Ultrafast response of harmonic modelocked THz lasers

作     者：Feihu Wang Valentino Pistore Michael Riesch Hanond Nong Pierre-Baptiste Vigneron Raffaele Colombelli Olivier Parillaud Juliette Mangeney Jerome Tignon Christian Jirauschek Sukhdeep S.Dhillon Feihu Wang;Valentino Pistore;Michael Riesch;Hanond Nong;Pierre-Baptiste Vigneron;Raffaele Colombelli;Olivier Parillaud;Juliette Mangeney;Jerome Tignon;Christian Jirauschek;Sukhdeep S.Dhillon

作者机构：Laboratoire de Physique de l’Ecole Normale SuperieureENSUniversite PSLCNRSSorbonne UniversiteUniversite de ParisParisFrance Department of Electrical and Computer EngineeringTechnical University of MunichArcisstr.2180333 MunichGermany Centre de Nanosciences et de NanotechnologiesCNRSUniv.Paris-SudUniversite Paris-SaclayC2N-Orsay91405 OrsayCedexFrance Ⅲ-ⅤLab1 avenue Augustin Fresnel91767 PalaiseauFrance 

出 版 物：《Light(Science & Applications)》 (光（科学与应用)（英文版）)

年 卷 期：2020年第9卷第1期

页      面：1530-1537页

核心收录：

学科分类：0808[工学-电气工程] 080901[工学-物理电子学] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 080401[工学-精密仪器及机械] 0804[工学-仪器科学与技术] 0805[工学-材料科学与工程（可授工学、理学学位）] 0803[工学-光学工程] 0702[理学-物理学] 

基　　金：funding from the European Union FET-Open grant ULTRAQCL 665158 the German Research Foundation(DFG)within the Heisenberg program(JI 115/4-2) 

主　　题：passive harmonic harmonics 

摘      要：The use of fundamental modelocking to generate short terahertz(THz)pulses and THz frequency combs from semiconductor lasers has become a routine affair,using quantum cascade lasers(QCLs)as a gain ***,unlike classic laser diodes,no demonstrations of harmonic modelocking,active or passive,have been shown in THz QCLs,where multiple pulses per round trip are generated when the laser is modulated at the harmonics of the cavity’s fundamental round-trip ***,using time-resolved THz techniques,we show for the first time harmonic injection and mode-locking in which THz QCLs are modulated at the harmonics of the round-trip *** demonstrate the generation of the harmonic electrical beatnote within a QCL,its injection locking to an active modulation and its direct translation to harmonic pulse generation using the unique ultrafast nature of our ***,we show indications of self-starting harmonic emission,i.e.,without external modulation,where the QCL operates exclusively on a harmonic(up to its 15th harmonic)of the round-trip *** behaviour is supported by time-resolved simulations of induced gain and loss in the system and shows the importance of the electronic,as well as photonic,nature of *** results open up the prospect of passive harmonic modelocking and THz pulse generation,as well as the generation of low-noise microwave generation in the hundreds of GHz region.