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Updated: Oct 28, 2025
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The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
Published on: August 12, 2013
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Building hybridized 28-baseline pupil-remapping photonic interferometers for future high-resolution imaging.
Applied Optics
|July 15, 2021
Summary
We developed an eight-input photonic interferometer, the largest to date, for extremely large telescopes (ELTs). This integrated device achieves high stability and contrast for advanced astronomical observations.
Area of Science:
- Astronomy and Astrophysics
- Optical Engineering
- Photonics
Background:
- Single-mode photonic technologies offer scalability for interferometry compared to bulk optics.
- Extremely Large Telescope (ELT) generation requires advanced interferometric capabilities.
Purpose of the Study:
- To demonstrate the fabrication and characterization of a novel hybridized photonic interferometer with eight simultaneous inputs.
- To achieve the largest number of baselines (28) in a single integrated device for astronomical applications.
Main Methods:
- Fabrication of a monolithic device combining a 3D pupil remapper and an eight-port ABCD pairwise beam combiner.
- Integration of injection optics for telescope use.
- Characterization of the hybridized photonic interferometer's performance.
Main Results:
- Demonstrated a hybridized photonic interferometer with eight simultaneous inputs, forming 28 baselines.
- Achieved raw instrumental closure-phase stability down to 0.9° over $8\pi$ phase piston error.
- Obtained a detection contrast of approximately $6.5 \times 10^{-4}$ on an adaptive-optics-corrected 8 m telescope.
Conclusions:
- The Dragonfly prototype showcases advanced hybridization and packaging for on-sky use.
- This technology is suitable for high-contrast detection at small inner working angles, complementing coronagraphs.
- The device represents a significant advancement for future ELT instrumentation.
