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Updated: Jun 19, 2026

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry

Published on: August 12, 2013

High-order harmonic generation with an annular laser beam.

J Peatross, J L Chaloupka, D D Meyerhofer

|October 22, 2009

Summary

High-order harmonic generation was achieved using an annular laser beam. This method concentrates harmonics on the laser axis, enabling their separation from the fundamental laser light.

Area of Science:

Physics
Atomic, Molecular & Optical Physics

Background:

High-order harmonic generation (HHG) is a key process for producing extreme ultraviolet (XUV) and soft X-ray radiation.
Traditional HHG methods often face challenges in separating the generated harmonics from the fundamental laser field.

Purpose of the Study:

To demonstrate a novel method for efficient generation and spatial separation of high-order harmonics using an annular laser beam.
To enable selective filtering of harmonic radiation from the fundamental laser light.

Main Methods:

Generation of high-order harmonics utilizing a focused annular laser beam.
Exploiting the on-axis peaking of harmonics due to nonlinear effects and shorter wavelengths.
Employing an aperture to block the fundamental laser beam while allowing the on-axis harmonics to pass.

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Last Updated: Jun 19, 2026

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry

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Published on: August 12, 2013

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Main Results:

Successful generation of high-order harmonics with an annular laser beam.
Observed strong peaking of harmonic emission along the laser axis.
Demonstrated effective spatial separation of harmonics from the fundamental laser beam using an aperture.

Conclusions:

The annular laser beam geometry facilitates on-axis concentration of high-order harmonics.
This technique provides a straightforward method for isolating harmonic radiation, simplifying experimental setups.
The spatial separation capability opens avenues for advanced applications in XUV/soft X-ray spectroscopy and microscopy.