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Extension of the high frequency limit of time domain spectroscopy up to 200 THz using two-color pumped air plasma

By controlling the polarization of two-color 10-fs pulses, we enhanced the intensity of ultrabroadband coherent infrared pulses from two-color excited air plasma and achieved the time domain measurements in a spectral range up to 200 THz. This result without a time plate for two-color pulses implies the contribution of negative group velocity dispersion in plasma.