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$Femtosecond Laser Filaments for Use in Sub-Diffraction-Limited Imaging and Remote Sensing$

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High power laser propagation.

|February 19, 2010

Summary

Atmospheric effects like turbulence and scattering impact high power laser beams. Mid-infrared wavelengths are favored for atmospheric laser applications due to reduced scattering and turbulence effects.

Area of Science:

Atmospheric optics
Laser physics
High power laser applications

Background:

High power laser beams face atmospheric challenges including absorption, scattering, turbulence, thermal blooming, and gas breakdown.
These effects are crucial for selecting optimal laser systems for various applications.

Purpose of the Study:

To analyze the interplay of atmospheric effects on high power laser propagation.
To determine the optimal laser wavelength and temporal mode for high power atmospheric applications.

Main Methods:

Utilized simplified models to investigate atmospheric effects on laser beams.
Evaluated laser performance at seven wavelengths (0.34 µm to 10.6 µm) under sea-level conditions.

Main Results:

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Mid-infrared (mid-IR) wavelengths are advantageous under typical turbulence and aerosol scattering conditions.
At 10.6 µm, thermal blooming dominates due to molecular absorption.
Shorter wavelengths are significantly affected by turbulence-induced spreading and aerosol interactions.

Conclusions:

Laser wavelength selection is critical for mitigating atmospheric propagation losses.
Mid-IR lasers offer superior performance for high power atmospheric applications by balancing various detrimental effects.