Multiple guide stars to improve the performance of laser guide star adaptive optical systems

Rue, Imelda A. De La; Ellerbroek, Brent L.

doi:10.1117/12.321723

Cited by 2 publications

(2 citation statements)

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“…Hybrid AO was first theorized by Ellerbroek in 1994 [47] as one of many ways to extend the useful field of view of laser AO systems. And while hybrid AO enjoyed a successful single test at Starfire Optical Range in the 1990s [48], the US Air Force instead developed multiple Sodium laser AO systems because of their field of view requirements [49].…”

Section: Demonstration Of Hybrid Ao Technology and Techniquesmentioning

confidence: 99%

The Robo-AO-2 facility for rapid visible/near-infrared AO imaging and the demonstration of hybrid techniques

Baranec

Chun

Hall

et al. 2018

Adaptive Optics Systems VI

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We are building a next-generation laser adaptive optics system, Robo-AO-2, for the UH 2.2-m telescope that will deliver robotic, diffraction-limited observations at visible and near-infrared wavelengths in unprecedented numbers. The superior Maunakea observing site, expanded spectral range and rapid response to high-priority events represent a significant advance over the prototype. Robo-AO-2 will include a new reconfigurable natural guide star sensor for exquisite wavefront correction on bright targets and the demonstration of potentially transformative hybrid AO techniques that promise to extend the faintness limit on current and future exoplanet adaptive optics systems. Robo-AO-2As discussed in the Astro-2010 Decadal survey [1], large area surveys will dominate the next decade of astronomy. Transient surveys such as LSST and space-based exoplanet, supernova, and lensing surveys such as TESS and WFIRST will join the Gaia all-sky astrometric survey in producing a flood of potential discoveries. The NRC's "Optimizing the U.S. Ground-Based Optical and Infrared Astronomy System" [2] stresses the need to characterize these discoveries through several recommendations: Rec#4c) rapid observations of faint transients; Rec#6) continued investment in critical instrument technologies such as adaptive optics; Rec#7) use existing instrument and research programs to support training to build instruments. Additionally, the 2008 U. S. Adaptive Optics Roadmap [3], recognizing the llll*baranec@hawaii.edu; 1-808-932-2318; http://high-res.org; http://robo-ao.org limitations of adaptive optics on large apertures, noted among its recommendations that, "Mid-sized telescopes provide compelling opportunities for world-class science in specialized fields not typically accessible on larger telescopes due to limitations imposed by schedule / observing model and in some cases specialized capabilities." Robo-AO-2 will uniquely address these recommendations by combining near-HST resolution across visible and nearinfrared (NIR) wavelengths (λ = 400 -1800 nm), unmatched observing efficiency, and extensive, dedicated time on the UH 2.2-m. We will enable high-acuity, high-sensitivity follow-up observations of several tens of thousands of objects per year. Robo-AO-2 will also respond to target-of-opportunity events within minutes, minimizing the time between discovery and characterization, and will interleave different programs with its intelligent queue. Robo-AO-2 will be permanently mounted on the UH 2.2-m, will be available year round, will add NIR imaging, tip-tilt correction capability to mV~17 and will enable excellent, <110 nm RMS, image quality on bright, mV<9, objects using a stellar wavefront sensor.

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Section: Demonstration Of Hybrid Ao Technology and Techniquesmentioning

confidence: 99%

The Robo-AO-2 facility for rapid visible/near-infrared AO imaging and the demonstration of hybrid techniques

Baranec

Chun

Hall

et al. 2018

Adaptive Optics Systems VI

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show abstract

“…Ellerbroek first theorized the hybrid LGSs AO as a way to reduce the sodium laser power requirement for laser AO system in 1994 (Ellerbroek 1994). A single successful test of hybrid LGSs AO was conducted at the Starfire Optical Range in the 1990s (Ellerbroek & Rhoadarmer 1997), however, the US Air Force alternatively developed the multiple Sodium & Ellerbroek 1998).…”

Section: Introductionmentioning

confidence: 99%

A Hybrid Pulsed Rayleigh-sodium Laser Guide Star Adaptive Optics System for Strong Turbulence Observations

Deng

Wei

Jin

et al. 2019

PASP

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Sodium laser guide star (LGS) adaptive optics (AO) systems have become highly productive tools for all-sky astronomical observations with large telescopes. However, the performance of these systems is limited by the brightness of the sodium LGS and the number of wavefront sensor subapertures used during strong atmospheric turbulence. We propose a hybrid pulsed Rayleigh-sodium LGS AO system that exhibits an improved Strehl ratio of 55% to eliminate the effects of partial wavefront sampling for limited sodium LGS brightness in K-band. This technique uses the Rayleigh scattering signal, a byproduct of pulsed sodium LGS, with temporal-gating approach. This system comprises a Rayleigh LGS to direct light toward the wavefront sensor under a wide variety of atmospheric conditions. The Rayleigh beacon provides high-order corrections to the low-altitude layers. Any remaining distortions from higher layers typically exist on a much larger scale, which can be sampled with comparatively larger subapertures. This approach could improve the performance of large optics-infrared telescopes equipped with hybrid Rayleigh-sodium LGS AO systems during strong turbulence events.

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Multiple guide stars to improve the performance of laser guide star adaptive optical systems

Cited by 2 publications

References 0 publications

The Robo-AO-2 facility for rapid visible/near-infrared AO imaging and the demonstration of hybrid techniques

The Robo-AO-2 facility for rapid visible/near-infrared AO imaging and the demonstration of hybrid techniques

A Hybrid Pulsed Rayleigh-sodium Laser Guide Star Adaptive Optics System for Strong Turbulence Observations

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