Intense vortical-field generation using coherent superposition of multiple vortex beams

Guo, Xinju; Zhang, Xiaomei; Xu, Dirui; Chen, Weixin; Guo, Yi; Lan, Ke; Shen, Baifei

doi:10.1038/s41598-023-28216-9

Cited by 4 publications

(1 citation statement)

References 51 publications

(58 reference statements)

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“…To calculate modal coefficients by the intensity moments method, a linear set of equations should be solved. So, we start with the intensity equation of the coherent field which can be represented by [27]:…”

Section: Basic Principlementioning

confidence: 99%

The measurement of complex modal coefficients of a superposed vortex beam based on intensity sampling methods

Mohagheghian,

Ghavami Sabouri

2024

J. Opt.

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In recent years, extracting information from superposed vortex beams has been a topic of intense study. In this paper, complex coefficients of various superpositions are measured in both simulation and experiment by proposing and implementing four different sampling methods. Superposed vortex beams are experimentally generated using a digital micromirror device, and recorded on a 2 f optical imaging setup. To extract both amplitude and phase values of modal coefficients, a single intensity frame of the beam is sampled in the form of concentric circles, sectors, random circles, and random squares. Considering just specified parts of the intensity instead of the whole to sample the pattern increases the speed of the modal coefficient extraction. Besides, a linear set of coherent equations is solved, and achievements are compared together. As a consequence, measuring both the amplitude and phase values of coefficients simultaneously can pave the way to enable high-capacity optical communication which is carried out in this research with better than 99% and 96% accuracy, respectively.

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Section: Basic Principlementioning

confidence: 99%

The measurement of complex modal coefficients of a superposed vortex beam based on intensity sampling methods

Mohagheghian,

Ghavami Sabouri

2024

J. Opt.

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10 GeV proton generation driven by 5 PW light spring pulses

Guo,

Zhang,

Shen

et al. 2024

High Pow Laser Sci Eng

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Proton acceleration in a near-critical-density gas driven by a light spring (LS) pulse with a helical structure in its intensity profile is investigated using three-dimensional particle-in-cell simulations. Compared with other pulse modes with the same laser power, such as the Gaussian pulse or the donut Laguerre–Gaussian (LG) pulse, the LS structure significantly enhances the peak intensity and drives a stronger longitudinal acceleration field and transverse focusing field. Both the high intensity and helical structure of the LS pulse contribute to the formation of a bubble-like structure with a fine electron column on the axis, which is critical for stable proton acceleration. Therefore, it is very promising to obtain ultra-high-energy protons using LS pulses with a relatively lower power. For example, by using LS pulses with the same power of 4.81 PW, the proton in the gas can be accelerated up to 8.7 GeV, and the witness proton can be accelerated to 10.6 GeV from 0.11 GeV, which shows the overwhelming advantage over the Gaussian and LG pulse cases.

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Laser repointing scheme for octahedral spherical hohlraums on the SGIII laser facility

et al. 2023

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The novel octahedral spherical hohlraum can provide an ideal and practical approach for the next generation of laser systems to support both direct and indirect drive to achieve predictable and reproducible fusion gain via multiple schemes. To demonstrate its advantage in a naturally high symmetry at a cylindrically configured laser facility, it requires to repoint the laser beams to approach as close as possible the ideal octahedral beam configuration with an injection angle (the angle between a beam and the normal direction of its laser entrance hole (LEH)) ranging from 50° to 60°. We report our investigation and experiment on the optimum repointing scheme at the SGIII facility, which uses 32 beams, with 8 beams entering each polar LEH at 49.5° and 55°, and 4 beams entering each equatorial LEH at 61.5° and 62.1°. It contains residual imbalance between the polar and equatorial beams, leading to an asymmetry dominated by the spherical harmonic Y20 mode, which can be remarkably reduced by the stronger backscatters of equatorial beams. Our experiment demonstrated the feasibility of the 32-beam optimum repointing scheme and generation of 175 eV under 86 kJ inside a 2.4-mm-radius octahedral hohlraum with 0.7-mm-radius LEHs, which provided a strong support for the later experiment on proof-of-concept of octahedral spherical hohlraum [Lan et al., Phys. Rev. Lett. 127, 245001 (2021)]. 2D simulations on LEH closure agree well with the observations. This work opens a novel way of realization of a quasi-spherical irradiation at a cylindrically configured laser facility without supplementary symmetry control.

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Intense vortical-field generation using coherent superposition of multiple vortex beams

Cited by 4 publications

References 51 publications

The measurement of complex modal coefficients of a superposed vortex beam based on intensity sampling methods

The measurement of complex modal coefficients of a superposed vortex beam based on intensity sampling methods

10 GeV proton generation driven by 5 PW light spring pulses

Laser repointing scheme for octahedral spherical hohlraums on the SGIII laser facility

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