Technological progress of a ferrofluid deformable mirror with tunable nominal optical power for high-contrast imaging

Lemmer, Aaron; Groff, Tyler D.; Kasdin, N. Jeremy; Echeverri, Daniel; Cleff, Isabel R.

doi:10.1117/12.2187321

Cited by 2 publications

(2 citation statements)

References 7 publications

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“…Many different actuator types have been implemented in deformable mirrors; including piezo, voicecoil, magnetic reluctance, MEMS, bimorph, and ferrofluid actuation. 9 One issue with DMs with high actuator counts is cabling. This issue is solved by a "photonic DM", 10,11 which uses light to address the deformable phase-sheet to activate individual activators, see Fig.…”

Section: Deformable Mirrorsmentioning

confidence: 99%

Review of high-contrast imaging systems for current and future ground-based and space-based telescopes III: technology opportunities and pathways

Snik

Absil

Baudoz

et al. 2018

Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III

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The Optimal Optical Coronagraph Workshop at the Lorentz Center in September 2017 in Leiden, the Netherlands gathered a diverse group of 25 researchers working on exoplanet instrumentation to stimulate the emergence and sharing of new ideas. This contribution is the final part of a series of three papers summarizing the outcomes of the workshop, and presents an overview of novel optical technologies and systems that are implemented or considered for high-contrast imaging instruments on both ground-based and space telescopes. The overall objective of high contrast instruments is to provide direct observations and characterizations of exoplanets at contrast levels as extreme as 10 −10 . We list shortcomings of current technologies, and identify opportunities and development paths for new technologies that enable quantum leaps in performance. Specifically, we discuss the design and manufacturing of key components like advanced deformable mirrors and coronagraphic optics, and their amalgamation in "adaptive coronagraph" systems. Moreover, we discuss highly integrated system designs that combine contrast-enhancing techniques and characterization techniques (like high-resolution spectroscopy) while minimizing the overall complexity. Finally, we explore extreme implementations using all-photonics solutions for ground-based telescopes and dedicated huge apertures for space telescopes.

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Section: Deformable Mirrorsmentioning

confidence: 99%

Review of high-contrast imaging systems for current and future ground-based and space-based telescopes III: technology opportunities and pathways

Snik

Absil

Baudoz

et al. 2018

Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III

View full text Add to dashboard Cite

show abstract

“…Due to these emphases, existing electrostrictive and capacitive DM technologies are designed to maximize speed, actuator density, and stroke; as a result, they are not always well matched to the space-based imaging problem. 8 First, the control laws typically used in focal-plane wavefront control do not utilize the full range of stroke current DM devices offer. (Electric-field conjugation 9 and stroke minimization 10 achieve the target contrast with low actuator stroke-on the order of ∼λ/10 or less.…”

Section: Rethinking Ao For Space-based Coronagraphy: Ferrofluid Deformentioning

confidence: 99%

Mathematical and computational modeling of a ferrofluid deformable mirror for high-contrast imaging

et al. 2016

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Deformable mirrors (DMs) are an enabling and mission-critical technology in any coronagraphic instrument designed to directly image exoplanets. A new ferrofluid deformable mirror technology for high-contrast imaging is currently under development at Princeton, featuring a flexible optical surface manipulated by the local electromagnetic and global hydraulic actuation of a reservoir of ferrofluid. The ferrofluid DM is designed to prioritize high optical surface quality, high-precision/low-stroke actuation, and excellent low-spatial-frequency performance-capabilities that meet the unique demands of high-contrast coronagraphy in a space-based platform. To this end, the ferrofluid medium continuously supports the DM facesheet, a configuration that eliminates actuator print-through (or, quilting) by decoupling the nominal surface figure from the geometry of the actuator array. The global pressure control allows independent focus actuation. In this paper we describe an analytical model for the quasi-static deformation response of the DM facesheet to both magnetic and pressure actuation. These modeling efforts serve to identify the key design parameters and quantify their contributions to the DM response, model the relationship between actuation commands and DM surface-profile response, and predict performance metrics such as achievable spatial resolution and stroke precision for specific actuator configurations. Our theoretical approach addresses the complexity of the boundary conditions associated with mechanical mounting of the facesheet, and makes use of asymptotic approximations by leveraging the three distinct length scales in the problem-namely, the low-stroke (∼nm) actuation, facesheet thickness (∼mm), and mirror diameter (∼cm). In addition to describing the theoretical treatment, we report the progress of computational multiphysics simulations which will be useful in improving the model fidelity and in drawing conclusions to improve the design.

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Technological progress of a ferrofluid deformable mirror with tunable nominal optical power for high-contrast imaging

Cited by 2 publications

References 7 publications

Review of high-contrast imaging systems for current and future ground-based and space-based telescopes III: technology opportunities and pathways

Review of high-contrast imaging systems for current and future ground-based and space-based telescopes III: technology opportunities and pathways

Mathematical and computational modeling of a ferrofluid deformable mirror for high-contrast imaging

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