Active Optics

Wilson, R. N.; Franza, F.; Noethe, L.; Andreoni, G.

doi:10.1080/09500349114550271

Cited by 47 publications

(13 citation statements)

References 7 publications

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“…The instrumental conÐgu-ration consisted of the Tek 1024 ] 1024 CCD, a wide 1A .0 slit, and the grating 11, which is a high-efficiency holographic grating with 3000 "" grooves ÏÏ per millimeter (Wilson et al 1991). The spectral resolution is 0.43 FWHM and A the wavelength coverage is 3870.6È4032.8…”

Section: Observationsmentioning

confidence: 99%

A Black Hole in the Superluminal Source SAX J1819.3−2525 (V4641 Sgr)

Orosz

Kuulkers

Klis

et al. 2001

ApJ

231

269

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Section: Observationsmentioning

confidence: 99%

A Black Hole in the Superluminal Source SAX J1819.3−2525 (V4641 Sgr)

Orosz

Kuulkers

Klis

et al. 2001

ApJ

231

269

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“…Large optical telescopes are very expensive for two principal reasons: that the surfaces of their mirrors must be polished to high optical quality (< λ/10) and they must be held in very rigid, and/or adaptive, support systems (Wilson et al 1991;Salas et al -11 -1997) so that they do not deform as the telescope moves around the sky. In principle there is an alternative far less expensive solution to the problem: One could correct the aberrations caused by lower-quality optics and an inferior support system using adaptive optics.…”

Section: Correction Of the Aberrations Of Large Mirrorsmentioning

confidence: 99%

“…Here, we suggest that they could be used as active optical correction devices, reducing the error budget requirements of the primary mirror of a telescope and its active support structure. Active correction of the optical aberrations induced by the primary mirror and support structure already exists on modern telescopes (Wilson et al 1991;Salas et al 1997), but the correction is done by an active support, not using a deformable mirror. One could also correct aberrations introduced by the telescope auxiliary optics.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Liquid Deformable Mirrors for Astronomical Applications: Active Correction of Optical Aberrations From Lower-Grade Optics and Support System

Borra

2012

ApJS

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Deformable mirrors are increasingly used in astronomy. However, they still are limited in stroke for active correction of high amplitude optical aberrations.Magnetic Liquid deformable mirrors (MLDMs) are a new technology that has advantages of high-amplitude deformations and low costs. In this paper we demonstrate extremely high strokes and inter-actuator strokes achievable by MLDMs which can be used in astronomical instrumentation. In particular, we consider the use of such a mirror to suggest an interesting application for the next generation of large telescopes. We present a prototype 91-actuator deformable mirror made of a magnetic liquid (ferrofluid). This mirror uses a technique that linearizes the response of such mirrors by superimposing a large and uniform magnetic field to the magnetic field produced by an array of small coils. We discuss experimental results that illustrate the performance of MLDMs. A most interesting application of MLDMs comes from the fact they could be used to correct the aberrations of large and lower optical quality primary mirrors held by simple support systems. We estimate basic parameters of the needed MLDMs, obtaining reasonable values.

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“…Second, one can use the telescope's entire field of view because all wavefront errors are constant over the field, except for the ones generated by the atmosphere, which have been averaged out. At present, there are only two functioning active telescopes: the European Southem Observatory (ESO) 3.5-m New Technology Telescope (NTT) at La Silla in the Chilean Andes, which went into operation in 1989 (18), and the 10-m Keck telescope, which went into operation when its primary mirror was completed in 1992 (19), on Mauna Kea, Hawaii. The NTT has 75 active supports under its monolithic primary mirror, and the axial and lateral position of the secondary mirror is controlled.…”

Section: Active Opticsmentioning

confidence: 99%

Active Optics, Adaptive Optics, and Laser Guide Stars

Hubin

Noethe

1993

Science

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Optical astronomy is crucial to our understanding of the universe, but the capabilities of ground-based telescopes are severely limited by the effects of telescope errors and of the atmosphere on the passage of light. Recently, it has become possible to construct inbuilt corrective devices that can compensate for both types of degradations as observations are conducted. For full use of the newly emerged class of 8-meter telescopes, such active corrective capabilities, known as active and adaptive optics, are essential. Some physical limitations in the adaptive optics field can be overcome by artificially created reference stars, called laser guide stars. These new technologies have lately been applied with success to some medium and very large telescopes.

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Active Optics

Cited by 47 publications

References 7 publications

A Black Hole in the Superluminal Source SAX J1819.3−2525 (V4641 Sgr)

A Black Hole in the Superluminal Source SAX J1819.3−2525 (V4641 Sgr)

Magnetic Liquid Deformable Mirrors for Astronomical Applications: Active Correction of Optical Aberrations From Lower-Grade Optics and Support System

Active Optics, Adaptive Optics, and Laser Guide Stars

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