Abstract
Generation and application of sub-cycle midinfrared (MIR) pulses through a laser filament has been demonstrated. The fundamental and second harmonic of 30-fs Ti:sapphire amplifier output were focused into a gas and produced phase-stable broadband MIR pulses by using four-wave rectification through filamentation. The spectrum spread from 200 to 5500 cm-1, corresponding to about 3.5 octaves. The duration of the pulse was 6.9 fs, which was 0.63 times the period of the carrier frequency, 3000 cm-1. The pulses have been used for ultrafast pump-probe spectroscopy and high-speed attenuated total reflectance MIR spectroscopy.
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