The use of a high-order MEMS deformable mirror in the Gemini Planet Imager

Poyneer, Lisa; Bauman, Brian; Cornelissen, Steven; Isaacs, Joshua; Jones, Steven M.; Macintosh, Bruce; Palmer, David

doi:10.1117/12.876496

Cited by 12 publications

(8 citation statements)

References 19 publications

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“…In order to suppress waffle and reduce edge effects, during Integration and Test a modified Tweeter influence function filter was put in place. As discussed elsewhere, 22 the estimated phase is pre-compensated by a influence function filter to correctly shape the phase on the Tweeter. Due to the broadness of the Tweeter influence function, the effective Tweeter gain for high spatial frequencies 23 is very small.…”

Section: On-sky Resultsmentioning

confidence: 99%

On-sky performance during verification and commissioning of the Gemini Planet Imager's adaptive optics system

et al. 2014

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The Gemini Planet Imager instrument's adaptive optics (AO) subsystem was designed specifically to facilitate high-contrast imaging. It features several new technologies, including computationally efficient wavefront reconstruction with the Fourier transform, modal gain optimization every 8 seconds, and the spatially filtered wavefront sensor. It also uses a Linear-Quadratic-Gaussian (LQG) controller (aka Kalman filter) for both pointing and focus. We present on-sky performance results from verification and commissioning runs from December 2013 through May 2014. The efficient reconstruction and modal gain optimization are working as designed. The LQG controllers effectively notch out vibrations. The spatial filter can remove aliases, but we typically use it oversized by about 60% due to stability problems.

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Section: On-sky Resultsmentioning

confidence: 99%

On-sky performance during verification and commissioning of the Gemini Planet Imager's adaptive optics system

et al. 2014

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“…We found that there is a sweet spot for the separation between the DMs at an inter-DM Fresnel number of 576. Using this separation with 64x64actuator DMs, which are already commercially available, 13 allows us to achieve ∼ 10 −10 contrast averaged over the dark hole for an on-axis point source. This is also roughly where the best throughput is found.…”

Section: Discussionmentioning

confidence: 99%

Fast linearized coronagraph optimizer (FALCO) III: optimization of key coronagraph design parameters

Coker

Ruane²,

Riggs

et al. 2018

Space Telescopes and Instrumentation 2018: Optical, Infrared, and Millimeter Wave

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Deformable mirrors (DMs) are increasingly becoming part of nominal coronagraph designs, such as the hybrid Lyot coronagraph, in addition to their role counteracting optical aberrations. Previous studies have investigated the effects of the inter-DM Fresnel number on achievable contrast, throughput, and tip/tilt sensitivity for apodized coronagraphs augmented with DMs to suppress diffraction from struts and segment gaps. In this paper, we build upon that previous work by directly suppressing tip/tilt sensitivity with the controller, both for coronagraphs with and without apodizers. We also explore the effects of other important design parameters such as actuator density and tip/tilt controller weighting on performance. These comprehensive coronagraph design studies are enabled by the Fast Linearized Coronagraph Optimizer (FALCO) software toolbox, which provides rapid re-calculation of the DM response matrix for a variety of coronagraphs.

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“…While space-based telescopes avoid those atmospheric disturbances, their light-weighted and therefore floppy primary mirrors may induce aberrations which vastly reduce the telescope performance [1]. In terrestrial telescopes, the use of deformable mirrors to overcome the atmospheric seeing limit is well established [2,3], many types of deformable mirrors are commercially available [4,5].…”

Section: Introductionmentioning

confidence: 99%

Novel unimorph deformable mirror for space applications

Verpoort

Rausch

Wittrock

2017

International Conference on Space Optics — ICSO 2012

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We have developed a new type of unimorph deformable mirror, designed to correct for low-order Zernike modes. The mirror has a clear optical aperture of 50 mm combined with large peak-to-valley Zernike amplitudes of up to 35 μm. Newly developed fabrication processes allow the use of prefabricated super-polished and coated glass substrates. The mirror's unique features suggest the use in several astronomical applications like the precompensation of atmospheric aberrations seen by laser beacons and the use in woofer-tweeter systems. Additionally, the design enables an efficient correction of the inevitable wavefront error imposed by the floppy structure of primary mirrors in future large space-based telescopes. We have modeled the mirror by using analytical as well as finite element models. We will present design, key features and manufacturing steps of the deformable mirror.

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The use of a high-order MEMS deformable mirror in the Gemini Planet Imager

Cited by 12 publications

References 19 publications

On-sky performance during verification and commissioning of the Gemini Planet Imager's adaptive optics system

On-sky performance during verification and commissioning of the Gemini Planet Imager's adaptive optics system

Fast linearized coronagraph optimizer (FALCO) III: optimization of key coronagraph design parameters

Novel unimorph deformable mirror for space applications

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