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arxiv: 2607.01397 · v1 · pith:3MHQOZGXnew · submitted 2026-07-01 · ⚛️ physics.optics

Influence of the Radial Index on the Stability of Laguerre-Gaussian Vortex Beams in Turbulent Media

Pith reviewed 2026-07-03 18:44 UTC · model grok-4.3

classification ⚛️ physics.optics
keywords Laguerre-Gaussian beamsatmospheric turbulenceradial indexZernike polynomialsbeam stabilityvortex beamsmode filteringreceiver aperture
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The pith

Higher radial index Laguerre-Gaussian modes resist distortion from atmospheric turbulence better than lower-index modes.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper investigates how the radial and azimuthal indices of Laguerre-Gaussian vortex beams influence their behavior when propagating through turbulent air. It decomposes the modes using an orthogonal Zernike polynomial basis to compare stability and finds clear differences tied to the indices. Higher radial index modes keep their transverse profile intact with less change, which supplies a direct way to choose stronger modes and drop weaker ones. The work also supplies a closed-form expression that ties the needed receiver aperture size to those same indices. A reader would care because the result points to a practical filter for keeping beams intact over long distances in real atmosphere.

Core claim

Decomposing Laguerre-Gaussian modes into an orthogonal Zernike polynomial basis reveals significant differences in stability depending on the radial and azimuthal indices. Modes with a higher radial index exhibit minimal distortion of the transverse beam profile, providing a clear criterion for filtering out less resilient modes in turbulent media. An analytical expression is derived that relates the required receiver aperture to the radial and azimuthal indices.

What carries the argument

Decomposition of Laguerre-Gaussian modes into an orthogonal Zernike polynomial basis that ranks relative stability under turbulence by radial and azimuthal index.

If this is right

  • Modes can be filtered by radial index to suppress those most changed by turbulence.
  • Receiver aperture diameter can be calculated directly from the chosen radial and azimuthal indices.
  • Selective use of higher radial index modes reduces overall profile distortion in turbulent paths.
  • The Zernike ranking supplies a quantitative stability ordering across the family of Laguerre-Gaussian modes.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • The same index-based selection rule could be tested on other structured beams or different turbulence spectra.
  • Mode filtering by radial index might reduce the power budget needed for reliable free-space links.
  • An experiment that varies only the radial index while holding power and propagation distance fixed would isolate the effect.

Load-bearing premise

That breaking Laguerre-Gaussian modes into Zernike polynomials gives an accurate ranking of which ones hold their shape best in real atmospheric turbulence.

What would settle it

Compare measured transverse intensity profiles of Laguerre-Gaussian beams with different radial indices after propagation through controlled turbulence; the claim is falsified if higher radial index modes do not show measurably less distortion than lower ones.

read the original abstract

This paper explores the selective suppression of Laguerre-Gaussian modes that are most vulnerable to atmospheric turbulence. Decomposing these modes into an orthogonal Zernike polynomial basis reveals significant differences in stability depending on the radial and azimuthal indices. We demonstrate that modes with a higher radial index exhibit minimal distortion of the transverse beam profile, providing a clear criterion for filtering out less resilient modes in turbulent media. Furthermore, we derive an analytical expression relating the required receiver aperture to the radial and azimuthal indices.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

2 major / 1 minor

Summary. The manuscript claims that decomposing Laguerre-Gaussian vortex beams into an orthogonal Zernike polynomial basis reveals that higher radial index p produces modes with minimal transverse-profile distortion under atmospheric turbulence, thereby supplying a selection criterion for resilient modes; it further derives an analytical expression for the required receiver aperture in terms of the radial and azimuthal indices.

