Orbital angular momentum lasers

Forbes, Andrew; Mkhumbuza, Light; Feng, Liang

doi:10.1038/s42254-024-00715-2

Nat Rev Phys

2024

DOI: 10.1038/s42254-024-00715-2

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Orbital angular momentum lasers

Andrew Forbes,

Light Mkhumbuza,

Liang Feng

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Cited by 11 publications

References 150 publications

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640 nm High-Order Laguerre-Gaussian Modes with Controllable Topological Charge up to 42 from a Pr:YLF Laser with Intracavity Spherical Aberration

Zhang,

Qi,

Sheng

et al. 2024

ACS Photonics

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In this work, we demonstrate the generation of 640 nm high-order Laguerre-Gaussian (LG) modes with controllable order up to 42 from a Pr:YLF laser utilizing intracavity spherical aberration (SA). To the best of our knowledge, these constitute the highest order vortex beams in the visible spectral region, obtained from a simple laser cavity with strict SA management. By precisely adjusting the on-axis displacement of the laser output coupler, the angular index m of the generated LG modes could be varied in the range of 12−42. This work provides a flexible and robust method of generating visible vortex beams with tunable, high-index topological charge, which have potential use in spatial measurement, fluid dynamics and active debris removal applications.

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640 nm High-Order Laguerre-Gaussian Modes with Controllable Topological Charge up to 42 from a Pr:YLF Laser with Intracavity Spherical Aberration

Zhang,

Qi,

Sheng

et al. 2024

ACS Photonics

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Large quantum alphabets with a tiny footprint

Nothlawala,

Forbes

2024

Light Sci Appl

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High-dimensional quantum states are known to offer advantages over their two-dimensional qubit counterparts, but their preparation and manipulation has been bulky and cumbersome. Now, quantum state control has been demonstrated on-chip with a ~1 μm2 footprint and nm-scale features, producing up to eight-dimensional quantum states and ushering in a new route to large quantum information encoding on a small footprint.

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Metrology with a twist: probing and sensing with vortex light

Cheng,

Jiang,

Guo

et al. 2025

Light Sci Appl

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Optical metrology is a well-established subject, dating back to early interferometry techniques utilizing light’s linear momentum through fringes. In recent years, significant interest has arisen in using vortex light with orbital angular momentum (OAM), where the phase twists around a singular vortex in space or time. This has expanded metrology’s boundaries to encompass highly sensitive chiral interactions between light and matter, three-dimensional motion detection via linear and rotational Doppler effects, and modal approaches surpassing the resolution limit for improved profiling and quantification. The intricate structure of vortex light, combined with the integration of artificial intelligence into optical metrology, unlocks new paradigms for expanding measurement frameworks through additional degrees of freedom, offering the potential for more efficient and accurate sensing and metrological advancements. This review aims to provide a comprehensive overview of recent advances and future trends in optical metrology with structured light, specifically focusing on how utilizing vortex beams has revolutionized metrology and remote sensing, transitioning from classical to quantum approaches.

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Orbital angular momentum lasers

Cited by 11 publications

References 150 publications

640 nm High-Order Laguerre-Gaussian Modes with Controllable Topological Charge up to 42 from a Pr:YLF Laser with Intracavity Spherical Aberration

640 nm High-Order Laguerre-Gaussian Modes with Controllable Topological Charge up to 42 from a Pr:YLF Laser with Intracavity Spherical Aberration

Large quantum alphabets with a tiny footprint

Metrology with a twist: probing and sensing with vortex light

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