Reduction of the diffraction pattern in segmented apertures

Canales, Vidal F.; Oti, José E.; Valle, Pedro J.; Cagigal, Manuel P.; Devaney, M. N.

doi:10.1117/1.2354160

Cited by 3 publications

(2 citation statements)

References 19 publications

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“…In other applications, axial resolution is improved [15,22,23]. There are applications where 3D superresolution is expected [13,14,24], or where the depth of focus must be increased [25], or even a diffraction pattern must be modified [26]. Such a great variety of performances can be obtained with annular binary filters.…”

Section: Introductionmentioning

confidence: 99%

Pupil filter design by using a Bessel functions basis at the image plane

Canales¹,

Cagigal²

2006

Opt. Express

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Many applications can benefit from the use of pupil filters for controlling the light intensity distribution near the focus of an optical system. Most of the design methods for such filters are based on a second-order expansion of the Point Spread Function (PSF). Here, we present a new procedure for designing radially-symmetric pupil filters. It is more precise than previous procedures as it considers the exact expression of the PSF, expanded as a function of first-order Bessel functions. Furthermore, this new method presents other advantages: the height of the side lobes can be easily controlled, it allows the design of amplitude-only, phase-only or hybrid filters, and the coefficients of the PSF expansion can be directly related to filter parameters. Finally, our procedure allows the design of filters with very different behaviours and optimal performance.

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Section: Introductionmentioning

confidence: 99%

Pupil filter design by using a Bessel functions basis at the image plane

Canales¹,

Cagigal²

2006

Opt. Express

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“…The smaller segmented mirror could then be combined to form the large mirror. Many work have been done concerning large mirror segmentation and hexagons configurations [2][3][4][5][6][7][8]. The objective of this paper is to examine the effect of varying the number of hexagons that to be fill the telescope aperture on the quality of optical telescope.…”

Section: Introductionmentioning

confidence: 99%

Imaging with Hexagonal Segmented Mirror

Hassan¹,

Mohammed²,

Tawfiq³

2012

ETJ

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Different hexagons configuration aperture models of the optical telescope mirror is carefully considered in this study. The point spread function and the modulation transfer function of a reference star using different hexagons configuration are computed and the quantitative assessment for the results are described. It has been shown that the height of the point spread function decreases rapidly when the area of the circular aperture of the optical telescope is 18 times the area of the individual hexagon to be arrange to fill this aperture. No significant change has been noticed as the area of the this aperture exceeds 121 times the area of the individual hexagon.

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Amplitude image processing by diffractive optics

2016

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In contrast to the standard digital image processing, which operates over the detected image intensity, we propose to perform amplitude image processing. Amplitude processing, like low pass or high pass filtering, is carried out using diffractive optics elements (DOE) since it allows to operate over the field complex amplitude before it has been detected. We show the procedure for designing the DOE that corresponds to each operation. Furthermore, we accomplish an analysis of amplitude image processing performances. In particular, a DOE Laplacian filter is applied to simulated astronomical images for detecting two stars one Airy ring apart. We also check by numerical simulations that the use of a Laplacian amplitude filter produces less noisy images than the standard digital image processing.

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Reduction of the diffraction pattern in segmented apertures

Cited by 3 publications

References 19 publications

Pupil filter design by using a Bessel functions basis at the image plane

Pupil filter design by using a Bessel functions basis at the image plane

Imaging with Hexagonal Segmented Mirror

Amplitude image processing by diffractive optics

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