Pupil plane wavefront sensing with an oscillating prism

Ragazzoni, Roberto

doi:10.1080/095003496156165

Cited by 180 publications

(225 citation statements)

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“…Figure 5 shows different possible arrangements of the reference facet on the primary mirror, for both segmented and diluted-aperture geometry. The reader will easily verify that the whole set of equations (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14) leading to the final phase retrieval formulae remains valid when the reference pupil is decentred of a given amount with respect to the main pupil: in that case Eq. [16] will simply generate a laterally-shifted pupil map without any information loss.…”

Section: Alternative Designsmentioning

confidence: 99%

“…Unfortunately, the most familiar and efficient Wavefront Sensors (WFS) employed in Adaptive Optics are not well matched to that purpose, because they are all based upon WFE slopes or curvature measurements (then reconstructing the wavefronts digitally). Typical examples are the Shack-Hartmann [1], the shearing interferometer [2], the curvature sensor [3] and the most recently proposed pyramidal WFS [4]. Piston evaluation is hardly achievable from these devices, therefore direct phase measurement techniques should be preferred.…”

Section: Introductionmentioning

confidence: 99%

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Conceptual design of a phase-shifting telescope-interferometer

Hénault

2006

Optics Communications

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This paper deals with the theoretical principle and optical design of a phase-shifting telescopeinterferometer. What is called a "Telescope-Interferometer" (T-I) is indeed a novel, recently proposed Wavefront Error (WFE) sensing technique, whose basic idea consists in combining the main pupil of a telescope with a second, off-axis reference arm. Then a weak modulation of the Point Spread Function (PSF) is generated at the focal plane, allowing for direct phase measurements. We propose a notable improvement of the method, inspired from classical principles of phase shifting interferometry. Herein are presented the alternative principle and its achievable measurement accuracy. The technique shows high performance excepted on narrow areas located near the pupil boundary. It is applicable to both ground or space telescopes and is suitable for the co-phasing of segmented mirrors, which is of prime importance in view of future giant telescope projects. PACS: 42.30.Kq; 42.30.Rx; 95.55.Cs; 95.55.Fw; 95.75.Qr

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Section: Alternative Designsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Conceptual design of a phase-shifting telescope-interferometer

Hénault

2006

Optics Communications

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“…This is not an attractive prospect for an ELT-scale MOAO system, however one possibility may be to have a pre-defined number of high and low order wavefront sensors present, which can then be selected depending on target availability. Alternatively, a Pyramid wavefront sensor (Ragazzoni 1996) can be used, which provides the ability to re-bin wavefront sensor images on-the-fly. Here, we do not consider the use of Pyramid sensors as the relative merits of Shack-Hartmann and Pyramid systems have been explored elsewhere, and are not part of the baseline design for the current E-ELT MOAO instrument concept.…”

Section: Exploration Of Lgs Numbermentioning

confidence: 99%

Monte Carlo modelling of multi-object adaptive optics performance on the European Extremely Large Telescope

Basden¹,

Morris²

2016

Mon. Not. R. Astron. Soc.

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The performance of a wide-field adaptive optics system depends on input design parameters. Here we investigate the performance of a multi-conjugate adaptive optics system design for the European Extremely Large Telescope, using an end-to-end Monte-Carlo adaptive optics simulation tool, DASP. We consider parameters such as the number of laser guide stars, sodium layer depth, wavefront sensor pixel scale, number of deformable mirrors, mirror conjugation and actuator pitch. We provide potential areas where costs savings can be made, and investigate trade-offs between performance and cost. We conclude that a 6 laser guide star system using 3 DMs seems to be a sweet spot for performance and cost compromise.

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“…It is a well-proven and mature technology, implemented both by Gemini/GPI and VLT/SPHERE. The pyramid wavefront sensor (PWFS) is a more recent development proposed in 1995 [24]. A pyramidal prism is inserted in a focal plane.…”

Section: Wavefront Sensingmentioning

confidence: 99%

Adaptive Optics in High-Contrast Imaging

Milli¹,

Mawet²,

Mouillet³

et al. 2016

Astronomy at High Angular Resolution

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The development of adaptive optics (AO) played a major role in modern astronomy over the last three decades. By compensating for the atmospheric turbulence, these systems enable to reach the diffraction limit on large telescopes. In this review, we will focus on high contrast applications of adaptive optics, namely, imaging the close vicinity of bright stellar objects and revealing regions otherwise hidden within the turbulent halo of the atmosphere to look for objects with a contrast ratio lower than 10 −4 with respect to the central star. Such high-contrast AO-corrected observations have led to fundamental results in our current understanding of planetary formation and evolution as well as stellar evolution. AO systems equipped three generations of instruments, from the first pioneering experiments in the nineties, to the first wave of instruments on 8m-class telescopes in the years 2000, and finally to the extreme AO systems that have recently started operations. Along with highcontrast techniques, AO enables to reveal the circumstellar environment: massive protoplanetary disks featuring spiral arms, gaps or other asymetries hinting at ongoing planet formation, young giant planets shining in thermal emission, or tenuous debris disks and micron-sized dust leftover from collisions in massive asteroid-belt analogs. After introducing the science case and technical requirements, we will review the architecture of standard and extreme AO systems, before presenting a few selected science highlights obtained with recent AO instruments.

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Pupil plane wavefront sensing with an oscillating prism

Cited by 180 publications

References 0 publications

Conceptual design of a phase-shifting telescope-interferometer

Conceptual design of a phase-shifting telescope-interferometer

Monte Carlo modelling of multi-object adaptive optics performance on the European Extremely Large Telescope

Adaptive Optics in High-Contrast Imaging

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