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Nonlinear self-guided propagation of intense long-wave infrared (LWIR) laserpulses is of significant recent interest owing to the high critical power forself-focusing collapse at long wavelengths. This promises transmission of veryhigh power in a single filament as opposed to beam breakup andmulti-filamentation. Here, using the most current picture of LWIR ionizationprocesses in air, we present extensive simulations showing that isolatedavalanche sites centered on aerosols can arrest self-focusing, providing aroute to self-guided propagation of moderate intensity LWIR pulses in outdoorenvironments.

Self-guiding of long-wave infrared laser pulses mediated by avalanche ionization