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Updated: May 12, 2026
06:16
Femtosecond Laser Filaments for Use in Sub-Diffraction-Limited Imaging and Remote Sensing
Published on: April 25, 2019
Laser filamentation induced air-flow motion in a diffusion cloud chamber.
Haiyi Sun1, Jiansheng Liu, Cheng Wang
1State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, P.O. Box 800-211, Shanghai 201800, China.
Optics Express
|April 24, 2013
Summary
Numerical simulations reveal femtosecond laser filaments induce air-flow motion in diffusion cloud chambers. Higher laser chopping rates correlate with increased water condensation, confirming air flow
Area of Science:
- Fluid Dynamics
- Laser-Plasma Interactions
- Atmospheric Physics
Background:
- Femtosecond laser filaments generate localized heating, inducing air flow.
- Understanding laser-induced air motion is crucial for applications like cloud formation studies.
- Previous research suggests air flow significantly impacts water condensation and snow formation.
Purpose of the Study:
- To numerically simulate air-flow motion in a diffusion cloud chamber driven by femtosecond laser filaments.
- To investigate the influence of different laser chopping rates on air flow patterns and updraft velocity.
- To correlate simulated air flow with experimental observations of water condensation.
Main Methods:
- A two-dimensional numerical model was utilized.
- Femtosecond laser filaments were represented as a heat flux source.
- Simulations were performed for various chopping rates (1 Hz to 1 kHz).
Main Results:
- Simulated flow fields and updraft velocities closely matched experimental data for chopping rates up to 150 Hz.
- A quantitative discrepancy was observed at 1 kHz, though flow field patterns remained similar.
- Simulated results explain the experimental observation of increased water condensation/snow at higher chopping rates.
Conclusions:
- The method of laser filament heating critically influences laser-induced air flow.
- Air flow plays a significant role in water condensation and snow formation within cloud chambers.
- Numerical simulations provide valuable insights into complex laser-aerosol interactions.
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