On representing and correcting wavefront errors in high-contrast imaging systems

Give’on, Amir; Kasdin, N. Jeremy; Vanderbei, Robert J.; Avitzour, Yoav

doi:10.1364/josaa.23.001063

Cited by 50 publications

(35 citation statements)

References 9 publications

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“…First, we need to understand precisely how the optimum in Fresnel number is impacted by parameters such as size of the DH, number of actuators, type of aperture, and spectral bandwidth. Second, we need to prove that this technique can be used with fixed mirror apodizing techniques (PIAA, PAVC, Guyon et al 2014;Fogarty et al 2017b) (Shaklan & Green 2006;Give'On et al 2006;Pueyo & Kasdin 2007). However, they were usually used to determine surface quality limits of the optics and/or applied to DM optical design in the proposed Michelson interferometer configuration.…”

Section: Resultsmentioning

confidence: 99%

Active Correction of Aperture Discontinuities-Optimized Stroke Minimization. II. Optimization for Future Missions

Mazoyer

Pueyo

N’Diaye

et al. 2017

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High-contrast imaging and spectroscopy provide unique constraints for exoplanet formation models as well as for planetary atmosphere models. Instrumentation techniques in this field have greatly improved over the last two decades, with the development of stellar coronagraphy, in parallel with specific methods of wavefront sensing and control. Next generation space-and ground-based telescopes will allow the characterization cold solar-system like planets for the first time and maybe even in situ detection of bio-markers. However, the growth of primary mirror diameters, necessary for these detection, comes with an increase of their complexity (segmentation, secondary mirror features). These discontinuities in the aperture can greatly limit the performance of coronagraphic instruments. In this context, we introduced a new technique, Active Correction of Aperture Discontinuities -Optimized Stroke Minimization (ACAD-OSM), to correct for the diffractive effects of aperture discontinuities in the final image plane of a coronagraph, using deformable mirrors. In this paper, we present several tools that can be used to optimize the performance of this technique for its application to future large missions. In particular, we analyze the influence of the deformable setup (size and separating distance) and found that there is an optimal point for this setup, optimizing the performance of the instrument in contrast and throughput while minimizing the strokes applied to the deformable mirrors. These results will help us design future coronagraphic instruments to obtain the best performance.

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Section: Resultsmentioning

confidence: 99%

Active Correction of Aperture Discontinuities-Optimized Stroke Minimization. II. Optimization for Future Missions

Mazoyer

Pueyo

N’Diaye

et al. 2017

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“…This was used by Give'on et al [36,37] and new applications may be found in adaptive optics for anti-aliasing spatial filters [40], pyramid wavefront sensing [41], etc.…”

Section: Resultsmentioning

confidence: 99%

“…This happens when the calculated area is limited and/or when a fine sampling is needed. The MFT was first used by Give'on et al [36,37] for the study of wavefront sensing and correction in high-contrast imaging with shaped pupils [38]. We illustrate the case of a point spread function (PSF) calculation with a field of view ( FOV) of 50 resolution elements in Fig.7.…”

Section: The Case Of Direct Imagingmentioning

confidence: 99%

Fast computation of Lyot-style coronagraph propagation

et al. 2007

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Abstract:We present a new method for numerical propagation through Lyot-style coronagraphs using finite occulting masks. Standard methods for coronagraphic simulations involve Fast Fourier Transforms (FFT) of very large arrays, and computing power is an issue for the design and tolerancing of coronagraphs on segmented Extremely Large Telescopes (ELT) in order to handle both the speed and memory requirements. Our method combines a semi-analytical approach with non-FFT based Fourier transform algorithms. It enables both fast and memory-efficient computations without introducing any additional approximations. Typical speed improvements based on computation costs are of about ten to fifty for propagations from pupil to Lyot plane, with thirty to sixty times less memory needed. Our method makes it possible to perform numerical coronagraphic studies even in the case of ELTs using a contemporary commercial laptop computer, or any standard commercial workstation computer.

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“…The numerical simulations also suggest that extremely small phase aberration less than λ/10,000 rms will be required to achieve the contrast of 10 −10 for detecting extrasolar Earthlike planets. Thus, adaptive optics systems dedicated for highcontrast imagers will play an important role in the terrestrial planet finding missions (Bordé & Traub 2006;Give'on et al 2006;Nishikawa et al 2008). We note that differential imaging techniques can also be used for suppressing the speckle noise (Racine et al 1999;Baba & Murakami 2003;Marois et al 2006;Murakami et al 2006Murakami et al , 2007Zubko et al 2007).…”

Section: Discussionmentioning

confidence: 99%

Achromatic Eight-Octant Phase-Mask Coronagraph Using Photonic Crystal

Murakami¹,

Nishikawa²,

Yokochi³

et al. 2010

ApJ

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We designed and manufactured a photonic-crystal mask which can be used for an achromatic eight-octant phasemask (EOPM) coronagraph for direct detection of extrasolar planets. Laboratory experiments of the EOPM coronagraph were carried out using two laser light sources as a simulated star (wavelengths of 532 and 633 nm). As a result, we attained high extinction of the simulated starlight in both the wavelengths. Halo intensity levels of about 10 −6 and 10 −7 were achieved at an angular distance of 3 and 13λ/D, respectively. We also discuss several issues, such as an effect of phase aberration on the coronagraphic performance, a transmittance of the proposed EOPM, and a novel two-channel coronagraphic configuration to improve system throughput.

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On representing and correcting wavefront errors in high-contrast imaging systems

Cited by 50 publications

References 9 publications

Active Correction of Aperture Discontinuities-Optimized Stroke Minimization. II. Optimization for Future Missions

Active Correction of Aperture Discontinuities-Optimized Stroke Minimization. II. Optimization for Future Missions

Fast computation of Lyot-style coronagraph propagation

Achromatic Eight-Octant Phase-Mask Coronagraph Using Photonic Crystal

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