2014/01/07 by J. K. Wahlstrand, N. Jhajj, E. W. Rosenthal +2
Engineering · Materials Science · Physics and Astronomy · #Acoustic wave #Femtosecond #Laser #Laser-Matter Interactions and Applications #Light beam #Microfluidic and Bio-sensing Technologies #Spatial frequency #Trapping #Ultrasound and Cavitation Phenomena #Wave propagation #Wavelength #physics.optics
paper · pdf · doi:10.1364/ol.39.001290
arxiv created 2014/01/07 · openalex publication_date 2014/02/26 · arxiv updated 2015/10/16 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We present time-resolved measurements of the gas acoustic dynamics following interaction of spatial single- and higher-mode 50 fs, 800 nm pulses in air at 10 Hz and 1 kHz repetition rates. Results are in excellent agreement with hydrodynamic simulations. Under no conditions for single filaments do we find on-axis enhancement of gas density; this occurs only with multifilaments. We also investigate the propagation of probe beams in the gas density profile induced by a single extended filament. We find that light trapping in the expanding annular acoustic wave can create the impression of on-axis guiding in a limited temporal window.