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arxiv: 2606.10760 · v1 · pith:IWTT7TTTnew · submitted 2026-06-09 · 🌌 astro-ph.IM · astro-ph.EP

SUPPPPRESS: Prototyping and testing liquid-crystal vector vortex coronagraphs with reduced polarization leakage

Rico Landman , David Doelman , Jeroen Rietjens , Iva Laginja , Pierre Baudoz , Kristien Peeters , Chris van Dijk , Yuki Nishie
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Yuta Watanabe Alexander Eigenraam Mario Vretenar Joost van den Born Rapha\"el Galicher Johan Mazoyer Axel Potier Mariya Krasteva Matteo Taccola Felix Bettonvil Frans Snik
This is my paper

Pith reviewed 2026-06-27 11:41 UTC · model grok-4.3

classification 🌌 astro-ph.IM astro-ph.EP
keywords vector vortex coronagraphliquid crystalpolarization leakagehigh contrast imagingexoplanet detectioncoronagraphspace instrumentation
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The pith

Double-grating VVC reaches 2×10^{-8} contrast with 3×10^{-4} leakage over 10% bandwidth

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

The paper reports fabrication and testing of liquid-crystal vector vortex coronagraphs intended for space telescopes searching for Earth-like planets. Manufacturing achieves small central singularities and sub-degree patterning accuracy while keeping polarization leakage to 3×10^{-4} over a 10% band. Assembly into double-grating configurations diffracts residual leakage out of the beam. Bench tests at THD2 show the double-grating version delivering average contrasts of 2×10^{-8} in narrow band and 6×10^{-8} across 10% bandwidth between 3 and 10 λ/D. The masks also passed space-environment qualification.

Core claim

Through optimized liquid-crystal polymer patterning and multi-grating assembly, vector vortex coronagraphs can be realized with polarization leakage of 3×10^{-4} over 10% bandwidth and 8×10^{-4} over 20% bandwidth. When combined as a double-grating VVC, these masks produce average contrasts of 2×10^{-8} over a small bandwidth and 6×10^{-8} over a 10% bandwidth between 3 and 10 λ/D on the THD2 bench, while surviving space-environment tests.

What carries the argument

The double-grating (or multi-grating) vector vortex coronagraph (mgVVC), which adds polarization gratings to the liquid-crystal VVC so that wavelength-dependent leakage is diffracted away from the science path.

If this is right

  • The achieved leakage levels allow the VVC to operate over 10-20% bandwidth while remaining compatible with off-axis telescope designs for the Habitable Worlds Observatory.
  • Individual components with 3×10^{-4} leakage can be assembled into mgVVCs without loss of the reported contrast.
  • Central singularities of 2 μm (charge 2) and 6 μm (charge 6) with <1° RMS patterning error are now manufacturable.
  • The masks retain performance after space-environment exposure, supporting direct use in flight hardware.
  • The 6×10^{-8} contrast over 10% bandwidth moves the technology closer to the 10^{-10} requirement for Earth-like planet detection.

Where Pith is reading between the lines

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

  • The same multi-layer twisted-retarder approach could be tested on other coronagraph architectures that suffer polarization leakage.
  • Further contrast gains will likely require combining the mgVVC with active wavefront control rather than mask improvements alone.
  • The small singularity sizes open the possibility of testing smaller inner working angles on the same manufacturing line.
  • Bandwidth extension beyond 20% would need explicit metrology of the retardance curves across the full science band.

Load-bearing premise

Performance measured on the THD2 bench will hold when the masks are placed in a full flight instrument exposed to launch vibrations, thermal cycling, and on-orbit wavefront errors.

What would settle it

A contrast measurement below 10^{-7} between 3 and 10 λ/D after the masks undergo simulated launch vibration or thermal cycling in a representative optical system.

read the original abstract

The vortex coronagraph is one of the most promising candidates for the Habitable Worlds Observatory (HWO) due to its excellent theoretical performance for an off-axis telescope. A practical realization can be achieved using liquid-crystal polymers to form a vector vortex coronagraph (VVC). Reaching the $10^{-10}$ contrast required for Earth-like planet detection is, however, limited by polarization leakage caused by wavelength-dependent deviations from half-wave retardance. This effect can be mitigated using multi-layer twisted retarders to minimize leakage, and by combining the VVC with multiple polarization gratings (mgVVC) to diffract the polarization leakage out of the science path. We present recent progress within the ESA-funded SUPPPPRESS project, which aims to advance the manufacturing, assembly, and testing of high-performance VVCs. Central singularities of 2 and 6 $\mu$m have been achieved for charge 2 and charge 6 VVCs, respectively, with patterning accuracies better than 1 degree root-mean-square error. Fabrication procedures have been developed to produce individual components with a polarization leakage of $3\times10^{-4}$ over a 10% bandwidth and $8\times10^{-4}$ over a 20% bandwidth. We also report on the development of assembly and alignment procedures for mgVVCs and their metrology. Furthermore, we present initial high-contrast tests at the THD2 bench for both regular VVCs and a double-grating VVC. The double-grating VVC reaches an average contrast between 3 and 10 $\lambda$/D of $2 \times 10^{-8}$ over a small bandwidth and $6\times 10^{-8}$ over a 10% bandwidth. Finally, we report on successful space-environment tests of the assembled liquid-crystal masks.

