Abstract

Terahertz (THz) radiation produced by ultrafast laser sources has recently become a hot topic with many innovative applications in molecular spectroscopy, medical imaging or homeland security [1] . Efficient THz emitters can be obtained by focusing into air a 2-colors femtosecond light pulse, composed of fundamental (FH) and second (SH) harmonics, in order to create a plasma spot that acts as a frequency converter [2] .

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