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1、PHYSICALREVIEWLETTERSweekendingPRL100,013902(2008)11JANUARY2008CoherentMultiheterodyneSpectroscopyUsingStabilizedOpticalFrequencyCombsIanCoddington,WilliamC.Swann,andNathanR.NewburyNationalInstituteforStandardsandTechnology,Boulder,Colorado80305,USA(Received17October2007;published2January2
2、008)Thebroadband,coherentnatureofnarrow-linewidthfiberfrequencycombsisexploitedtomeasurethefullcomplexspectrumofamoleculargasthroughmultiheterodynespectroscopy.Wemeasuretheabsorptionandphaseshiftexperiencedbyeachof155000individualfrequency-comblines,spacedby100MHzandspanningfrom1495to1620nm
3、,afterpassingthroughhydrogencyanidegas.ThemeasuredphasespectrumagreeswiththeKramers-Kronigtransformationoftheabsorptionspectrum.Thistechniquecanprovideafullcomplexspectrumrapidly,overwidebandwidths,andwithhertz-levelaccuracy.DOI:10.1103/PhysRevLett.100.013902PACSnumbers:42.62.Fi,42.30.Rx,4
4、2.55.Wd,42.62.EhOpticalspectroscopyisacriticaltoolforourunder-InthisLetterwedemonstrateanalternateapproachofstandingofatomicandmolecularstructureandhasfurthermultiheterodynespectroscopy[10–13]thatallowsustoapplicationsrangingfromsemiconductorphysicstobi-resolveindividualcomblinesdirectlyby
5、down-convertingology.Spectroscopyremainssuchavaluabletoolinpartthemintoarfspectrum.Thismethodismoreeasilyscal-becauseithasevolvedwithnewmethods,suchastunableabletobothbroaderspectraandnarrowercombspacinglaserspectroscopyandFouriertransformspectroscopy,thanspatialdispersiontechniques.Here,w
6、eresolvetheprovidingeverlargerspectralcoverage,finerfrequencyphaseandamplitudeof155000individualcombmodesatresolutionandaccuracy[1].However,eventhebestcurrentaspacingof100MHzover15.5THz,limitedonlybythesystemsarelimitedto10MHzresolutionandaccuracysourcebandwidth.andoftenmeasureonlytheabsor
7、ptionwithoutinforma-Multiheterodynespectroscopy,pioneeredbyKeilmann,tiononopticalphaseshifts.StabilizedfrequencycombsvanderWeide,andco-workers,isaneleganttechniqueinofferadramaticimprovementinbroadbandspectroscopywhichasecondfrequencycombservesasalocaloscillat
