Comparing zonal reconstruction algorithms and modal reconstruction algorithms in adaptive optics system

Li, Xinyang; Jiang, Wenhan

doi:10.1117/12.451985

Cited by 18 publications

(3 citation statements)

References 7 publications

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“…If the DM were to have a better response for higher-order Zernike polynomials, the wavefront estimation could include higher order Zernike modes. Additionally, some algorithms determine the wavefront zonally in terms of its spatial distribution [36,68,69], and this is the preferred method in astronomical and ophthalmic AO [7,70]. The resolution and sampling of the wavefront sensor is usually much higher than that of the compensating element, and additional discretization and regularization must be done to ensure that the translation from the estimated wavefront to the DM pattern remains well-defined.…”

Section: Discussionmentioning

confidence: 99%

Automated sensorless single-shot closed-loop adaptive optics microscopy with feedback from computational adaptive optics

2019

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Traditional wavefront-sensor-based adaptive optics (AO) techniques face numerous challenges that cause poor performance in scattering samples. Sensorless closed-loop AO techniques overcome these challenges by optimizing an image metric at different states of a deformable mirror (DM). This requires acquisition of a series of images continuously for optimization− an arduous task in dynamic in vivo samples. We present a technique where the different states of the DM are instead simulated using computational adaptive optics (CAO). The optimal wavefront is estimated by performing CAO on an initial volume to minimize an image metric, and then the pattern is translated to the DM. In this paper, we have demonstrated this technique on a spectral-domain optical coherence microscope for three applications: real-time depth-wise aberration correction, single-shot volumetric aberration correction, and extension of depth-of-focus. Our technique overcomes the disadvantages of sensor-based AO, reduces the number of image acquisitions compared to traditional sensorless AO, and retains the advantages of both computational and hardware-based AO.

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Section: Discussionmentioning

confidence: 99%

Automated sensorless single-shot closed-loop adaptive optics microscopy with feedback from computational adaptive optics

2019

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“…( 6)- (9). The direct-gradient method was used for wavefront correction, which can calculate the control voltage of each actuator of the deformable mirror according to the wavefront gradients reconstructed by the plenoptic sensor [18][19][20]. The coefficient of each aberration was 3λ.…”

Section: B Wavefront Correction 1) Single Aberration Correctionmentioning

confidence: 99%

A Local Threshold Checkerboard Algorithm for Adaptive Optics System With a Plenoptic Sensor

et al. 2022

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Adaptive optics systems will encounter challenges under strong atmospheric turbulence conditions. Recently, a modified approach based on plenoptic sensor has attracted considerable attention. However, after wavefront correction under strong turbulence, we found that the existing wavefront reconstruction algorithm has difficulty in accurately reconstructing the residual aberrations. Therefore, we proposed a local threshold checkerboard algorithm to improve the accuracy of wavefront reconstruction by thresholding specific areas of central sub-apertures of the plenoptic sensor. In order to demonstrate the effectiveness of our algorithm, we designed and built an experimental platform. The platform included a deformable mirror, which we were able to adjust to simulate several different aberration conditions. Afterwards the directgradient method was used for correction of the residual aberrations, which were reduced to less than 0.1λ(RMS), demonstrating the effectiveness of our algorithm.

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“…Wavefront sensing is one of the most used optical techniques for non-contact and non-destructive diagnostic of spatially heterogeneous objects due to high operation rates and accuracy of measurements [17,27,19,5,2,30,18]. It provides the measurements and analysis of probe laser beam passing through the object or being reflected from its surface.…”

Section: Introductionmentioning

confidence: 99%

Aberration measurements by a Talbot wavefront sensor in the presence of intensity variations

Kotov¹,

Danko²,

Goloborodko³

2023

J. Opt. Soc. Am. B

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Paper deals with the theoretical investigations of measurement accuracy of optical aberrations by Talbot wavefront sensor in the presence of random amplitude variations. Theoretical prediction of intensity distribution for gratings of any type based on their spatial spectrum is obtained, and it is shown that grating is fully restored in Talbot plane even for the high fraction of random amplitude. The possibilities of self-imaging phenomenon is investigated based on the simulation results. Simulation results show that pit displacement error increases when the correlation length decreases or when grating spatial spectrum increases. It is found that for defocus aberration intensity variations decrease measured defocus value and increment of aberrations of same order (oblique and vertical astigmatisms).

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Comparing zonal reconstruction algorithms and modal reconstruction algorithms in adaptive optics system

Cited by 18 publications

References 7 publications

Automated sensorless single-shot closed-loop adaptive optics microscopy with feedback from computational adaptive optics

Automated sensorless single-shot closed-loop adaptive optics microscopy with feedback from computational adaptive optics

A Local Threshold Checkerboard Algorithm for Adaptive Optics System With a Plenoptic Sensor

Aberration measurements by a Talbot wavefront sensor in the presence of intensity variations

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