Mid-infrared radiation generation in air by four-wave mixing of femtosecond laser pulses

Key Points

• The aim is to explore mid-infrared radiation generation in air using femtosecond laser pulses and four-wave mixing.
• Utilized loosely focused two-color femtosecond laser pulses.
• Analyzed emission spectra and beam profiles.
• Investigated low-density air plasma filaments for radiation generation.
• Tunable mid-infrared radiation was achieved in the range of 2.06 to 12 µm.
• Four-wave mixing was identified as the source of radiation generation.
• Efficiency of energy conversion was enhanced by low air dispersion.

Abstract