One‐sided Achromatic Phase Apodization for Imaging of Extrasolar Planets

Yang, Weidong; Kostinski, A. B.

doi:10.1086/382586

Cited by 54 publications

(22 citation statements)

References 30 publications

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“…High-contrast imaging with phase apodization was proposed by Yang & Kostinski (2004), who found solutions for broadband imaging and obtained contrast/throughput performances similar to amplitude apodization designs (although only over a quarter of the field of view). Codona & Angel (2004) independently computed a PPA solution for the Hubble Space Telescope pupil to suppress diffraction in half of the field of view.…”

Section: Pupil Phase Apodization (Ppa)mentioning

confidence: 99%

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Theoretical Limits on Extrasolar Terrestrial Planet Detection with Coronagraphs

Guyon¹,

Pluzhnik²,

Kuchner³

et al. 2006

ASTROPHYS J SUPPL S

304

269

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Many high-contrast coronagraph designs have recently been proposed. In this paper, their suitability for direct imaging of extrasolar terrestrial planets is reviewed. We also develop a linear algebra based model of coronagraphy that can both explain the behavior of existing coronagraphs and quantify the coronagraphic performance limit imposed by fundamental physics. We find that the maximum theoretical throughput of a coronagraph is equal to 1 minus the nonaberrated noncoronagraphic PSF of the telescope. We describe how a coronagraph reaching this fundamental limit may be designed, and how much improvement over the best existing coronagraph design is still possible. Both the analytical model and numerical simulations of existing designs also show that this theoretical limit rapidly degrades as the source size is increased: the ''highest performance'' coronagraphs, those with the highest throughput and smallest inner working angle (IWA), are the most sensitive to stellar angular diameter. This unfortunately rules out the possibility of using a small IWA (

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Section: Pupil Phase Apodization (Ppa)mentioning

confidence: 99%

“…The PPA design adopted in this work uses a square pupil mask and the sum of two identical phase apodizations (eq. [6] in Yang & Kostinski 2004), one in the x-direction, the other in the y-direction.…”

Section: Pupil Phase Apodization (Ppa)mentioning

confidence: 99%

Theoretical Limits on Extrasolar Terrestrial Planet Detection with Coronagraphs

Guyon¹,

Pluzhnik²,

Kuchner³

et al. 2006

ASTROPHYS J SUPPL S

304

269

View full text Add to dashboard Cite

show abstract

“…Note that such a dark hole generation experiment requires no additional hardware, as it relies simply on adding a phase aberration term to the DM. The use of a more general pupil plane phase distribution to generate even darker regions in the focal plane has been discussed by Yang & Kostinski (2004) and Codona et al (2006).…”

Section: Introductionmentioning

confidence: 99%

Extreme Adaptive Optics Imaging with a Clear and Well‐Corrected Off‐Axis Telescope Subaperture

Serabyn¹,

Wallace²,

Troy³

et al. 2007

ApJ

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Rather than using an adaptive optics (AO) system to correct a telescope's entire pupil, it can instead be used to more finely correct a smaller subaperture. Indeed, existing AO systems can be used to correct a subaperture 1 3 to 1 2 the size of a 5Y10 m telescope to extreme adaptive optics (ExAO) levels. We discuss the potential performance of a clear off-axis well-corrected subaperture (WCS), and describe our initial imaging results with a 1.5 m diameter WCS on the Palomar Observatory's Hale Telescope. These include measured Strehl ratios of 0.92Y0.94 in the infrared (2.17 m) and %0.12 in the B band, the latter allowing a binary of separation 0.34 00 to be easily resolved in the blue. Such performance levels enable a variety of novel observational modes, such as infrared ExAO, visible-wavelength AO, and high-contrast coronagraphy. One specific application suggested by the high Strehl ratio stability obtained (1%) is the measurement of planetary transits and eclipses. Also described is a simple ''dark hole'' experiment carried out on a binary star, in which a comatic phase term was applied directly to the deformable mirror, in order to shift the diffraction rings to one side of the point-spread function.

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“…ANK Reddy et al extensively studied two-point resolution of asymmetrically apodized optical systems with amplitude type super solvers [7]. Yang and Kostinski applied asymmetric apodization for imaging of extra solar planets [8]. A. J. Dekker proposed new criterion for optical two-point resolution of optical imaging system under any degree of illumination.…”

Section: Introductionmentioning

confidence: 99%

Resolution of Two Unequally Bright Points of Apodized Optical Systems with Asymmetric Circular Antenna Arrays

Reddy¹,

Shailaja²,

Sagar³

2016

OPJ

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Sparrow criterion of resolution is used for assessment of the resolution of two object points of apodized optical systems under incoherent illumination of light. Semicircular arrays of circular aperture with discrete asymmetric apodization have suppressed side-lobes and a narrower central peak in the image plane termed as PSF good side on alternatively the right and left of the strong spectral point facilitates to detect the presence of weak spectral point in the vicinity of bright spectral point. The results of investigations on optimum discrete pupil function with semicircular arrays on the intensity distributions in the composite image of two object points with widely varying in their intensities under various degree of coherence of illumination have been studied. Sparrow resolution limits and the dip in central intensity as function of degree of coherence of the illumination (γ), intensity ratio (α), degree of asymmetric apodization (b) and number of discrete elements in semicircular array (n). The efficiency of aperture functions is discussed in terms of these parameters. Pupil function capabilities in redistribution of energy in composite image of two object points in close vicinity have been verified for different considerations. Current study has found an improvement in two-point resolution characteristics compared to their unapodized counter part. Fourier analytical properties of an optical system are presented for evaluation of this practical problem.

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One‐sided Achromatic Phase Apodization for Imaging of Extrasolar Planets

Cited by 54 publications

References 30 publications

Theoretical Limits on Extrasolar Terrestrial Planet Detection with Coronagraphs

Theoretical Limits on Extrasolar Terrestrial Planet Detection with Coronagraphs

Extreme Adaptive Optics Imaging with a Clear and Well‐Corrected Off‐Axis Telescope Subaperture

Resolution of Two Unequally Bright Points of Apodized Optical Systems with Asymmetric Circular Antenna Arrays

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