Stochastic parallel-gradient-descent technique for high-resolution wave-front phase-distortion correction

Vorontsov, Mikhail A.; Sivokon, V. P.

doi:10.1364/josaa.15.002745

Cited by 352 publications

(151 citation statements)

References 21 publications

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“…Fig. 1 schematizes the model-free approach to wavefront control using a general "quality" metric [12]. In this schematized laser communication receiver system, the launched beam's wavefront phase is distorted by atmospheric turbulence encountered along its propagation path.…”

Section: Model-free Control For Adaptive Opticsmentioning

confidence: 99%

Image sharpness and beam focus VLSI sensors for adaptive optics

Cohen

Cauwenberghs

Vorontsov³

2002

IEEE Sensors J.

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Section: Model-free Control For Adaptive Opticsmentioning

confidence: 99%

Image sharpness and beam focus VLSI sensors for adaptive optics

Cohen

Cauwenberghs

Vorontsov³

2002

IEEE Sensors J.

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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%

“…Therefore the typically used sensors will fall short when high speed of detection and correction are needed, to implement fast adaptive optics in the FSO system. The other branch is the wave-front sensorless optimization method [3,9], which aims to optimize the performance metrics of the received laser, such as Strehl ratio (SR), root mean square (RMS) and image sharpness functions, etc. The AO system searches for the suitable voltage to control the DM to optimize the performance metric.…”

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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“…Optimization of the image quality metric was performed with the parallel stochastic-gradient-descent (PSGD) algorithm, which is based on estimating the gradient ∇ V Q(V ) by applying random perturbations to the input signals 18 . It is applicable to systems where there are many input signals and a performance metric that can be quantified, but no model information is available to relate the performance metric to the inputs.…”

Section: Deformable Mirror Shape Optimization and Controlmentioning

confidence: 99%

“…It is applicable to systems where there are many input signals and a performance metric that can be quantified, but no model information is available to relate the performance metric to the inputs. A derivation and justification of the approach can be found in 18 and the algorithm found in 19 is as follows.…”

Section: Deformable Mirror Shape Optimization and Controlmentioning

confidence: 99%

Adaptive scanning optical microscope (ASOM) for large workspace micro-robotic applications

Potsaid

Wen

Bellouard

Proceedings 2006 IEEE International Conference on Robotics and Automation, 2006. ICRA 2006.

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For a wide range of applications in biology, medicine, and manufacturing, the small field of view associated with high resolution microscope systems poses a significant challenge in practice. This paper describes an optical microscope design, called the Adaptive Scanning Optical Microscope (ASOM), which uses a MEMS deformable mirror working with a specially designed scanning lens to achieve a greatly expanded field of view. Most adaptive optics systems (e.g. telescopes and ophthalmology instruments) are designed to achieve near ideal performance under nominal operating conditions and primarily use the adaptive optics element to compensate for a time varying disturbance to the wavefront that is external to the optical system. In contrast to this approach, the deformable mirror in the ASOM is an integral component of the optical system and the static (glass) optical elements have been specifically designed to match the shape correcting capabilities of the deformable mirror. Using a high speed steering mirror coordinated with the deformable mirror actuation voltages, the ASOM operates by scanning over the workspace and should achieve diffraction limited imaging over a region approximately two orders of magnitude larger in area than a traditional microscope design. With the rapid scanning capabilities allowed by the high speed steering mirror and by acquiring a complete image during each exposure, the ASOM offers advantages in dynamically reconfigurable and adaptable imaging with no agitation to the workspace. After describing the design and operating principle of the ASOM, we present results from a low cost ASOM prototype.

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Stochastic parallel-gradient-descent technique for high-resolution wave-front phase-distortion correction

Cited by 352 publications

References 21 publications

Image sharpness and beam focus VLSI sensors for adaptive optics

Image sharpness and beam focus VLSI sensors for adaptive optics

Hybrid Atmospheric Compensation in Free-Space Optical Communication

Adaptive scanning optical microscope (ASOM) for large workspace micro-robotic applications

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