Wave-front reconstruction with Hartmann–Shack sensor using a phase-retrieval method

Li, Jing; Gong, Yanzhang; Chen, Hongfu; Hu, Xinrong

doi:10.1016/j.optcom.2014.09.086

Cited by 10 publications

(7 citation statements)

References 22 publications

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“…(4) The residual wave propagating back to the Algorithm Selection Block, is switched to the SPGD Block, and then iteratively corrected based on Eq. (8). With the SPGD algorithm, the wave front is iteratively corrected until the value of the performance metric J converges.…”

Section: Proposed Hybrid Compensation Methodsmentioning

confidence: 99%

“…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%

“…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. A phase-retrieval method is used instead of the wave-front-slope method to reconstruct the wave front in reference [8]. The method provides more accurate estimation of aberrations in nearly flat wave fronts.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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Section: Proposed Hybrid Compensation Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Hybrid Atmospheric Compensation in Free-Space Optical Communication

Wang¹,

Zhao²

2016

Journal of the Optical Society of Korea

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“…A Shack–Hartmann sensor [ 11 , 12 ] measures the mean wavefront gradient on many small regions of the incident beam. The reconstitution of the mirror topography requires integration of the measured gradient [ 13 ] or analyzing the detected image iteratively [ 14 ] to limit the accumulation of measurement noise. Light field cameras [ 15 ] trade the precision of the wavefront gradient measurement with a higher sampling density and are more suitable for photographic imaging of rapidly varying scenes.…”

Section: Introductionmentioning

confidence: 99%

Calibration of Deformable Mirrors for Open-Loop Control

Leutenegger¹,

Hell²

2022

Sensors

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Deformable mirrors enable the control of wave fronts for the compensation of aberrations in optical systems and/or for beam scanning. Manufacturers of deformable mirrors typically provide calibration data that encode for the fabrication tolerances among the actuators and mirror segments to support open-loop control with high wave front fidelity and accuracy. We report a calibration method that enables users of the deformable mirrors to measure the response of the mirror itself to validate and improve the calibration data. For this purpose, an imaging off-axis Michelson interferometer was built that allowed measuring the mirror topography with high accuracy and sufficient spatial resolution. By calibrating each actuator over its entire range, the open-loop performance for our deformable mirror was improved.

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“…Lately, new algorithms have appeared, able to retrieve the phase either from the PSF or blurred image [11][12][13] with increased accuracy, or from the Shack-Hartmann wavefront measurements with an accuracy higher that is achievable with standard slopes-integration methods [14,15]. This phase can be used for direct estimation of the wavefront statistics.…”

Section: Introductionmentioning

confidence: 99%

Сomparison of on-line and off-line Fried parameter estimation methods

Soloviev¹,

Vdovin²,

Bezzubik³

2019

Naučno-teh. vestn. inf. tehnol. meh. opt.

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We address the problem of high-accuracy estimation of the Fried parameter r 0 by comparing two approaches based on estimation of statistical properties of intensity-based wavefront measurements with parameter-fitting to the theoretically predicted values. In the first approach, the phase of the aberration-degraded field is restored from the measurements to obtain the statistical estimate for the structure function. Due to the iterative nature of the most phase retrieval methods, this approach requires significant computational time and thus cannot provide results in real time. In the second approach, the structure function of the sub-aperture wavefront slopes is directly calculated and related to the turbulence parameters in real time. We describe the equations used to obtain the estimate of the Fried parameter by both methods and check their accuracy with numerical simulations.

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Wave-front reconstruction with Hartmann–Shack sensor using a phase-retrieval method

Cited by 10 publications

References 22 publications

Hybrid Atmospheric Compensation in Free-Space Optical Communication

Hybrid Atmospheric Compensation in Free-Space Optical Communication

Calibration of Deformable Mirrors for Open-Loop Control

Сomparison of on-line and off-line Fried parameter estimation methods

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