Transfer energy from nitrogen to argon enables 2-wayl cascaded lasing in air

Researchers from UCLA and the Max Born Institute have discovered a new mechanism that facilitates bidirectional cascaded lasing in atmospheric air by transferring energy from nitrogen (N2) to argon (Ar). This phenomenon, known as cavity-free lasing, allows for the generation of laser-like light without traditional optical cavities. The study, published in Physical Review Letters, reveals that the 3-photon resonant absorption of 261 nm photons in argon leads to cascaded superfluorescence, enabling this unique lasing effect. The researchers found that mixing argon with nitrogen produced similar results to those observed in ambient air, while other gases like oxygen did not yield the same effect. This mechanism could pave the way for backward air lasing, which has significant implications for remote sensing technologies. The team plans to further investigate the underlying physics of this mechanism, including quantum effects and ways to enhance the efficiency of backward lasing. The findings represent a significant advancement in the quest for efficient lasing in open air, a goal that has been pursued for over a decade.

- Researchers discovered a mechanism for bidirectional lasing in atmospheric air.

- The process involves energy transfer from nitrogen to argon through photon-mediated interactions.

- Cavity-free lasing allows for laser-like emissions without traditional optical cavities.

- The findings could enhance remote sensing technologies.

- Future research will explore the detailed physics and efficiency improvements of this mechanism.