Fabrication and Performance Testing of a Novel Deformable Mirror Based on a Magnetic Polymeric Membrane

Lussier, Renaud; Shooner, Thomas; Brousseau, Denis; Ritcey, Anna M.; Thibault, Simon

doi:10.1364/aoms.2020.of3b.3

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“…Magnetic fluid deformable mirrors (MFDMs) provide high surface quality, high precision, and are actuated using magnetic fields generated by low current carrying solenoids but they are limited in degree of freedom, [18][19][20] as they are constrained to operate horizontally under gravity. Mirrors coated with magnetostrictive material, 21,22 magnetic polymers, 23 and magnetic composite materials 24 eliminate the constraint problem but require more than one magnet or coiled actuators for precise actuation control. The magnetic membrane-based ALPAO mirrors 25 comes with significant development in the actuator count (∼3228) and is driven by low voltage but require high power per actuator (>1 W).…”

Section: Introductionmentioning

confidence: 99%

Demonstration of magnetic and light-controlled actuation of a photomagnetically actuated deformable mirror for wavefront control

et al. 2021

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Deformable mirrors (DMs) have wide applications ranging from astronomical imaging to laser communications and vision science. However, they often require bulky multichannel cables for delivering high power to their drive actuators. A low-powered DM, which is driven in a contactless fashion, could provide a possible alternative to this problem. We present a photomagnetically actuated deformable mirror (PMADM) concept, which is actuated in a contactless fashion by a permanent magnet and low-power laser heating source. We present the laboratory demonstration of prototype optical surface quality, magnetic control of focus, and COMSOL simulations of its precise photocontrol. The PMADM prototype is made of a magnetic composite (polydimethylsiloxane + ferromagnetic CrO 2 ) and an optical-quality substrate layer and is 30.48 mm × 30.48 mm × 175 μm in dimension with an optical pupil diameter of 8 mm. It deforms to 5.76 μm when subjected to a 0.12-T magnetic flux density and relaxes to 3.76 μm when illuminated by a 50-mW laser. A maximum stroke of 8.78 μm before failure is also estimated considering a 3× safety factor. Our work also includes simulation of astigmatism generation with the PMADM, a first step in demonstrating control of higher order modes. A fully developed PMADM may have potential application for wavefront corrections in vacuum and space environments.

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Section: Introductionmentioning

confidence: 99%

Demonstration of magnetic and light-controlled actuation of a photomagnetically actuated deformable mirror for wavefront control

et al. 2021

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Fabrication and Performance Testing of a Novel Deformable Mirror Based on a Magnetic Polymeric Membrane

Abstract: We report the development of a new family of deformable mirrors using soft polymeric membranes with embedded magnetic nanoparticles. We measure the performance metrics of such membranes under the influence of voice coil actuators.

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Demonstration of magnetic and light-controlled actuation of a photomagnetically actuated deformable mirror for wavefront control

Demonstration of magnetic and light-controlled actuation of a photomagnetically actuated deformable mirror for wavefront control

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