Generation of terahertz radiation from ionizing two-color laser pulses in Ar filled metallic hollow waveguides

Abstract

The generation of THz radiation from ionizing two-color femtosecond pulses propagating in metallic hollow waveguides filled with Ar is numerically studied. We observe a strong reshaping of the low-frequency part of the spectrum. Namely, after several millimeters of propagation the spectrum is extended from hundreds of GHz up to ~150 THz. For longer propagation distances, nearly single-cycle near-infrared pulses with wavelengths around 4.5 um are obtained by appropriate spectral filtering, with an efficiency of up to 0.25%.

6 pages, 3 figures

References in corpus (3)

• Ultrashort filaments of light in weakly-ionized, optically-transparent media
• Phase Matching of High-Order Harmonics in Hollow Waveguides
• Determination of the Carrier-Envelope Phase of Few-Cycle Laser Pulses with Terahertz-Emission Spectroscopy

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