&lt;title&gt;Advanced phase-contrast techniques for wavefront sensing and adaptive optics&lt;/title&gt;

Vorontsov, Mikhail A.; Justh, Eric W.; Beresnev, L. A.

doi:10.1117/12.407492

Cited by 8 publications

(4 citation statements)

References 25 publications

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“…A Zernike (a.k.a. phasecontrast) WFS [12][13][14] has been demonstrated to provide near ideal sensitivity to such wavefront changes in a coronagraph instrument and thus is our preferred sensing method. [15][16][17]…”

Section: Glass Substratementioning

confidence: 99%

Dual purpose lyot coronagraph masks for simultaneous high-contrast imaging and high-resolution wavefront sensing

Ruane,

Wallace,

Riggs

et al. 2023

Techniques and Instrumentation for Detection of Exoplanets XI

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Directly imaging Earth-sized exoplanets with a visible-light coronagraph instrument on a space telescope will require a system that can achieve approximately 10−10 raw contrast and maintain it for the duration of observations (on the order of hours or more). We are designing, manufacturing, and testing Dual Purpose Lyot coronagraph (DPLC) masks that allow for simultaneous wavefront sensing and control using out-of-band light to maintain high contrast in the science focal plane. Our initial design uses a tiered metallic focal plane occultor to suppress starlight in the transmitted coronagraph channel and a dichroic-coated substrate to reflect out-of-band light to a wavefront sensing camera. The occultor design introduces a phase shift such that the reflected channel is a Zernike wavefront sensor. The dichroic coating allows higher-order wavefront errors to be detected which is especially critical for compensating for residual drifts from an actively-controlled segmented primary mirror. A second-generation design concept includes a metasurface to create polarization-dependent phase shifts in the reflected beam, which has several advantages including an extended dynamic range. We will present the focal plane mask designs, characterization, and initial testing at NASA’s High Contrast Imaging Testbed (HCIT) facility

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Section: Glass Substratementioning

confidence: 99%

Dual purpose lyot coronagraph masks for simultaneous high-contrast imaging and high-resolution wavefront sensing

Ruane,

Wallace,

Riggs

et al. 2023

Techniques and Instrumentation for Detection of Exoplanets XI

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show abstract

“…However, CPCS has no problem of 2π loss, which is not trivial in LSI. [18] What is more, CPCS is easier to fabricate than the pyramid sensor, for its key components have been commonly used for years.…”

Section: Simulation and Analysismentioning

confidence: 99%

Wavefront sensing based on phase contrast theory and coherent optical processing

Huang¹,

Bian²,

Zhou³

et al. 2016

Chinese Phys. B

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A novel wavefront sensing method based on phase contrast theory and coherent optical processing is proposed. The wavefront gradient field in the object plane is modulated into intensity distribution in a gang of patterns, making highdensity detection available. By applying the method, we have also designed a wavefront sensor. It consists of a classical coherent optical processing system, a CCD detector array, two pieces of orthogonal composite sinusoidal gratings, and a mechanical structure that can perform real-time linear positioning. The simulation results prove and demonstrate the validity of the method and the sensor in high-precision measurement of the wavefront gradient field.

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“…In short, a ZWFS shifts the phase of the core of the stellar point spread function (PSF), and as a result converts phase errors into intensity variations in a pupil image at the WFS camera. [18][19][20][21][22] The ZWFS technique has been successfully demonstrated on groundbased AO systems, [23][24][25][26] and recent simulations 27 and laboratory experiments 28 have achieved picometer sensitivity. The Roman Space Telescope CGI will make use of a spatially filtered version of the ZWFS to sense and correct low-order wavefront errors using light reflected off the coronagraph focal plane mask (FPM).…”

Section: Introductionmentioning

confidence: 99%

Wavefront sensing and control in space-based coronagraph instruments using Zernike’s phase-contrast method

Ruane

Wallace

Steeves

et al. 2020

J. Astron. Telesc. Instrum. Syst.

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Future space telescopes with coronagraph instruments will use a wavefront sensor (WFS) to measure and correct for phase errors and stabilize the stellar intensity in high-contrast images. The HabEx and LUVOIR mission concepts baseline a Zernike wavefront sensor (ZWFS), which uses Zernike's phase contrast method to convert phase in the pupil into intensity at the WFS detector. In preparation for these potential future missions, we experimentally demonstrate a ZWFS in a coronagraph instrument on the Decadal Survey Testbed in the High Contrast Imaging Testbed facility at NASA's Jet Propulsion Laboratory. We validate that the ZWFS can measure low-and mid-spatial frequency aberrations up to the control limit of the deformable mirror (DM), with surface height sensitivity as small as 1 pm, using a configuration similar to the HabEx and LUVOIR concepts. Furthermore, we demonstrate closed-loop control, resolving an individual DM actuator, with residuals consistent with theoretical models. In addition, we predict the expected performance of a ZWFS on future space telescopes using natural starlight from a variety of spectral types. The most challenging scenarios require ∼1 h of integration time to achieve picometer sensitivity. This timescale may be drastically reduced by using internal or external laser sources for sensing purposes. The experimental results and theoretical predictions presented here advance the WFS technology in the context of the next generation of space telescopes with coronagraph instruments.

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<title>Advanced phase-contrast techniques for wavefront sensing and adaptive optics</title>

Cited by 8 publications

References 25 publications

Dual purpose lyot coronagraph masks for simultaneous high-contrast imaging and high-resolution wavefront sensing

Dual purpose lyot coronagraph masks for simultaneous high-contrast imaging and high-resolution wavefront sensing

Wavefront sensing based on phase contrast theory and coherent optical processing

Wavefront sensing and control in space-based coronagraph instruments using Zernike’s phase-contrast method

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