Relevant bibliographies by topics / Wavefront correction

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Wavefront correction'

Author: Grafiati
Published: 4 June 2021
Last updated: 31 January 2023

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Journal articles on the topic "Wavefront correction"

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Qiu, Xuejing, Tao Cheng, Lingxi Kong, Shuai Wang, and Bing Xu. "A Single Far-Field Deep Learning Adaptive Optics System Based on Four-Quadrant Discrete Phase Modulation." Sensors 20, no. 18 (September 8, 2020): 5106. http://dx.doi.org/10.3390/s20185106.

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In adaptive optics (AO), multiple different incident wavefronts correspond to a same far-field intensity distribution, which leads to a many-to-one mapping. To solve this problem, a single far-field deep learning adaptive optics system based on four-quadrant discrete phase modulation (FQDPM) is proposed. Our method performs FQDPM on an incident wavefront to overcome this many-to-one mapping, then convolutional neural network (CNN) is used to directly predict the wavefront. Numerical simulations indicate that the proposed method can achieve precise high-speed wavefront correction with a single far-field intensity distribution: it takes nearly 0.6ms to complete wavefront correction while the mean root mean square (RMS) of residual wavefronts is 6.3% of that of incident wavefronts, and the Strehl ratio of the far-field intensity distribution increases by 5.7 times after correction. In addition, the experiment results show that mean RMS of residual wavefronts is 6.5% of that of incident wavefronts and it takes nearly 0.5 ms to finish wavefront reconstruction, which verifies the correctness of our proposed method.
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Zhang, Hong Xin, and Xiao Xi Xu. "High-Resolution Correction of Arbitrary Wavefront Aberration Using Liquid Crystal Spatial Light Modulator." Applied Mechanics and Materials 121-126 (October 2011): 877–81. http://dx.doi.org/10.4028/www.scientific.net/amm.121-126.877.

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Wavefront correction plays significant role in some fields like astronomical observation, laser processing and medical imaging, etc. Liquid crystal spatial light modulator ( LC SLM) is an ideal device for high-resolution wavefront correction because of its low cost, low consumption, large number of pixels and independent programming control of each unit. It is researched experimentally that LC SLM is used as a wavefront correction device and corrects arbitrary wavefront aberration. Wavefront correction is performed based on phase conjugation and periodic phase modulation with modulo-2π. The experimental results show that the PV value of the irregular wavefront aberration is 1.56λ, RMS value is 0.25 and Strehl ratio is 0.08 before correction, but the PV value of the residual aberration is reduced to 0.26λ, RMS value is 0.02 and Strehl ratio is increased to 0.97 which is approximated diffraction limit after correction. It is proved to be feasible and effective that LC SLM is used to the high-precision and high-resolution wavefront correction.
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Zheng, Yamin, Ming Lei, Shibing Lin, Deen Wang, Qiao Xue, and Lei Huang. "Filtered Influence Function of Deformable Mirror for Wavefront Correction in Laser Systems." Photonics 8, no. 10 (September 23, 2021): 410. http://dx.doi.org/10.3390/photonics8100410.

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An influence function filtering method (IFFM) is presented to improve the wavefront correction capability in laser systems by curbing the correction performance degradation resulted from the IF measurement noise. The IFFM is applied to the original measured IF. The resulting filtered IF is then used to calculate the wavefront control signal in each iteration of the closed-loop correction. A theoretical wavefront correction analysis model (CAM) is built. The impact of the IF measurement noise as well as the improvement of the IFFM on the wavefront correction capability are analyzed. A simulation is set up to analyze the wavefront correction capability of the filtered IF using Zernike mode aberrations. An experiment is carried out to study the effectiveness of the IFFM under practical conditions. Simulation and experimental results indicate that the IFFM could effectively reduce the negative effect of the measurement noise and improve the wavefront correction capability in laser systems. The IFFM requires no additional hardware and does not affect the correction speed.
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Dhamgaye, Vishal, David Laundy, Sara Baldock, Thomas Moxham, and Kawal Sawhney. "Correction of the X-ray wavefront from compound refractive lenses using 3D printed refractive structures." Journal of Synchrotron Radiation 27, no. 6 (October 19, 2020): 1518–27. http://dx.doi.org/10.1107/s1600577520011765.

