Efficient wavefront sensing for space-based adaptive optics

Sun, He; Kasdin, N. Jeremy; Vanderbei, Robert J.

doi:10.1117/1.jatis.6.1.019001

Cited by 11 publications

(4 citation statements)

References 32 publications

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“…Electric field estimation applies maximum likelihood estimation (MLE) methods, including batch process least squares regression [27][28][29], Kalman filtering [30] or extended Kalman filtering [31,32]. It collects measurements by introducing various DM sensing commands, and solves for the hidden electric field by minimizing the difference between measurements and model predictions as well as constraining the solution close to the electric field of the last step.…”

Section: Methods: Broadband Control and Reduced-dimensional System Id...mentioning

confidence: 99%

High-contrast integral field spectrograph (HCIFS): multi-spectral wavefront control and reduced-dimensional system identification

Sun¹,

Goun²,

Redmond³

et al. 2020

Opt. Express

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Any high-contrast imaging instrument in a future large space-based telescope will include an integral field spectrograph (IFS) for measuring broadband starlight residuals and characterizing the exoplanet's atmospheric spectrum. In this paper, we report the development of a high-contrast integral field spectrograph (HCIFS) at Princeton University and demonstrate its application in multi-spectral wavefront control. Moreover, we propose and experimentally validate a new reduced-dimensional system identification algorithm for an IFS imaging system, which improves the system's wavefront control speed, contrast and computational and data storage efficiency.

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Section: Methods: Broadband Control and Reduced-dimensional System Id...mentioning

confidence: 99%

High-contrast integral field spectrograph (HCIFS): multi-spectral wavefront control and reduced-dimensional system identification

Sun¹,

Goun²,

Redmond³

et al. 2020

Opt. Express

Self Cite

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“…CDEEP will also require fewer iterations to reach the lower required contrast and machine learning training on the ground will accelerate convergence. 49 We can calculate the estimated execution time for various procedures involved in an EFC iteration. 50 Table 2 reports the estimated time required for the Xiphos Q8S board to perform a single operation in nanoseconds.…”

Section: Computational Processing Requirementsmentioning

confidence: 99%

Design of the vacuum high contrast imaging testbed for CDEEP, the Coronagraphic Debris and Exoplanet Exploring Pioneer

Maier

Douglas²,

Kim

et al. 2020

Space Telescopes and Instrumentation 2020: Optical, Infrared, and Millimeter Wave

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The Coronagraphic Debris Exoplanet Exploring Payload (CDEEP) is a Small-Sat mission concept for high contrast imaging of circumstellar disks. CDEEP is designed to observe disks in scattered light at visible wavelengths at a raw contrast level of 10 −7 per resolution element (10 −8 with post processing). This exceptional sensitivity will allow the imaging of transport dominated debris disks, quantifying the albedo, composition, and morphology of these low-surface brightness disks. CDEEP combines an off-axis telescope, microelectromechanical systems (MEMS) deformable mirror, and a vector vortex coronagraph (VVC). This system will require rigorous testing and characterization in a space environment. We report on the CDEEP mission concept, and the status of the vacuum-compatible CDEEP prototype testbed currently under development at the University of Arizona, including design development and the results of simulations to estimate performance.

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“…"Blind" tests-where the DH residual intensity is comparable to the detector noise level over the WFS sampling time-can better assess LDFC's advantage over DM probing techniques in the (dark field) photon-starved regime. Adopting more advanced focal-plane wavefront sensing techniques such as EFC, Kalman filtering, or variants that optimize DM probing and integration time (Groff & Kasdin 2013;Groff et al 2016;Sun et al 2020) instead of speckle nulling may provide a more robust assessment of LDFC's advantages to state-of-the-art DM probing FPWFC methods.…”

Section: Future Tests Of Ldfcmentioning

confidence: 99%

Laboratory Demonstration of Spatial Linear Dark Field Control For Imaging Extrasolar Planets in Reflected Light

Currie

Pluzhnik

Guyon

et al. 2020

PASP

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Imaging planets in reflected light, a key focus of future NASA missions and extremely large telescopes, requires advanced wavefront control to maintain a deep, temporally correlated null of stellar halo-i.e., a dark hole (DH)at just several diffraction beam widths. Using the Ames Coronagraph Experiment testbed, we present the first laboratory tests of Spatial Linear Dark Field Control (LDFC) approaching raw contrasts (∼5 × 10 −7 ) and separations (1.5-5.2λ/D) needed to image Jovian planets around Sun-like stars with space-borne coronagraphs like WFIRST-CGI and image exo-Earths around low-mass stars with future ground-based 30 m class telescopes. In four separate experiments and for a range of different perturbations, LDFC largely restores (to within a factor of 1.2-1.7) and maintains a DH whose contrast is degraded by phase errors by an order of magnitude. Our implementation of classical speckle nulling requires a factor of 2-5 more iterations and 20-50 deformable mirror (DM) commands to reach contrasts obtained by spatial LDFC. Our results provide a promising path forward to maintaining DHs without relying on DM probing and in the low-flux regime, which may improve the duty cycle of high-contrast imaging instruments, increase the temporal correlation of speckles, and thus enhance our ability to image true solar system analogues in the next two decades.

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Efficient wavefront sensing for space-based adaptive optics

Cited by 11 publications

References 32 publications

High-contrast integral field spectrograph (HCIFS): multi-spectral wavefront control and reduced-dimensional system identification

High-contrast integral field spectrograph (HCIFS): multi-spectral wavefront control and reduced-dimensional system identification

Design of the vacuum high contrast imaging testbed for CDEEP, the Coronagraphic Debris and Exoplanet Exploring Pioneer

Laboratory Demonstration of Spatial Linear Dark Field Control For Imaging Extrasolar Planets in Reflected Light

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