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Related Experiment Video

Updated: Jan 2, 2026

Investigation of Early Plasma Evolution Induced by Ultrashort Laser Pulses

Investigation of Early Plasma Evolution Induced by Ultrashort Laser Pulses

Published on: July 2, 2012

Intense attosecond pulses carrying orbital angular momentum using laser plasma interactions.

J W Wang¹, M Zepf^2,3, S G Rykovanov⁴

¹State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, 201800, Shanghai, China. wangjw@siom.ac.cn.

Nature Communications

|December 6, 2019

Summary

Intense extreme ultra-violet (XUV) attosecond pulses with orbital angular momentum (OAM) are naturally generated from non-vortex laser beams interacting with a target. This overcomes challenges in producing OAM in high-intensity XUV light.

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Last Updated: Jan 2, 2026

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Area of Science:

* Quantum optics
* Laser physics
* Attosecond science

Background:

* Light beams carrying orbital angular momentum (OAM) offer an extra degree of freedom for coherent light.
* Generating OAM beams in the extreme ultra-violet (XUV) at high intensities is challenging using conventional methods like phase plates or gratings.

Purpose of the Study:

* To theoretically and numerically demonstrate a novel method for generating intense XUV surface harmonics with OAM.
* To investigate the intrinsic dynamics of laser-matter interaction for OAM generation.

Main Methods:

* Theoretical and numerical modeling of intense circularly-polarized Gaussian laser beams interacting with a target at normal incidence.
* Utilizing the relativistic oscillating mirror mechanism for XUV harmonic generation.
* Analyzing the conversion of spin angular momentum to orbital angular momentum during harmonic generation.

Main Results:

* Intense surface harmonics carrying OAM are naturally produced from non-vortex laser beams.
* The process involves relativistic surface oscillations converting laser pulses to XUV radiation.
* Azimuthal and radial dependencies in harmonic generation facilitate the spin-to-orbital angular momentum conversion.

Conclusions:

* A new pathway for generating high-intensity XUV attosecond pulses with OAM has been demonstrated.
* This method bypasses the need for complex optical elements for OAM beam formation in the XUV spectrum.
* The findings open possibilities for advanced applications utilizing OAM-carrying XUV light.