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Updated: Nov 15, 2025

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

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Postfilament supercontinuum on 100 m path in air.

O Kosareva, N Panov, D Shipilo

|March 2, 2021

Summary

This summary is machine-generated.

High-intensity femtosecond laser pulses generated an unprecedentedly long light channel over 100 m. Spectral humps observed indicate the formation of a predictable train of ultrashort pulses.

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Area of Science:

Nonlinear optics
Ultrafast laser physics

Background:

Long-distance propagation of high-intensity laser pulses is crucial for applications.
Understanding filamentation and spectral broadening is key to controlling laser-matter interactions.

Purpose of the Study:

To investigate the long-distance propagation dynamics of femtosecond laser pulses.
To characterize the formation of spectral humps and their relation to pulse generation.

Main Methods:

Experimental propagation of 744 nm, 90 fs, 6 mJ laser pulses over 100 m.
Observation of filamentation and spectral broadening.
3D+time carrier-resolved numerical simulations of pulse propagation.

Main Results:

An unprecedentedly long high-intensity light channel (≥1 TW/cm²) was generated.
Continuous energy transfer to the infrared wing formed spectral humps up to 850 nm over a 20 m section.
Simulations confirmed spectral humps indicate the formation of a predictable train of femtosecond pulses.

Conclusions:

Long-distance filamentation can create extended high-intensity light channels.
Spectral humps are a signature of predictable femtosecond pulse train formation.
This phenomenon offers potential for controlled ultrashort pulse generation over long distances.