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Updated: Oct 20, 2025

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

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Published on: April 25, 2019

Squared Focal Intensity Distributions for Applications in Laser Material Processing.

Henrike Schlutow¹, Ulrike Fuchs¹, Frank A Müller²

¹Asphericon GmbH, Stockholmer Str. 9, 07747 Jena, Germany.

Materials (Basel, Switzerland)

|September 10, 2021

Summary

This summary is machine-generated.

A new refractive element shapes femtosecond laser beams for precise material processing. This innovation enhances surface structuring efficiency and control for micro- and nano-scale applications.

Keywords:

beam shaping fs-laser laser surface structuring laser-induced periodic surface structures micro-channels squared top-hat

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Published on: November 22, 2019

Area of Science:

Laser Physics and Optics
Materials Science and Engineering
Nanotechnology

Background:

Precise control over laser-material interactions is crucial for advanced processing.
Tailored laser beam intensity profiles enhance processing outcomes.
Gaussian beams from femtosecond lasers require modification for specific applications.

Purpose of the Study:

To introduce and evaluate a novel refractive beam-shaping element.
To demonstrate its capability in converting Gaussian laser beams into desired intensity profiles.
To validate its effectiveness in femtosecond laser material processing.

Main Methods:

Development of a refractive beam-shaping element.
Utilizing a femtosecond laser source.
Performing surface structuring experiments on stainless steel (micro- and nano-scale).
Employing a conventional f-Theta lens for beam delivery.
Conducting beam profile measurements and numerical simulations.

Main Results:

The beam-shaping element successfully generated different squared intensity distributions.
Experimental surface structuring results on stainless steel showed good agreement with simulations.
Significant reduction in processing time for nano-structuring was achieved.
Controlled ablation geometry was demonstrated during micro-channel fabrication.

Conclusions:

The novel refractive beam-shaping element is suitable for femtosecond laser material processing.
It enables precise control over laser-material interactions.
The technology offers improved efficiency and new possibilities for micro- and nano-fabrication.