ESA-Funded Project Advances Liquid-Crystal Vortex Coronagraph Technology for Exoplanet Detection
Researchers have made significant progress in developing and testing liquid-crystal vector vortex coronagraphs (VVCs) as part the ESA-funded SUPPPPRESS project, achieving improved manufacturing precision and reduced polarization leakage. The vortex coronagraph is a leading candidate for NASA's future Habitable Worlds Observatory, which aims to detect Earth-like planets around distant stars. These advances bring the technology closer to meeting the extreme contrast requirements (10^-10) needed for direct imaging of potentially habitable exoplanets.
The SUPPPPRESS project has demonstrated significant technical progress in manufacturing and testing liquid-crystal vector vortex coronagraphs, optical devices designed to block starlight and reveal faint exoplanets. Researchers achieved central singularities of 2 and 6 micrometers with patterning accuracies better than 1 degree root-mean-square error, and developed fabrication procedures producing polarization leakage as low as 3×10^-4 over a 10% bandwidth. A key innovation involves combining VVCs with multiple polarization gratings to diffract unwanted polarization leakage away from the science path. High-contrast laboratory tests of double-grating VVCs reached average contrasts of 2×10^-8 over small bandwidths and 6×10^-8 over 10% bandwidth, approaching the 10^-10 contrast needed for Earth-like planet detection. The team also successfully tested assembled liquid-crystal masks under space-environment conditions, validating their durability for space missions.
What's missing
The study does not discuss the timeline for integration into the Habitable Worlds Observatory, the cost implications of the manufacturing advances, or how this technology compares to competing coronagraph designs (band-limited coronagraphs, vortex coronagraphs using other materials, etc.). Additionally, the paper does not address the remaining technical hurdles needed to achieve the full 10^-10 contrast requirement in operational space conditions.
What different sources said
- arXiv astro-phCenter
SUPPPPRESS: Prototyping and testing liquid-crystal vector vortex coronagraphs with reduced polarization leakage
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