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

3 major / 2 minor

Summary. The manuscript reports progress in the ESA-funded SUPPPPRESS project on fabricating, assembling, and testing liquid-crystal vector vortex coronagraphs (VVCs) with multi-grating designs (mgVVC) to reduce polarization leakage for the Habitable Worlds Observatory. It details achievement of central singularities of 2 μm and 6 μm for charge-2 and charge-6 VVCs with <1° RMS patterning accuracy, component leakage of 3×10^{-4} over 10% bandwidth, THD2 bench contrast of 2×10^{-8} (small bandwidth) and 6×10^{-8} (10% bandwidth) between 3–10 λ/D for a double-grating VVC, and successful space-environment tests of assembled masks.

Significance. If the reported lab performance holds under more complete verification, the work provides concrete manufacturing and initial contrast benchmarks that advance practical VVC technology toward the 10^{-10} contrast needed for Earth-like exoplanet detection, particularly by quantifying leakage reduction via multi-layer retarders and polarization gratings.

major comments (3)
  1. [Abstract] Abstract: the central contrast claims of 2×10^{-8} (small bandwidth) and 6×10^{-8} (10% bandwidth) are stated without error bars, uncertainty estimates, or any description of data reduction steps, which directly limits assessment of whether these values support the performance claims.
  2. [Space-environment tests] Space-environment tests paragraph: the statement that tests 'were successful' provides no quantitative parameters (vibration spectrum, thermal range, number of cycles) or error budget connecting test outcomes to the measured contrast or leakage, leaving the link to flight conditions unquantified and load-bearing for the readiness claim.
  3. [High-contrast tests] High-contrast tests section: no comparison is presented between the THD2 bench contrasts and a full optical model that includes residual mid-spatial-frequency wavefront error (beyond bench correction) coupling into the leaked polarization term that the mgVVC is intended to diffract away.
minor comments (2)
  1. [Abstract] The 10% and 20% bandwidths should be specified with the central wavelength to allow direct comparison with other VVC literature.
  2. [Figure captions] Contrast curve figures should include the exact spectral bandwidth, integration time, and number of frames in the caption for reproducibility.

Simulated Author's Rebuttal

3 responses · 0 unresolved

We thank the referee for their constructive and detailed review. We address each major comment below, indicating where revisions will be made to strengthen the manuscript.

read point-by-point responses

  1. Referee: [Abstract] Abstract: the central contrast claims of 2×10^{-8} (small bandwidth) and 6×10^{-8} (10% bandwidth) are stated without error bars, uncertainty estimates, or any description of data reduction steps, which directly limits assessment of whether these values support the performance claims.

    Authors: We agree that uncertainty estimates and a brief description of data reduction would strengthen the abstract. In the revised manuscript we will add error bars derived from the standard deviation across repeated contrast measurements and include a short reference to the data reduction procedure (with full details retained in the methods section). revision: yes

  2. Referee: [Space-environment tests] Space-environment tests paragraph: the statement that tests 'were successful' provides no quantitative parameters (vibration spectrum, thermal range, number of cycles) or error budget connecting test outcomes to the measured contrast or leakage, leaving the link to flight conditions unquantified and load-bearing for the readiness claim.

    Authors: The tests followed standard ESA qualification protocols for space optics. We will expand the paragraph to report the vibration spectrum (random vibration to 20 g rms), thermal range (-40 °C to +80 °C, 20 cycles), and post-test metrology showing no degradation in leakage or contrast beyond the 10 % measurement uncertainty. A short error budget linking these results to the overall performance claim will also be added. revision: yes

  3. Referee: [High-contrast tests] High-contrast tests section: no comparison is presented between the THD2 bench contrasts and a full optical model that includes residual mid-spatial-frequency wavefront error (beyond bench correction) coupling into the leaked polarization term that the mgVVC is intended to diffract away.

    Authors: We agree a model comparison would be informative. The present manuscript prioritizes experimental results. In revision we will add a concise discussion that compares the measured contrasts to a simplified optical model incorporating residual mid-spatial-frequency wavefront error and the diffracted leakage term, demonstrating consistency with the mgVVC design under bench conditions. A full end-to-end model is noted as future work. revision: partial

Circularity Check

0 steps flagged

No circularity: experimental hardware report with direct measurements only

full rationale

The paper is a manufacturing, assembly, and laboratory testing report. All reported values (central singularities of 2 and 6 μm, patterning accuracy <1° rms, leakage of 3×10^{-4} over 10% bandwidth, contrasts of 2×10^{-8} and 6×10^{-8}) are presented as direct experimental outcomes from fabrication procedures and THD2 bench measurements. No derivations, fitted models, predictions, or equations appear in the provided text. No self-citations are used to justify load-bearing claims, and no ansatzes or uniqueness theorems are invoked. The derivation chain is empty; results do not reduce to inputs by construction.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The paper is an experimental instrumentation report and introduces no new free parameters, theoretical axioms, or invented entities; performance claims rest on standard optical metrology and contrast definitions.

axioms (1)
  • domain assumption Standard definitions of polarization leakage and raw contrast in coronagraphic imaging apply without additional systematic corrections beyond those stated.
    The reported leakage and contrast figures are interpreted using established metrics in high-contrast imaging.

pith-pipeline@v0.9.1-grok · 5948 in / 1326 out tokens · 25412 ms · 2026-06-27T11:41:10.598919+00:00 · methodology

discussion (0)

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Reference graph

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