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Femtosecond Laser Filaments for Use in Sub-Diffraction-Limited Imaging and Remote Sensing
Published on: April 25, 2019
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Sensing with Femtosecond Laser Filamentation
Pengfei Qi1,2, Wenqi Qian1,2, Lanjun Guo1,2
1Institute of Modern Optics, Eye Institute, Nankai University, Tianjin 300350, China.
Sensors (Basel, Switzerland)
|September 23, 2022
Summary
Femtosecond laser filamentation enables remote sensing by analyzing molecular interactions. Controlling this nonlinear optical phenomenon presents challenges but offers unique sensing opportunities.
Area of Science:
- Nonlinear Optics
- Laser Physics
- Spectroscopy
Background:
- Femtosecond laser filamentation is a nonlinear optical phenomenon involving high-power ultrafast laser propagation.
- The intense fields within filaments can ionize and excite molecules, producing characteristic emissions.
- Filamentation occurs over meter to kilometer distances in transparent media, including the atmosphere.
Purpose of the Study:
- To review recent advances in sensing techniques utilizing femtosecond laser filamentation.
- To explore the fundamental physics, sensing methods, and applications of filament-based remote sensing.
- To discuss opportunities and challenges in controlling and sensing filamentation in complex environments.
Main Methods:
- Analysis of molecular ionization, breaking, and excitation by intense laser fields.
- Investigation of characteristic fingerprint emissions for molecular identification.
- Review of sensing and manipulating methods for laser filamentation.
Main Results:
- Filamentation provides a platform for studying strong-field molecule interactions.
- Characteristic emissions offer potential for remote sensing applications.
- High intensities within filaments can damage detectors and induce higher-order nonlinear effects.
Conclusions:
- Femtosecond laser filamentation presents significant opportunities for remote sensing.
- Sensing and controlling filamentation in complex environments remains challenging.
- Further research is needed to overcome challenges and expand applications.
