Raven: a harbinger of multi-object adaptive optics-based instruments at the Subaru Telescope

Conan, Rodolphe; Bradley, Colin; Lardière, Olivier; Blain, Celia; Venn, Kim A.; Andersen, David R.; Simard, Luc; Véran, Jean-Pierre; Herriot, Glen; Loop, David; Usuda, Tomonori; Oya, Shin; Hayano, Yutaka; Terada, Hiroshi; Akiyama, Masayuki

doi:10.1117/12.856567

Cited by 8 publications

(5 citation statements)

References 18 publications

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“…We introduce OTF DL (ρ/λ) as the diffraction-limit OTF that characterizes the angular frequencies distribution imposed by the pupil shape OTF DL (ρ/λ) = 1/S P P(r)P(r + ρ)dr (7) that allows to write equation 6 as…”

Section: Spatial Psf Extrapolation 21 Anisoplanatism Transfer Functionmentioning

confidence: 99%

“…Yet, such an analysis is compromised if relies on on-sky observations, in a way the real C 2 n (h) is not be perfectly known; downstream results would be contaminated by anisoplanatism model errors, such as the discrete number of layers or the exact LGS height that is not perfectly identified for instance. As an alternative we have applied this approach on the HeNOS Multi-conjugated AO (MCAO) testbed designed to be the demonstrator for NFIRAOS [7]. We lay in this paper all the theoretical background our near-future work will be based on, that will be particularly focused on PSF characterisation application to crowded fields observation, such as the Galactic center.…”

Section: Introductionmentioning

confidence: 99%

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Off-axis point spread function characterization in laser guide star adaptive optics systems

Beltramo-Martin

Correia

Mieda³

et al. 2018

Monthly Notices of the Royal Astronomical Society

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Adaptive optics (AO) restore the angular resolution of ground-based telescopes, but at the cost of delivering a time-and space-varying point spread function (PSF) with a complex shape. PSF knowledge is crucial for breaking existing limits on the measured accuracy of photometry and astrometry in science observations. In this paper, we concentrate our analyses on anisoplanatism signature only onto PSF: for large-field observations (20") with singleconjugated AO, PSFs are strongly elongated due to anisoplanatism that manifests itself as three different terms for Laser-guide star (LGS) systems: angular, focal and tilt. We propose a generalized model that relies on a point-wise decomposition of the phase and encompasses the non-stationarity of LGS systems. We demonstrate it is more accurate and less computationally demanding than existing models: it agrees with end-to-end physical-optics simulations to within 0.1% of PSF measurables, such as Strehl-ratio, FWHM and fraction of variance unexplained. Secondly, we study off-axis PSF modelling is with respect to C 2 n (h) profile (heights and fractional weights). For 10 m class telescope, PSF morphology is estimated at 1%-level as long as we model the atmosphere with at least 7 layers whose heights and weights are known respectively with 200m and 10%-precision. As a verification test we used the Canada's NRC-Herzberg HeNOS testbed data, featuring four lasers. We highlight capability of retrieving off-axis PSF characteristics within 10% of fraction of variance unexplained, which complies with the expected range from the sensitivity analysis. Our new off-axis PSF modelling method lays the ground-work for testing on-sky in the near future. *

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Section: Spatial Psf Extrapolation 21 Anisoplanatism Transfer Functionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Off-axis point spread function characterization in laser guide star adaptive optics systems

Beltramo-Martin

Correia

Mieda³

et al. 2018

Monthly Notices of the Royal Astronomical Society

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“…Since MOAO is an open-loop control system, the system includes four WFSs, three of which are used for atmospheric turbulence tomography and the fourth is used to detect the corrected wavefront. In addition, Subaru Telescope is also carrying out MOAO technology research [137] and developed the demonstration system Raven [138,139], which has been placed under trial observation. The system can work in three AO modes: traditional AO, GLAO and MOAO [5].…”

Section: Wide Field Ao Technologymentioning

confidence: 99%

Astronomical adaptive optics: a review

Rao,

Zhong,

Guo

et al. 2024

PhotoniX

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Since the concept of adaptive optics(AO) was proposed in 1953, AO has become an indispensable technology for large aperture ground-based optical telescopes aimed at high resolution observations. This paper provides a comprehensive review of AO progress for large aperture astronomical optical telescopes including both night-time and day-time solar optical telescopes. The recent AO technological advances, such as Laser Guide Star, Deformable Secondary Mirror, Extreme AO, and Multi-Conjugate AO are focused.

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“…Wide-field facility-class AO systems that make use of tomographic information, such as GEMS [3] are now starting to be used on-sky, with others in development [4], [5] .…”

Section: Introductionmentioning

confidence: 99%

Tests of open-loop LGS tomography with CANARY

et al. 2012

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CANARY is an on-sky demonstrator adaptive optics (AO) system that in 2010 provided the first on-sky demonstration of open-loop tomographic adaptive optics correction using natural guide stars (NGS). Phase B of the CANARY experiment aims to extend the instrument from its original configuration by also measuring wavefronts from four offaxis Rayleigh laser guide stars (LGS). This upgrade allows CANARY to perform tomographic wavefront sensing over a 2.5arcminute field of view using any mix of up to seven off-axis wavefront sensors (four LGS and three NGS) simultaneously. AO correction within CANARY is performed on-axis along a single line of sight using a 52-actuator deformable mirror being controlled in open-loop. Here we give an overview of the Phase B LGS system, discuss the calibration of a mixed NGS/LGS tomographic system and present the recent laboratory and on-sky results from the Phase B commissioning.

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Raven: a harbinger of multi-object adaptive optics-based instruments at the Subaru Telescope

Cited by 8 publications

References 18 publications

Off-axis point spread function characterization in laser guide star adaptive optics systems

Off-axis point spread function characterization in laser guide star adaptive optics systems

Astronomical adaptive optics: a review

Tests of open-loop LGS tomography with CANARY

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