We present spatially resolved measurements of energy deposition into atmospheric air by femtosecond laser filaments. Single filaments formed with varying laser pulse energy and pulsewidth were examined using longitudinal interferometry, sonographic probing, and direct energy loss measurements. We measure peak and average energy absorption of similar to 4 mu J/cm and similar to 1 mu J/ cm for input pulse powers up to similar to 6 times the critical power for self-focusing. (C) 2016 Optical Society of America
展开▼
