Abstract
A gas-filled hollow-core photonic crystal fiber is used to structure near-infrared ultrashort pulses and enable the generation and time-resolved detection of multi-terahertz radiation. Due to self-phase modulation, near-infrared pulses launched into the fiber experience spectral broadening characterized by the appearance of side lobes at the edges of the spectrum. Phase-locked terahertz generation between 10 and 18 terahertz is achieved by difference-frequency mixing of these spectral side lobes. This method allows for an implementation of time-resolved spectroscopy in the multi-terahertz range through the efficient production of near-infrared pulses with tailored spectra, without requiring ultrabroadband optical sources.
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