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1、PHYSICALREVIEWA82,043817(2010)Coherentdual-combspectroscopyathighsignal-to-noiseratioI.Coddington,W.C.Swann,andN.R.NewburyNationalInstituteofStandardsandTechnology,325Broadway,Boulder,Colorado80305,USA(Received19January2010;published12October2010)Twocoherentfrequencycombsareusedtomeasurethefull
2、complexresponseofasampleinaconfigurationanalogoustoadispersiveFouriertransformspectrometer,infraredtimedomainspectrometer,oramultiheterodynelaserspectrometer.Thisdual-combspectrometerretainsthefrequencyaccuracyandresolutionofthereferenceunderlyingthestabilizedcombs.Wediscussthespecificdesignofour
3、coherentdual-combspectrometeranddemonstratethepotentialofthistechniquebymeasuringtheovertonevibrationofhydrogencyanide,centeredat194THz(1545nm).Wemeasurethefullynormalized,complexresponseofthegasovera9THzbandwidthat220MHzfrequencyresolutionyielding41,000resolutionelements.Theaveragespectralsign
4、al-to-noiseratio(SNR)overthe9THzbandwidthis2500forboththemagnitudeandphaseofthemeasuredspectralresponseandthepeakSNRis4000.ThispeakSNRcorrespondstoafractionalabsorptionsensitivityof0.05%andaphasesensitivityof250microradians.Asthespectralcoverageofcombsexpands,coherentdual-combspectroscopycouldp
5、rovidehigh-frequencyaccuracyandresolutionmeasurementsofacomplexsampleresponseacrossarangeofspectralregions.WorkofU.S.government,notsubjecttocopyright.DOI:10.1103/PhysRevA.82.043817PACSnumber(s):42.62.Fi,42.30.Rx,42.55.Wd,42.62.EhI.INTRODUCTIONdemonstratedoverspectralspansgreaterthan14THz[6],and
6、continuestoincrease,itisandwillremainlimitedcomparedFouriertransformspectroscopy(FTSorFTIR)haslongtoconventionalFTSwhichcan,invariousconfigurations,beenaworkhorsesystemforresearchandindustry.Over50covertheTHztotheuv.Therefore,whiledual-comb-basedyearssinceitsinception,FTSremainsrelevantandcontin
7、uesspectrometerswillnotsupplantconventionalFTS,theypro-tofindnewapplications,inpart,becauseofitscontinualvideanintriguingnewsolutionforapplicationsrequiringrefinement.Therecentadvancesinspectroscopyusingdualhighresolution,highlyaccu
