由氮到氩的共振三次谐波光子交换促成的空气中双向级联超荧光激光发射
Bidirectional cascaded superfluorescent lasing in air enabled by resonant third harmonic photon exchange from nitrogen to argon
AI总结：
本文揭示空气中氮到氩的三次谐波光子共振能量转移机制，实现双向双色级联超荧光激光，并经泵浦-探测实验确认其为SF而非ASE。
摘要：
大气空气中的无腔激光激发了旨在深入理解其底层物理机制的大量研究。在本Letter中，我们发现了一种新机制——由三次谐波光子介导的共振能量转移路径：强261 nm脉冲辐照氮分子，先使其发生三光子激发，进而在氩中形成粒子数反转——该机制可在大气空气中实现双向双色级联激光发射。通过泵浦-探测测量，我们确凿地表明，这种级联激光发射源于超荧光（SF），而非放大自发辐射（ASE）。这种能够产生双向多色相干脉冲的级联激光发射，为遥感应用开辟了更多可能性。
英文摘要：
Cavity-free lasing in atmospheric air has stimulated intense research towards fundamental understanding of underlying physical mechanisms. In this Letter, we identify a new mechanism -- third harmonic photon mediated resonant energy transfer pathway leading to population inversion in argon via initial three-photon excitation of nitrogen molecules irradiated by intense 261 nm pulses -- that enables bidirectional two-color cascaded lasing in atmospheric air. By making pump-probe measurements, we conclusively show that such cascaded lasing results from superfluorescence (SF) rather than amplified spontaneous emission (ASE). Such cascaded lasing with the capability of producing bidirectional multicolor coherent pulses opens additional possibilities for remote sensing applications.
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