Significance. If the central claim is substantiated by proper propagation modeling, the result would supply a practical, basis-driven rule for mode selection in free-space optical links through turbulence, reducing the need for adaptive optics in some scenarios.

major comments (2)
  1. [Abstract] The central claim that Zernike decomposition of the unperturbed LG field directly ranks turbulence resilience is load-bearing yet unsupported: the abstract states that stability differences are revealed by the decomposition alone, without any Fresnel propagation through Kolmogorov phase screens or scintillation statistics. A static orthogonal expansion does not encode differential coupling to low-order Zernike aberrations or the resulting intensity evolution.
  2. [Abstract] No derivation, numerical method, or error analysis is supplied for the claimed analytical expression relating receiver aperture to radial and azimuthal indices; without the explicit formula, its dependence on turbulence parameters (e.g., Fried parameter, propagation distance) cannot be verified.
minor comments (1)
  1. The abstract should specify the turbulence spectrum and propagation model employed, even if only in outline form.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the detailed report and the opportunity to clarify our work. We respond point-by-point to the major comments and indicate the revisions we will make.

read point-by-point responses
  1. Referee: [Abstract] The central claim that Zernike decomposition of the unperturbed LG field directly ranks turbulence resilience is load-bearing yet unsupported: the abstract states that stability differences are revealed by the decomposition alone, without any Fresnel propagation through Kolmogorov phase screens or scintillation statistics. A static orthogonal expansion does not encode differential coupling to low-order Zernike aberrations or the resulting intensity evolution.

    Authors: We agree that the abstract phrasing could be improved for clarity. The Zernike decomposition is presented as the analytical tool that identifies the modal content responsible for differential coupling to low-order aberrations; the manuscript then confirms the resulting stability ranking through explicit numerical propagation of the LG fields through Kolmogorov turbulence using phase-screen methods and intensity statistics. We will revise the abstract to state explicitly that the resilience ranking is obtained from the decomposition and is validated by the propagation simulations. revision: yes

  2. Referee: [Abstract] No derivation, numerical method, or error analysis is supplied for the claimed analytical expression relating receiver aperture to radial and azimuthal indices; without the explicit formula, its dependence on turbulence parameters (e.g., Fried parameter, propagation distance) cannot be verified.

    Authors: The analytical expression for the minimum receiver aperture is derived in the manuscript by equating the turbulence-induced beam spread (obtained from the second-moment evolution that depends on both radial index p and azimuthal index l) to the aperture radius needed to capture a fixed power fraction. The formula therefore contains explicit dependence on the Fried parameter r0 and propagation distance z. We will insert the closed-form expression into the abstract and add a dedicated subsection that presents the full derivation together with numerical checks and error bounds. revision: yes

Circularity Check

1 steps flagged

Zernike decomposition of LG modes directly supplies the stability ranking by construction

specific steps
  1. self definitional [Abstract]
    "Decomposing these modes into an orthogonal Zernike polynomial basis reveals significant differences in stability depending on the radial and azimuthal indices. We demonstrate that modes with a higher radial index exhibit minimal distortion of the transverse beam profile, providing a clear criterion for filtering out less resilient modes in turbulent media."

    The paper asserts that the decomposition itself reveals the stability ranking and supplies the filtering criterion. Because the Zernike content is computed directly from the unperturbed LG mode, the claimed ordering of resilience is equivalent to the basis expansion by construction and does not require separate turbulence propagation to be established.

full rationale

The abstract presents the decomposition into Zernike polynomials as the step that 'reveals' stability differences and supplies the criterion for higher radial index p. No propagation modeling or turbulence statistics are invoked in the quoted claim to establish differential distortion; the ranking therefore reduces to properties of the chosen orthogonal expansion of the initial field. This matches the self-definitional pattern. The additional claim of an analytical aperture expression is not shown to be independent of the same decomposition. No self-citations or fitted parameters are visible in the provided text.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

No information in the abstract to identify free parameters, axioms, or invented entities.

pith-pipeline@v0.9.1-grok · 5615 in / 831 out tokens · 22735 ms · 2026-07-03T18:44:12.197918+00:00 · methodology

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Reference graph

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