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A refractive phase corrector optics is proposed for the compensation of fabrication error of X-ray optical elements. Here, at-wavelength wavefront measurements of the focused X-ray beam by knife-edge imaging technique, the design of a three-dimensional corrector plate, its fabrication by 3D printing, and use of a corrector to compensate for X-ray lens figure errors are presented. A rotationally invariant corrector was manufactured in the polymer IP-STM using additive manufacturing based on the two-photon polymerization technique. The fabricated corrector was characterized at the B16 Test beamline, Diamond Light Source, UK, showing a reduction in r.m.s. wavefront error of a Be compound refractive Lens (CRL) by a factor of six. The r.m.s. wavefront error is a figure of merit for the wavefront quality but, for X-ray lenses, with significant X-ray absorption, a form of the r.m.s. error with weighting proportional to the transmitted X-ray intensity has been proposed. The knife-edge imaging wavefront-sensing technique was adapted to measure rotationally variant wavefront errors from two different sets of Be CRL consisting of 98 and 24 lenses. The optical aberrations were then quantified using a Zernike polynomial expansion of the 2D wavefront error. The compensation by a rotationally invariant corrector plate was partial as the Be CRL wavefront error distribution was found to vary with polar angle indicating the presence of non-spherical aberration terms. A wavefront correction plate with rotationally anisotropic thickness is proposed to compensate for anisotropy in order to achieve good focusing by CRLs at beamlines operating at diffraction-limited storage rings.
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Yang, Huizhen, Zhen Zhang, and Jian Wu. "Performance Comparison of Wavefront-Sensorless Adaptive Optics Systems by Using of the Focal Plane." International Journal of Optics 2015 (2015): 1–8. http://dx.doi.org/10.1155/2015/985351.

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The correction capability and the convergence speed of the wavefront-sensorless adaptive optics (AO) system are compared based on two different system control algorithms, which both use the information of focal plane. The first algorithm is designed through the linear relationship between the second moment of the aberration gradients and the masked far-field intensity distribution and the second is stochastic parallel gradient descent (SPGD), which is the most commonly used algorithm in wavefront-sensorless AO systems. A wavefront-sensorless AO model is established with a 61-element deformable mirror (DM) and a CCD. Performance of the two control algorithms is investigated and compared through correcting different wavefront aberrations. Results show that the correction ability of AO system based on the proposed control algorithm is obviously better than that of AO system based on SPGD algorithm when the wavefront aberrations increase. The time needed by the proposed control algorithm is much less than that of SPGD when the AO system achieves similar correction results. Additionally, the convergence speed of the proposed control algorithm is independent of the turbulence strength while the number of intensity measurements needed by SPGD increases as the turbulence strength magnifies.
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Applegate, Ray, David Atchison, Arthur Bradley, Adrian Bruce, Michael Collins, Jason Marsack, Scott Read, Larry N. Thibos, and Geunyoung Yoon. "Wavefront Refraction and Correction." Optometry and Vision Science 91, no. 10 (October 2014): 1154–55. http://dx.doi.org/10.1097/opx.0000000000000373.

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Yamada, Jumpei, Takato Inoue, Nami Nakamura, Takashi Kameshima, Kazuto Yamauchi, Satoshi Matsuyama, and Makina Yabashi. "X-Ray Single-Grating Interferometry for Wavefront Measurement and Correction of Hard X-Ray Nanofocusing Mirrors." Sensors 20, no. 24 (December 21, 2020): 7356. http://dx.doi.org/10.3390/s20247356.

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X-ray single-grating interferometry was applied to conduct accurate wavefront corrections for hard X-ray nanofocusing mirrors. Systematic errors in the interferometer, originating from a grating, a detector, and alignment errors of the components, were carefully examined. Based on the measured wavefront errors, the mirror shapes were directly corrected using a differential deposition technique. The corrected X-ray focusing mirrors with a numerical aperture of 0.01 attained two-dimensionally diffraction-limited performance. The results of the correction indicate that the uncertainty of the wavefront measurement was less than λ/72 in root-mean-square value.
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Nobis, Thomas. "Impact of Pupil Aberrations on Wavefront Manipulation." EPJ Web of Conferences 255 (2021): 03004. http://dx.doi.org/10.1051/epjconf/202125503004.

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A systematic and quantitative analysis is given of the impact of pupil aberrations on the imaging performance in wavefront manipulation applications using adaptive optical elements. For the practical case of rotationally-symmetric types of wavefront corrections, such as defocus or spherical aberration, analytical expressions of the induced aberrations are derived including their pupil and field dependence. Each aberration is thereby related to the specific pupil aberration present at the adaptive element. The results can be used to specify the acceptable amount of pupil correction required for a specific magnitude and type of wavefront manipulation.
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Zhang, Zhentao, Nazim Bharmal, Tim Morris, and Yonghui Liang. "Laboratory quantification of a plenoptic wavefront sensor with extended objects." Monthly Notices of the Royal Astronomical Society 497, no. 4 (August 5, 2020): 4580–86. http://dx.doi.org/10.1093/mnras/staa2269.

