Low-cost high-speed control for adaptive optics

Saunter, Christopher D.; Love, Gordon D.

doi:10.1117/12.740121

Cited by 8 publications

(4 citation statements)

References 8 publications

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“…Due to its unique advantages, i.e., low cost, low power consumption, no mechanical inertia, programmable, high resolution, fast response time, it has been widely used in multi-channel imaging [1] , adaptive optics [2,3] , diffraction optical elements (DOEs) [4,5] and dynamic holographic optical tweezers [6] .…”

Section: Introductionmentioning

confidence: 99%

The study of diffractive lenses displayed in a phase-only liquid crystal spatial light modulator

Panezai

Wang

et al. 2013

SPIE Proceedings

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Phase-only spatial light modulator (SLM) based on liquid crystal on silicon (LCOS) is a kind of device based on electrically controlled birefringence effect to realize phase modulation. Due to its low cost, programmable, high resolution, fast response time, LCOS has been widely used in multi-channel imaging, adaptive optics, diffraction optical elements (DOEs), dynamic holographic, optical tweezers and other fields. It is necessary to numerically evaluate the modulation characterization of LCOS before application. Firstly, the phase modulation characterization of the LCOS (PLUTO HED6010XXX by Holoeye Company) was measured based on the Twyman-Green interferometer, and the curves of both phase shift and normalized intensity as grey level functions were obtained. Experimental results indicated that phase modulation of the LCOS could be achieved to 3.99π, and the root-mean-square value (RMS) of normalized intensity was less than 0.01, which demonstrated that LCOS could be regarded as a phase-only modulation device. This method is also suitable for the evaluation of modulation characterization of other LCOS devices. Secondly, a phase pattern of thin lens written onto LCOS was demonstrated. Because of the pixel structure of LCOS, the theory of discretization of lenses was studied. Both simulation and experimental results were obtained. The experimental results proved that the convergence character of the lens written onto LCOS was similar to optical lenses. In the experiment, the measured focal length was in a good agreement to the theoretical deduction, and the relative error (RE) of which was below 1%. Both simulation and experimental results showed that LCOS could be used as lens to converge the plane wave, and replace the optical lens successfully.

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Section: Introductionmentioning

confidence: 99%

The study of diffractive lenses displayed in a phase-only liquid crystal spatial light modulator

Panezai

Wang

et al. 2013

SPIE Proceedings

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“…As the control of the sensor and actuator regularly needs the application of some programmable logic device, it seems to be advantageous to employ both of them to fulfill the requested computation tasks as well. Recently, several FPGA-based wavefront sensors and AO system architectures have been introduced [11,12] and their attainable performance was studied comprehensively [13,14].…”

Section: Introductionmentioning

confidence: 99%

High-Speed, SAD Based Wavefront Sensor Architecture Implementation on FPGA

Kincses

Orzó

Nagy

et al. 2010

J Sign Process Syst

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Wavefront aberrations caused by turbulent or rapidly changing media can considerably degrade the performance of an imaging system. To dynamically compensate these wavefront distortions adaptive optics is applied. We developed an affordable adaptive optic system which combines CMOS sensor and Liquid Crystal on Silicon (LCOS) display technology with the Field Programmable Gate Arrays (FPGA) devices parallel computing capabilities. A high-speed, accurate wavefront sensor is an elemental part of an adaptive optic system. In the paper, an efficient FPGA implementation of the Sum of Absolute Differences (SAD) algorithm, which accomplishes the correlation-based wavefront sensing, is introduced. This architecture was implemented on a Spartan-3 FPGA which is capable of real-time (>500 fps) measuring the incoming wavefront.

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“…This way communication bottlenecks can be avoided and higher speed can be granted for a closed loop system. Several FPGA based wavefront sensor and AO system architecture was introduced so far [7,8,9]. In our AO system, according to the measured and digitally reconstructed wavefront distortions a built in LCOS device displays the corrections.…”

Section: Introductionmentioning

confidence: 99%

Implementation of a parallel SAD based wavefront sensor architecture on FPGA

Kincses

Nagy²,

Orzó³

et al. 2009

2009 European Conference on Circuit Theory and Design

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Wavefront aberration caused by turbulent or rapidly changing media can considerably degrade the performance of an imaging system. Adaptive optics can dynamically compensate these wavefront distortions and so provide corrected imaging. We developed an affordable adaptive optic system which combines CMOS sensor and LCOS display technology with the FPGA devices parallel computing capabilities. High speed and accurate wavefront sensor is fundamental part of any adaptive optic system. In this paper, an efficient FPGA implementation of the Sum of Absolute Differences (SAD) algorithm is introduced which accomplish correlation based wavefront sensing. This architecture was implemented on a Spartan-3 FPGA and capable to measure the incoming wavefront at the speed of sensor data acquisition speed.

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Low-cost high-speed control for adaptive optics

Cited by 8 publications

References 8 publications

The study of diffractive lenses displayed in a phase-only liquid crystal spatial light modulator

The study of diffractive lenses displayed in a phase-only liquid crystal spatial light modulator

High-Speed, SAD Based Wavefront Sensor Architecture Implementation on FPGA

Implementation of a parallel SAD based wavefront sensor architecture on FPGA

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