Multiconjugate Adaptive Optics for Astronomy

Rigaut, François; Neichel, Benoît

doi:10.1146/annurev-astro-091916-055320

Cited by 47 publications

(30 citation statements)

References 139 publications

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“…For reflection-based transmission control, aberrations in two different focal planes are independently computed at the same time. This is similar to multiconjugate adaptive optics, where typically however an additional SLM is used to correct for a second focal plane [43][44][45]. Additionally, while we generated single focal spots, arbitrary other focal distributions could be generated as well (for example for applications in optogenetics).…”

Section: Discussionmentioning

confidence: 99%

Differentiable model-based adaptive optics with transmitted and reflected light

Vishniakou¹,

Seelig²

2020

Opt. Express

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Aberrations limit optical systems in many situations, for example when imaging in biological tissue. Machine learning offers novel ways to improve imaging under such conditions by learning inverse models of aberrations. Learning requires datasets that cover a wide range of possible aberrations, which however becomes limiting for more strongly scattering samples, and does not take advantage of prior information about the imaging process. Here, we show that combining model-based adaptive optics with the optimization techniques of machine learning frameworks can find aberration corrections with a small number of measurements. Corrections are determined in a transmission configuration through a single aberrating layer and in a reflection configuration through two different layers at the same time. Additionally, corrections are not limited by a predetermined model of aberrations (such as combinations of Zernike modes). Focusing in transmission can be achieved based only on reflected light, compatible with an epidetection imaging configuration.

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Section: Discussionmentioning

confidence: 99%

Differentiable model-based adaptive optics with transmitted and reflected light

Vishniakou¹,

Seelig²

2020

Opt. Express

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“…MCAO uses multiple wavefront sensors and multiple deformable mirrors to achieve wide-field correction. 55 The region of sky over which turbulence can be considered uniform is described by the isoplanatic angle, for which a typical value may be 30" at an observing wavelength of 2 μm. Anisoplanatism introduces nonuniformity to the point spread function across the corrected field, limits the size of the corrected field, and effectively limits the sky coverage of AO.…”

Section: Multiconjugate Adaptive Opticsmentioning

confidence: 99%

Enabling discoveries: a review of 30 years of advanced technologies and instrumentation at the National Science Foundation

Kurczynski

Milojević

2020

J. Astron. Telesc. Instrum. Syst.

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Over its more than 30-year history, the Advanced Technologies and Instrumentation (ATI) program has provided grants to support technology development and instrumentation for ground-based astronomy. Through a combination of automated literature assessment and indepth literature review, we present a survey of ATI-funded research and its impact on astronomy and society. Award acknowledgment and literature citation statistics for ATI are comparable to a comparison astronomy grant program that does not support technology development. Citation statistics for both NSF-funded programs exceed those of the general astronomical literature. Numerous examples demonstrate the significant, long-term impact of ATI-supported research in astronomy. As part of this impact, ATI grants have provided many early career researchers the opportunity to gain critical professional experience. However, technology development unfolds over a time period that is longer than an individual grant. A longitudinal perspective shows that investments in technology and instrumentation have led to extraordinary scientific progress. © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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“…This allows correction of the atmosphere using one or several DMs, forming a family of tomographic AO techniques (see e.g. Rigaut 2002;Beckers 1988;Vidal et al 2010;Rigaut & Neichel 2018). These tomographic AO systems are fundamental to the operation of the next generation of extremely large telescopes (ELTs) and as such it is important for the science goals of these telescopes that they operate to the fullest extent of their capability: applying the best possible atmospheric correction in the given conditions.…”

Section: Introductionmentioning

confidence: 99%

Limitations imposed by optical turbulence profile structure and evolution on tomographic reconstruction for the ELT

Farley

Osborn

Morris

et al. 2020

Monthly Notices of the Royal Astronomical Society

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The performance of tomographic adaptive optics systems is intrinsically linked to the vertical profile of optical turbulence. Firstly, a sufficient number of discrete turbulent layers must be reconstructed to model the true continuous turbulence profile. Secondly over the course of an observation, the profile as seen by the telescope changes and the tomographic reconstructor must be updated. These changes can be due to the unpredictable evolution of turbulent layers on meteorological timescales as short as minutes.Here we investigate the effect of changing atmospheric conditions on the quality of tomographic reconstruction by coupling fast analytical adaptive optics simulation to a large database of 10 691 high resolution turbulence profiles measured over two years by the Stereo-SCIDAR instrument at ESO Paranal, Chile. This work represents the first investigation of these effects with a large, statistically significant sample of turbulence profiles. The statistical nature of the study allows us to assess not only the degradation and variability in tomographic error with a set of system parameters (e.g. number of layers, temporal update period) but also the required parameters to meet some error threshold. In the most challenging conditions where the profile is rapidly changing, these parameters must be far more tightly constrained in order to meet this threshold. By providing estimates of these constraints for a wide range of system geometries as well as the impact of different temporal optimisation strategies we may assist the designers of tomographic AO for the ELT to dimension their systems.

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Multiconjugate Adaptive Optics for Astronomy

Cited by 47 publications

References 139 publications

Differentiable model-based adaptive optics with transmitted and reflected light

Differentiable model-based adaptive optics with transmitted and reflected light

Enabling discoveries: a review of 30 years of advanced technologies and instrumentation at the National Science Foundation

Limitations imposed by optical turbulence profile structure and evolution on tomographic reconstruction for the ELT

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