Multi-laser-guided adaptive optics for the Large Binocular Telescope

Lloyd‐Hart, Michael; Angel, Roger; Green, R.; Stalcup, Thomas; Milton, N. Mark; Powell, Keith

doi:10.1117/12.734821

Cited by 2 publications

(3 citation statements)

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“…As we look forward to truly ubiquitous AO system usage, we wish to consider the case of highest sky coverage fraction, where overall performance is typically dominated by residual tip/tilt errors. Fixed LGS asterisms have been proposed for large telescope LTAO and MCAO systems [20], [21], [22] . Because good wavefront correction is needed in both the science target direction and in the directions of each of the field NGS used for low-order wavefront sensing, the radii of these LGS asterisms have typically been selected to provide a reasonable compromise between the tomography error on-axis and that across the NGS field of regard.…”

Section: Tomography Error From Fixed Vs Patrolling Lgsmentioning

confidence: 99%

Sharpening of natural guide stars for low-order wavefront sensing using patrolling laser guide stars

2008

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A laser guide star (LGS) adaptive optics (AO) system generally requires additional tip/tilt information derived using a natural guide star (NGS), while multi-LGS systems will benefit from measurement of additional low-order wavefront modes using one or more NGS's. If we use AO sharpened NGS's, we can improve both the measurement accuracy and accessible sky fraction while also minimizing the observational overhead of faint NGS acquisition. Multi-object adaptive optics (MOAO) sharpening of NGS is possible where a good estimate of the NGS wavefront can be made, for example where tomographic wavefront information is available. We describe a new approach for high Strehl ratio sharpening, based on additional patrolling laser beacons, to eliminate generalized anisoplanatism and minimize tomography error in the NGS direction.

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Section: Tomography Error From Fixed Vs Patrolling Lgsmentioning

confidence: 99%

Sharpening of natural guide stars for low-order wavefront sensing using patrolling laser guide stars

2008

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“…With a closed-loop system sending AO corrected light to science cameras, the imaging improvement can be directly measured and the parameters which affect correction can be explored. This will lead to a greater understanding of the important factors in upgrading the MMT's laser AO system and for supporting the design of adaptive optics systems for the 2 × 8.4 m Large Binocular Telescope 19 …”

Section: Introductionmentioning

confidence: 99%

“…Unfortunately, due to the limited number of suitably bright natural guide star constellations on the sky, the system will not be able to support routine science observations. However, plans are currently underway to implement GLAO at several telescopes around the world with a variety of techniques [14][15][16][17][18][19] .…”

Section: Introductionmentioning

confidence: 99%

Astronomical imaging using ground-layer adaptive optics

et al. 2007

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Over the past several years, experiments in adaptive optics involving multiple natural and Rayleigh laser guide stars have been carried out by our group at the 1.5 m Kuiper telescope and the 6.5 m MMT telescope. From open-loop data we have calculated the performance gains anticipated from ground-layer adaptive optics (GLAO) and laser tomography adaptive optics corrections. In July 2007, the GLAO control loop was closed around the focus signal from all five laser guide stars at the MMT, leading to a reduction in the measured focus mode on the laser wavefront sensor by 60%. For the first time, we expect to close the full high order GLAO control loop around the five laser beacons and a tilt star at the MMT in October 2007, where we predict image quality of < 0.2 arc seconds FWHM in K band (λ = 2.2 µm) over a 2 arc minute field. We intend to explore the image quality, stability and sensitivity of GLAO correction as a function of waveband with the science instrument PISCES. PISCES is a 1-2.5 µm imager with a field of view of 110 arc seconds, at a scale of 0.11 arc seconds per pixel. This is well matched to the expected FWHM performance of the GLAO corrected field and will be able to examine PSF non-uniformity and temporal stability across a wide field. FGD.

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Multi-laser-guided adaptive optics for the Large Binocular Telescope

Cited by 2 publications

References 14 publications

Sharpening of natural guide stars for low-order wavefront sensing using patrolling laser guide stars

Sharpening of natural guide stars for low-order wavefront sensing using patrolling laser guide stars

Astronomical imaging using ground-layer adaptive optics

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