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April 17, 2026Optical and Quantum Electronics1 citationsOpen Access

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

VVV. VaičaitisMRMateusz RębarzSEShirly Espinoza

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

Abstract Tunable mid-infrared radiation in the range of 2. 06– 12\, m was generated in air via loosely focused two-color femtosecond laser pulses. The emission spectra and beam profiles confirm its origin as four-wave difference-frequency mixing in a low-density air plasma filament. Near phase-matching due to low air dispersion opens possibilities for efficient energy conversion at high powers.

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Cite This Study

Vaičaitis et al. (2026) studied this question.

synapsesocial.com/papers/69e1cecc5cdc762e9d857be6https://doi.org/10.1007/s11082-026-08794-4
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