaturerecognition”)inThe Spy Who Loved Me(1977).Twoimportantanti-radartechniques,bothdevelopedduringWorldWarII,areshown:jamminginMoonraker(1979)andantiradarcoating(ofastealthship)inTomorrow Never Dies(1997).WelearnaboutAWACSplanesinLicence to Kill(1989)andaboutterrain-follow-ingcruisemissiles(seeinghowtheguidancesystemfindsamatchbetweenstoredinformationandobservedterrain)inNever Say Never Again(1983).The Living Daylights(1987)showstheuseofaheads-updisplayforfiringmissiles,andThe World is not Enough(1999)showsasniperusingalasertofixatarget.
Notsurprisingly,securitysystemsoccurinmanyBondmovies.Dia-monds are Forever(1971)showsthesurveillancesysteminacasino,andvideosurveillanceplaysalargepartinOctopussy(1983).Licence to Kill(1989)includesapistolwith“signaturegrip,”allowingittobefiredbyaspecificpersononly.Severaltechniquesforaccesstosecureareasareshown:iris-patternmatchinginNever Say Never Again(1983),voice-matchinginGoldenEye(1995),andhandprint-match-inginDie Another Day(2002).
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ThefirstBondmovie,Dr. No(1962),containsanexplanationofaGeigercounter.A View to a Kill(1985)presentsasurveillancerobot.SeveralBondmovies,thefirstofthembeingFor Your Eyes Only(1981),showtheautomaticsearchingofanimagedatabase.Newconsumer-electronicsproductsappearinBondmovies,suchasthePulsardigitalwatchinLive and Let Die(1973),andaliquid-crystalTVscreeninOctopussy(1983).
TheBondmovieshavemadepeopleinterestedintechnology,butalongwiththepresentationofactualorfeasibledevicesisanadmix-tureoffantasytechnology.The“activecamouflage”thatmakesacarinvisibleinDie Another Day(2002);theRolexwristwatchthatpro-ducesamagneticfieldpowerfulenoughtodeflectabulletinLive and Let Die(1973);andtheelectronicdeviceimplantedintheneckthatmakesoneperson’svoicesoundlikeanotherperson’sinDiamonds are Forever(1971)arehardlyrealistic.ButmostofthetechnologyinBondmoviesisquiteauthentic—eventhesecounterexamplesaretheoreticallypossible.TheBondmovieshavebecomemoreandmorerealisticwithtime.Manyofthegadgetsthatamazedaudiencesinearlierdecades,suchaspagers,portablephones,trackingdevicesandminiaturevoice-recorders,havebecomecommonplace.
Frederik Nebeker is Senior Research Historian at the IEEE History Cen-ter at Rutgers University in New Brunswick, N.J. Visit the IEEE History Center’s Web page at: www.ieee.org/organizations/history_center.
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