Sensing more modes with fewer sub-apertures: the LIFTed Shack–Hartmann wavefront sensor

Meimon, Serge; Fusco, Thierry; Michau, Vincent; Plantet, Cédric

doi:10.1364/ol.39.002835

Cited by 9 publications

(10 citation statements)

References 11 publications

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“…15 Future works include the experimental validation of a variation of LIFT, the LIFTed Shack-Hartmann, for the estimation of high orders. 15,16 …”

Section: Resultsmentioning

confidence: 99%

LIFT: analysis of performance in a laser assisted adaptive optics

Plantet¹,

Meimon²,

Conan³

et al. 2014

SPIE Proceedings

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Laser assisted adaptive optics systems rely on Laser Guide Star (LGS) Wave-Front Sensors (WFS) for high order aberration measurements, and rely on Natural Guide Stars (NGS) WFS to complement the measurements on low orders such as tip-tilt and focus. The sky-coverage of the whole system is therefore related to the limiting magnitude of the NGS WFS.We have recently proposed LIFT, a novel phase retrieval WFS technique, that allows a 1 magnitude gain over the usually used 2×2 Shack-Hartmann WFS. After an in-lab validation, LIFT's concept has been demonstrated on sky in open loop on GeMS (the Gemini Multiconjugate adaptive optics System at Gemini South). To complete its validation, LIFT now needs to be operated in closed loop in a laser assisted adaptive optics system.The present work gives a detailed analysis of LIFT's behavior in presence of high order residuals and how to limit aliasing effects on the tip/tilt/focus estimation. Also, we study the high orders' impact on noise propagation. For this purpose, we simulate a multiconjugate adaptive optics loop representative of a GeMS-like 5 LGS configuration. The residual high orders are derived from a Fourier based simulation. We demonstrate that LIFT keeps a high performance gain over the Shack-Hartmann 2×2 whatever the turbulence conditions. Finally, we show the first simulation of a closed loop with LIFT estimating turbulent tip/tilt and focus residuals that could be induced by sodium layer's altitude variations.

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“…15 Future works include the experimental validation of a variation of LIFT, the LIFTed Shack-Hartmann, for the estimation of high orders. 15,16 …”

Section: Resultsmentioning

confidence: 99%

LIFT: analysis of performance in a laser assisted adaptive optics

Plantet¹,

Meimon²,

Conan³

et al. 2014

SPIE Proceedings

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“…Such an hybrid solution is somehow an analog of a recently proposed method, called LIFTed Shack-Hartmann, that combines phase retrieval and Shack-Hartmann wavefront sensing. [10][11][12] Of course an important question, beyond the scope of the present paper, is to evaluate the expectable wavefront sensing precision for our biological application: a complex question that depends on the technique and on the aberration amplitude as well as structure, on the flux available, but also on the background noise and on the scene structure.…”

Section: Qualitative Comparisonmentioning

confidence: 99%

Adaptive optics for in vivo two-photon calcium imaging of neuronal networks

et al. 2014

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The landscape of biomedical research in neuroscience has changed dramatically in recent years as a result of spectacular progress in dynamic microscopy. However, the optical accessibility of deep brain structures or deeper regions of the surgically exposed hippocampus (a few 100 microns typically) remains limited, due to volumic aberrations created by the sample inhomogeneities. Adaptive optics can correct for these aberrations. Our goal is to realize a novel adaptive optics module dedicated to in vivo two-photon calcium imaging of the hippocampus.The key issue in adaptive optics is the ability to perform an accurate and reliable wavefront sensing. In twophoton microscopy indirect methods are required. Two families of approaches have been proposed so far, the modal sensorless technique and a method based on pupil segmentation. We present here a formal comparison of these approaches, in particular as a function of the amount of aberrations.

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“…Adaptive optical (AO) systems have been successfully applied to FSO to compensate the distorted wave front [3][4][5][6][7][8][9]. Based on the phase-conjugation principle, traditionally there are two main branches.…”

Section: Introductionmentioning

confidence: 99%

“…Reference [7] proposes a method to process Shack-Hartmann data by a focal-plane approach. This method is more favorable in noise propagation, compared to classical Shack-Hartmann, and senses more phase modes with fewer subapertures under a comparable computation burden.…”

Section: Introductionmentioning

confidence: 99%

Hybrid Atmospheric Compensation in Free-Space Optical Communication

Wang¹,

Zhao²

2016

Journal of the Optical Society of Korea

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Since the direct-gradient (DG) method uses the Shack-Hartmann wave front sensor (SH-WFS), based on the phase-conjugation principle, for atmospheric compensation in free-space optical (FSO) communication, it cannot effectively correct high-order aberrations. While the stochastic parallel gradient descent (SPGD) can compensate the distorted wave front, it requires more calculations, which is sometimes undesirable for an FSO system. A hybrid compensation (HC) method is proposed by properly using the DG method and SPGD algorithm to improve the performance of FSO communication. Simulations show that this method can well compensate wave-front aberrations and upgrade the coupling efficiency with few computations, preferable correction results, and rapid convergence rate.

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Sensing more modes with fewer sub-apertures: the LIFTed Shack–Hartmann wavefront sensor

Cited by 9 publications

References 11 publications

LIFT: analysis of performance in a laser assisted adaptive optics

LIFT: analysis of performance in a laser assisted adaptive optics

Adaptive optics for in vivo two-photon calcium imaging of neuronal networks

Hybrid Atmospheric Compensation in Free-Space Optical Communication

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