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We present a single-shot detection method of terahertz-correlated secondharmonic generation in plasma-based sources by directly mixing an optical probeinto femtosecond laser-induced plasma filaments in air. The single-shot secondharmonic trace is obtained by measuring second harmonic generation on aconventional CCD with a spatio-temporally distorted probe beam. The systemshows a spectrometer resolution of 22 fs/pixel on the CCD and a true resolutionon the order of the probe pulse duration. With considerable THz peak electricfield strengths, this formalism can open the door to single-shot THz detectionwithout bandwidth limitations.

Single-Shot Local Measurement of Terahertz Correlated Second Harmonic Generation in Laser Air Plasma Filaments