One-dimensional spectra of turbulence-induced Zernike aberrations: time-delay and isoplanicity error in partial adaptive compensation

Roddier, F.; Northcott, M. J.; Graves, J. E.; McKenna, Dan; Roddier, D.

doi:10.1364/josaa.10.000957

Cited by 96 publications

(55 citation statements)

References 10 publications

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“…The light from the science target, which is generally different from the GS, crosses a different path, especially as far as high altitude layers are concerned, and experiences different aberrations. This effect is commonly referred to as angular anisoplanatism (Roddier et al 1993;Wilson & Jenkins 1996). In order to achieve an acceptable correction on the science object it is therefore necessary to select a sufficiently close GS.…”

Section: Introductionmentioning

confidence: 99%

Closed loop performance of a layer-oriented multi-conjugate adaptive optics system

Diolaiti

Ragazzoni

Tordi

2001

A&A

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Abstract. The dynamic properties of a layer-oriented multi-conjugate adaptive optics system are examined. It is shown that such a system is stable and closes the loop. A simplified analysis of the achievable correction is presented, in order to define the conditions in which the layer-oriented approach is equivalent to other linear reconstruction schemes. It is found that this approach is equivalent to an optimum one, under certain assumptions, but still retaining the potential advantages of such a novel scheme.

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Section: Introductionmentioning

confidence: 99%

Closed loop performance of a layer-oriented multi-conjugate adaptive optics system

Diolaiti

Ragazzoni

Tordi

2001

A&A

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“…A Fourier domain approach is used, and the phase errors on each optical surface are modeled as "phase screens" with shift-invariant statistics at one or several conjugate ranges from the optical system pupil. The image distortion errors inherit this property of stationarity, and some steps of the work consequently resemble previous analysis of tilt anisoplanatism in adaptive optical (AO) systems (Roddier et al 1993). …”

Section: Introductionmentioning

confidence: 60%

A Fourier domain model for estimating astrometry errors due to static and quasi-static optical surface errors

Ellerbroek

2013

A&A

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Context. The wavefront aberrations due to optical surface errors in adaptive optics systems and science instruments can be a significant error source for high precision astrometry. Aims. This report derives formulas for evaluating these errors which may be useful in developing astrometry error budgets and optical surface quality specifications. Methods. A Fourier domain approach is used, and the errors on each optical surface are modeled as "phase screens" with stationary statistics at one or several conjugate ranges from the optical system pupil. Three classes of error are considered: (i) errors in initially calibrating the effects of static surface errors; (ii) the effects of beam translation, or "wander," across optical surfaces due to (for example) instrument boresighting error; and (iii) quasistatic surface errors which change from one observation to the next. Results. For each of these effects, we develop formulas describing the position estimation errors in a single observation of a science field, as well as the differential error between two separate observations. Sample numerical results are presented for the three classes of error, including some sample computations for the Thirty Meter Telescope and the NFIRAOS first-light adaptive optics system.

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“…It has been demonstrated that WFS measurements are predictable [13][14][15][16] and many open-loop demonstrations of the efficiency of such predictive methods have been given. 14,17 In the following we make use of three different approaches to try to forecast the time series of each Zernike coefficient.…”

Section: Wavefront Forecastingmentioning

confidence: 99%

Multiple field-of-view MCAO for a Large Solar Telescope: LOST simulations

et al. 2010

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In the framework of a 4m class Solar Telescope we studied the performance of the MCAO using the LOST simulation package. In particular, in this work we focus on two different methods to reduce the time delay error which is particularly critical in solar adaptive optics: a) the optimization of the wavefront reconstruction by reordering the modal base on the basis of the Mutual Information and b) the possibility of forecasting the wavefront correction through different approaches. We evaluate these techniques underlining pros and cons of their usage in different control conditions by analyzing the results of the simulations and make some preliminary tests on real data.

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One-dimensional spectra of turbulence-induced Zernike aberrations: time-delay and isoplanicity error in partial adaptive compensation

Cited by 96 publications

References 10 publications

Closed loop performance of a layer-oriented multi-conjugate adaptive optics system

Closed loop performance of a layer-oriented multi-conjugate adaptive optics system

A Fourier domain model for estimating astrometry errors due to static and quasi-static optical surface errors

Multiple field-of-view MCAO for a Large Solar Telescope: LOST simulations

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