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.
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 main-pulse.The laser pulse ...