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基于飞秒钛宝石激光的新型单块光学频率梳及光频测量研究.docx

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基于飞秒钛宝石激光的新型单块光学频率梳及光频测量研究 Abstract Opticalfrequencycombshavebecomepowerfultoolsforprecisionmetrology,spectroscopy,andcommunicationsystems.Anewgenerationofsingle-chipopticalfrequencycombs,basedonfemtosecondtitaniumsapphirelasers,haverecentlyemerged,providingacompactandrobustplatformforawiderangeofapplications.Inthispaper,wepresentthedesignandcharacterizationofasingle-chipopticalfrequencycombbasedonafemtosecondtitaniumsapphirelaser,andinvestigateitsapplicationsinopticalfrequencymetrology. Introduction Opticalfrequencycombsaredevicesthatgenerateaseriesofevenlyspacedopticalfrequencies,withpreciseandaccuratecontrolofthefrequencyandphaseofeachcombline.Opticalfrequencycombshavebeenwidelyusedinavarietyoffields,suchastimeandfrequencymetrology,spectroscopy,andcommunications.Traditionalopticalfrequencycombsaretypicallybasedonmode-lockedlasers,whichrequirecomplexandbulkysetups,limitingtheirpracticalapplications.Inrecentyears,anewgenerationofopticalfrequencycombsbasedonfemtosecondtitaniumsapphirelasers,whicharecompactandrobust,haveemerged,providinganewplatformforpreciseandaccuratefrequencymetrology. Inthispaper,wepresentthedesignandcharacterizationofasingle-chipopticalfrequencycombbasedonafemtosecondtitaniumsapphirelaser.Thecombtoothspacingisdeterminedbytherepetitionrateofthefemtosecondlaser,typicallyintheGHzrange.Thefemtosecondlaserpulsesarecoupledintoahighfinesseopticalcavitytostabilizethecarrier-envelopeoffsetfrequency,whichdeterminesthepositionoftheopticalfrequencycomblinesrelativetoareferencefrequency.Theoutputopticalfrequencycombischaracterizedusingabeatmeasurementwithastableexternallaserfrequencyreference,andwithahighresolutionopticalspectrumanalyzer.Wealsoinvestigatetheapplicationsoftheopticalfrequencycombinopticalfrequencymetrology. Designandcharacterizationofthesingle-chipopticalfrequencycomb Thesingle-chipopticalfrequencycombisbasedonafemtosecondtitaniumsapphirelaser,whichgeneratesultrashortlaserpulsesinthefemtosecondrange.Thelaserpulsesarecoupledintoahighfinesseopti