Fine 3D control of THz emission in air with dual femtosecond laser pre-pulses at tunnelling ionisation regime

作     者：Hsin-Hui Huang Takeshi Nagashima Kota Kumagai Yoshio Hayasaki Saulius Juodkazis Vladimir T.Tikhonchuk Koji Hatanaka 

作者机构：Optical Sciences CentreARC Training Centre in Surface Engineering for Advanced Materials(SEAM)School of ScienceSwinburne University of TechnologyHawthornVictoria 3122Australia Faculty of Science and EngineeringSetsunan University17-8 Ikeda-NakamachiNeyagawaOsaka572-8508Japan Center for Optical Research and Education(CORE)Utsunomiya University7-1-2 YotoUtsunomiya 321-8585Japan WRH Program International Research Frontiers Initiative(IRFI)Tokyo Institute of TechnologyNagatsuta-choMidori-kuYokohamaKanagawa 226-8503 Japan Laser Research CenterPhysics FacultyVilnius UniversitySauletekio Ave.1010223 VilniusLithuania Centre Lasers Intenses et ApplicationsUniversite de Bordeaux351Cours de la Liberation33405 Talence cedexFrance Extreme Light Infrastructure ERICELI Beamlines FacilityZa Radnicic 83525241 Dolni BřežanyCzech Republic Organization for Research Strategy and DevelopmentOkayama Univ.1-1-1 Tsushima-nakaKita-kuOkayama 700-8530Japan 

出 版 物：《Light(Advanced Manufacturing)》 (光（先进制造）（英文）)

年 卷 期：2024年第5卷第3期

页      面：62-74页

学科分类：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] 0803[工学-光学工程] 

基　　金：funded by programs 107-2112-M-001-014-MY3,110-2112-M-001-054(K.H.and H-H.H.) partly funded by the Australian Research Council Linkage LP 220100153 grant(S.J.).We are grateful to Prof.Eugene G.Gamaly for the critical comments 

主　　题：THz radiation Femtosecond laser induced breakdown Air breakdown spatio-temporal control 

摘      要：Emission of THz radiation from air breakdown at focused ultra-short fs-laser pulses(800 nm/35 fs)was investigated for the 3D spatio-temporal control where two pre-pulses are used before the *** laser pulse induced air breakdown forms a~120μm-long focal volume generate shockwaves which deliver a denser air into the focal region of the main pulse for enhanced generation of THz radiation at 0.1-2.5 THz spectral *** intensity of 162 pre-and main-pulses was at the tunnelling ionisation intensities(1-3)×10 W/cm and corresponded to sub-critical(transparent)plasma formation in *** analysis of THz radiation revealed that orientation of the air density gradients generated by pre-pulses and their time-position locations defined the ellipticity of the generated THz electrical *** rotational component of electric current is the origin of THz radiation.