The adaptive secondary mirror for the Large Binocular Telescope: optical acceptance test and preliminary on-sky commissioning results

Riccardi, Armando; Xompero, Marco; Briguglio, Runa; Quirós-Pacheco, Fernando; Busoni, Lorenzo; Fini, Luca; Puglisi, Alfio; Esposito, Simone; Arcidiacono, Carmelo; Pinna, Enrico; Ranfagni, Piero; Salinari, Piero; Brusa, Guido; Demers, Richard; Biasi, Roberto; Gallieni, Daniele

doi:10.1117/12.858229

Cited by 53 publications

(30 citation statements)

References 7 publications

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“…In particular, MagAO's successful Electro Mechanical acceptance tests in June 2010 proved that the MagAO 585 ASM has larger stroke (±15 µm), a thinner shell (at 1.6 mm vs. 2.0 mm), half the "go to" time (<0.7-1.0ms; with electronic damping), 2-5 nm rms of positional accuracy (by use of a 70 kHz capacitive closedloop), and just 30 nm rms of residual optical static polishing errors (compared to ~100 nm rms on the current MMT shell). These improvements are taken advantage of by LBTAO as well (Riccardi et al 2010), but MagAO's mirror overall is slightly better behaved compared to LBT (MagAO's lack of 87 slower "outer ring" LBT actuators increases its speed w.r.t LBT). Moreover, MagAO's ASM is much more flexible than any other ASM, while also not having the inner "stressed" hole illuminated (due to the 0.29 central obscuration of Magellan).…”

Section: The 2 Nd Generation 585 Element Asm For Magaomentioning

confidence: 99%

A review of astronomical science with visible light adaptive optics

2016

Adaptive Optics Systems V

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We review astronomical results in the visible (λ<1μm) with adaptive optics. Other than a brief period in the early 1990s, there has been little (<1 paper/yr) night-time astronomical science published with AO in the visible from 2000-2013 (outside of the solar or Space Surveillance Astronomy communities where visible AO is the norm, but not the topic of this invited review). However, since mid-2013 there has been a rapid increase visible AO with over 50 refereed science papers published in just ~2.5 years (visible AO is experiencing a rapid growth rate very similar to that of NIR AO science from 1997Close 2000). Currently the most productive small (D < 2 m) visible light AO telescope is the UV-LGS Robo-AO system (Baranec, et al. 2016) on the robotic Palomar D=1.5 m telescope (currently relocated to the Kitt Peak 1.8m; Salama et al. 2016). Robo-AO uniquely offers the ability to target >15 objects/hr, which has enabled large (>3000 discrete targets) companion star surveys and has resulted in 23 refereed science publications. The most productive large telescope visible AO system is the D=6.5m Magellan telescope AO system (MagAO). MagAO is an advanced Adaptive Secondary Mirror (ASM) AO system at the Magellan 6.5m in Chile ). This ASM secondary has 585 actuators with < 1 msec response times (0.7 ms typically). MagAO utilizes a 1 kHz pyramid wavefront sensor. The relatively small actuator pitch (~22 cm/subap) allows moderate Strehls to be obtained in the visible (0.63-1.05 microns). Long exposures (60s) achieve <30mas resolutions, 30% Strehls at 0.62 microns (r') with the VisAO camera in 0.5" seeing with bright R ≤ 9 mag stars. These capabilities have led to over 22 MagAO refereed science publications in the visible. The largest (D=8m) telescope to achieve regular visible AO science is SPHERE/ZIMPOL. ZIMPOL is a polarimeter fed by the ~1.2 kHz SPHERE ExAO system (Fusco et al. 2016). ZIMPOL's ability to differentiate scattered polarized light from starlight allows the sensitive detection of circumstellar disks, stellar surfaces, and envelopes of evolved AGB stars. Here we review the key steps to having good performance in the visible and review the exciting new AO visible science opportunities and science results in the fields of: exoplanet detection; circumstellar and protoplanetary disks; young stars; AGB stars; emission line jets; and stellar surfaces. The recent rapid increase in the scientific publications and power of visible AO is due to the maturity of the next-generation of AO systems and our new ability probe circumstellar regions with very high (10-30 mas) spatial resolutions that would otherwise require much larger (>10m) diameter telescopes in the infrared.

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Section: The 2 Nd Generation 585 Element Asm For Magaomentioning

confidence: 99%

A review of astronomical science with visible light adaptive optics

2016

Adaptive Optics Systems V

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“…The test was devoted to the system optical qualification in a 1g, laboratory conditions environment, before the thermo-vacuum tests. Here, we will briefly recall some general points about the optical calibration of a deformable mirror (DM) for AO: some references (related to the Large Binocular Telescope and Very Large Telescope DMs) may be found in [5] and [6]. As explained in the previous sections, the OBB is controlled by mean of a Feed Forward or stiffness matrix, whose eigenfunctions are the system stiffness modes; such functions provide a natural control basis for the system.…”

Section: B Optical Calibration In 1g Environmentmentioning

confidence: 99%

Development of large aperture telescope technology (LATT): test results on a demonstrator bread-board

Briguglio

Xompero

Riccardi³

et al. 2017

International Conference on Space Optics — ICSO 2014

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“…AS are currently in operations/commissioning at 8m class telescopes (e.g. LBT [1], VLT [2], Magellan [3]) and are included in the optical design of the E-ELT [4] and GMT [5]. From this starting point, we investigated a strategy to design deformable primary mirrors (PM) with the goal to provide space telescopes with active wavefront controlled optic surfaces able to compensate the in-orbit thermoelastic bending and the release of the gravity deformations.…”

Section: The Latt Way: From Adaptive Secondary To Space Active Primentioning

confidence: 99%

Toward large diffraction limited space telescopes with the Latt lightweight active primary

Briguglio

Vecchio

Lisi

et al. 2017

International Conference on Space Optics — ICSO 2016

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The adaptive secondary mirror for the Large Binocular Telescope: optical acceptance test and preliminary on-sky commissioning results

Cited by 53 publications

References 7 publications

A review of astronomical science with visible light adaptive optics

A review of astronomical science with visible light adaptive optics

Development of large aperture telescope technology (LATT): test results on a demonstrator bread-board

Toward large diffraction limited space telescopes with the Latt lightweight active primary

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