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Atmospheric clearing of solid-particle debris using femtosecond filaments

Journal Article · · Physical Review Applied
 [1];  [2]
  1. University of Florida, Gainesville, FL (United States); University of Florida
  2. University of Florida, Gainesville, FL (United States)
Through nonlinear self-focusing, femtosecond pulses can propagate several kilometers beyond diffraction limits, forming an ionization channel in air known as a laser filaments. It has been demonstrated that in the wake of the filament, aerosols can be effectively cleared to improve the transmission of subsequent laser pulses or secondary light sources, pertinent to applications in atmospheric sensing. However, the current understanding of aerosol clearing is founded on interactions with droplets to simulate fogs and clouds and thus does not extend to solid particles or atmospheric debris. Using optical trapping, we isolate both graphite and silica microparticles and directly measure the subsequent displacement caused by the filament using time-resolved shadowgraphy. The shock wave from the filament is demonstrated to propel particles away from the filament, directly contributing to atmospheric debris clearing. Particles exposed to the laser light in either the intense filament core or the surrounding energy reservoir are axially displaced along the beam path. Furthermore, it is found that the optomechanical properties of the particle largely influence the axial displacement induced by laser exposure through mechanisms such as radiation pressure, mass ejection from ablation or optical damage, and particle deagglomeration.
Research Organization:
University of Florida, Gainesville, FL (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); Defense Threat Reduction Agency
Grant/Contract Number:
NA0004142
OSTI ID:
2427263
Alternate ID(s):
OSTI ID: 2473882
OSTI ID: 2574787
Journal Information:
Physical Review Applied, Journal Name: Physical Review Applied Journal Issue: 1 Vol. 22; ISSN 2331-7019
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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