Progress in high-power and high-intensity structured light

Harrison, Justin; Naidoo, Darryl; Forbes, Andrew; Dudley, Angela

doi:10.1080/23746149.2024.2327453

Advances in Physics: X

2024

DOI: 10.1080/23746149.2024.2327453

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Progress in high-power and high-intensity structured light

Justin Harrison,

Darryl Naidoo,

Andrew Forbes

et al.

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Cited by 2 publications

References 192 publications

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High-energy generation of arbitrary cylindrical vector vortex beams using a modified Mach–Zehnder interferometer

Harrison,

Mphuthi,

Mabena

et al. 2025

Appl. Opt.

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In this paper, we demonstrate the interferometric generation of high-energy pulsed vector vortex beams at arbitrary points on the higher-order Poincaré sphere. Scalar vortex beams with topological charges ℓ=1 and ℓ=2 were produced using fused silica spiral phase plates and a 1064 nm wavelength Gaussian laser source, delivering a pulse energy of 2.75 mJ at a frequency of 1 kHz with a pulse duration of 15.5 ns. A novel, to our knowledge, modified Mach–Zehnder interferometer was constructed to allow for arbitrary inter-modal phase and amplitude control of the vector vortex states across the surface of the Poincaré sphere, achieving pulse energies of 2.5 mJ and peak powers exceeding 160 kW. This marks the highest, to the best of our knowledge, pulse energy achieved for arbitrary higher-order vector vortex beams on the HOPS.

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High-energy generation of arbitrary cylindrical vector vortex beams using a modified Mach–Zehnder interferometer

Harrison,

Mphuthi,

Mabena

et al. 2025

Appl. Opt.

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Formation and conversion of high-peak-power structured beams by an Nd:YVO₄/Cr⁴⁺:YAG laser subject to tight-focusing off-axis pumping

Tuan,

Peng,

Liu

et al. 2024

Opt. Express

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A compact Nd:YVO4/Cr4+:YAG passively Q-switched laser in a near-hemispherical resonator is exploited to realize high-peak-power pulsed beams with high spatial degrees of freedom. Beneficial from the advantages of strong intracavity beam focusing as well as the point-like excitation condition for the proposed cavity design, various high-order structured pulses as coherent superpositions of multiple degenerate eigenmodes are stably generated under different off-axis pump schemes. Besides, by employing external-cavity astigmatic mode conversion (AMC), the oval-shaped and chessboard-like structured pulses under on-axis and 1D off-axis pumping are transformed into exotic modes with polygonal and figure-eight-shaped envelopes to further enrich the spatial complexity of the generated fields. With well-defined beam structures that are reconstructed using the analytical resonant wave functions of the resonator, the phase structures of AMC pulsed fields are numerically resolved to present a variety of singularity arrays. Experimental results reveal that the overall peak power of the on-axis and off-axis generated structured pulses respectively exceeds 600 W and 1 kW while maintaining good pulse train stability with peak-to-peak amplitude fluctuation to be less than 10% and 15%.

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Progress in high-power and high-intensity structured light

Cited by 2 publications

References 192 publications

High-energy generation of arbitrary cylindrical vector vortex beams using a modified Mach–Zehnder interferometer

High-energy generation of arbitrary cylindrical vector vortex beams using a modified Mach–Zehnder interferometer

Formation and conversion of high-peak-power structured beams by an Nd:YVO₄/Cr⁴⁺:YAG laser subject to tight-focusing off-axis pumping

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Progress in high-power and high-intensity structured light

Cited by 2 publications

References 192 publications

High-energy generation of arbitrary cylindrical vector vortex beams using a modified Mach–Zehnder interferometer

High-energy generation of arbitrary cylindrical vector vortex beams using a modified Mach–Zehnder interferometer

Formation and conversion of high-peak-power structured beams by an Nd:YVO4/Cr4+:YAG laser subject to tight-focusing off-axis pumping

Contact Info

Product

Resources

About

Formation and conversion of high-peak-power structured beams by an Nd:YVO₄/Cr⁴⁺:YAG laser subject to tight-focusing off-axis pumping