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

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

Published on: April 25, 2019

Abruptly autofocusing vortex beams.

Jeffrey A Davis¹, Don M Cottrell, David Sand

¹Department of Physics, San Diego State University, San Diego, California 92182-1233, USA. jdavis@sciences.sdsu.edu

|June 21, 2012

Summary

This summary is machine-generated.

Researchers created novel autofocusing beams that generate optical vortices at their focal point. These beams offer precise control over focal distance and numerical aperture, enabling sub-Airy beam diameters and 3D focus manipulation.

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Area of Science:

Optics and Photonics
Beam Shaping
Vortex Optics

Background:

Generating beams with controlled focal properties is crucial for applications like optical trapping and microscopy.
Existing methods for creating focused beams, such as Airy beams, have limitations in terms of focal distance control and spot size.

Purpose of the Study:

To develop abruptly autofocusing beams that generate optical vortices at the focus.
To provide explicit equations for phase-only Fourier masks for beam generation.
To demonstrate control over focal distance, numerical aperture, and three-dimensional (3D) focus manipulation.

Main Methods:

Derivation of phase-only Fourier masks for generating abruptly autofocusing beams.
Experimental characterization of focal distance and vortex patterns.
Comparison of focused beam diameter with Airy beams.

Main Results:

Successfully generated abruptly autofocusing beams with vortices at the focus.
Provided explicit equations for phase mask design, enabling control over focal distance and numerical aperture.
Demonstrated that the focused beam diameter can be smaller than that of a comparable Airy beam.
Showcased 3D manipulation of the focal spot by encoding additional optical elements onto the phase pattern.

Conclusions:

Abruptly autofocusing beams offer a versatile platform for generating controlled optical vortices.
The developed phase mask approach allows for precise tailoring of beam characteristics, including focal distance and numerical aperture.
These beams have potential applications in microscopy, optical manipulation, and laser fabrication due to their unique focusing properties and 3D controllability.