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ABSTRACT Adaptive optics (AO) is widely used in ground-based telescopes to compensate the effects of atmosphere distortion, and the wavefront sensor is a significant component in the AO systems. The plenoptic wavefront sensor has been proposed as an alternative wavefront sensor adequate for extended objects and wide field of views. In this paper, a experimental bench has been set up to investigate the slope measurement accuracy and closed-loop wavefront correction performance for extended objects. From the experimental results, it has been confirmed that plenoptic wavefront sensor is suitable for extended objects wavefront sensing with proper optical design. The slope measurements have a good linearity and accuracy when observing extended objects. The image quality is significantly improved after closed-loop correction. A method of global tip/tilt measurement using only plenoptic wavefront sensor frame is proposed in this paper, it is also a potential advantage of plenoptic wavefront sensor in extended objects wavefront sensing.
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Li, Jin, Luwei Wang, Yong Guo, Yangrui Huang, Zhigang Yang, Wei Yan, and Junle Qu. "Study on Aberration Correction of Adaptive Optics Based on Convolutional Neural Network." Photonics 8, no. 9 (September 8, 2021): 377. http://dx.doi.org/10.3390/photonics8090377.

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The existence of aberrations has always been an important limiting factor in the imaging field. Especially in optical microscopy imaging, the accumulated aberration of the optical system and the biological samples distorts the wavefront on the focal plane, thereby reducing the imaging resolution. Here, we propose an adaptive optical aberration correction method based on convolutional neural network. By establishing the relationship between the Zernike polynomial and the distorted wavefront, with the help of the fast calculation advantage of an artificial intelligence neural network, the distorted wavefront information can be output in a short time for the reconstruction of the wavefront to achieve the purpose of improving imaging resolution. Experimental results show that this method can effectively compensate the aberrations introduced by the system, agarose and HeLa cells. After correcting, the point spread function restored the doughnut-shape, and the resolution of the HeLa cell image increased about 20%.
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Dissertations / Theses on the topic "Wavefront correction"

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Varslot, Trond. "Wavefront aberration correction in medical ultrasound imaging." Doctoral thesis, Norwegian University of Science and Technology, Department of Mathematical Sciences, 2004. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-1906.

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Medisinsk ultralydavbildning er et relativt rimelig verktøy som er i utstrakte bruk på dagens sykehus og tildels også legekontor. En underliggende antakelse ved dagens avbildningsteknikker er at vevet som skal avbildes i grove trekk er homogent. Det vil i praksis si at de akustiske egenskapene varierer lite. I tilfeller der denne forutsetningen ikke holder vil resultatet bli betraktlig reduksjon av bildekvaliteten. Prosjektet har fokusert på hvordan man best mulig kan korrigere for denne kvalitetsforringelsen. Arbeidet har resultert i et styrket teoretisk rammeverk for modellering, programvare for numerisk simulering. Rammeverket gir en felles forankring for tidligere publiserte metoder som "time-reversal mirror", "beamsum-correlation" og "speckle brightness", og gir derfor en utvidet forståelse av disse metodene. Videre har en ny metode blitt utviklet basert på egenfunksjonsanalyse av et stokastisk tilbakespredt lydfelt. Denne metoden vil potensielt kunne håndtere sterk spredning fra områder utenfor hovedaksen til ultralydstrålen på en bedre måte enn tidligere metoder. Arbeidet er utført ved Institutt for matematiske fag, NTNU, med professor Harald Krogstad, Institutt for matematiske fag, som hovedveileder og professor Bjørn Angelsen, Institutt for sirkulasjon og bildediagnostikk, som medveileder.

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Lawrence, Ryan Christopher 1975. "Active wavefront correction in laser interferometric gravitational wave detectors." Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/29308.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 2003.
Includes bibliographical references (p. 239-243).
As the first generation of laser interferometric gravitational wave detectors near operation, research and development has begun on increasing the instrument's sensitivity while utilizing existing infrastructure. In the Laser Interferometer Gravitational Wave Observatory (LIGO), significant improvements are being planned for installation in 2007 to increase the sensitivity to test mass displacement, hence sensitivity to gravitational wave strain, by improved suspensions and test mass substrates, active seismic isolation, and higher input laser power. Even with the highest quality optics available today, however, finite absorption of laser power within transmissive optics, coupled with the tremendous amount of optical power circulating in various parts of the interferometer, result in critical wavefront deformations which will cripple the performance of the instrument. Discussed is a method of active wavefront correction via direct thermal actuation on optical elements of the interferometer; or, "thermally adaptive optics". A simple nichrome heating element suspended off the face of an affected optic will, through radiative heating, remove the gross axisymmetric part of the original thermal distortion. A scanning heating laser- will then be used to remove any remaining non-axisymmetric wavefront distortion, generated by inhomogeneities in the substrate's absorption, thermal conductivity, etc. This work includes a quantitative analysis of both techniques of thermal compensation, as well as the results of a proof-of-principle experiment which verified the technical feasibility of each technique.
by Ryan Christopher Lawrence.
Ph.D.
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Monjardin-Lopez, Jesus Fernando. "Wavefront characterisation and beam correction for high power diode laser arrays." Thesis, Heriot-Watt University, 2006. http://hdl.handle.net/10399/2014.

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Holmberg, Mei-Li, and Linnea Johansson. "Wavefront Sensor with Astigmatism Correction for Measurements on the Human Eye." Thesis, KTH, Skolan för teknikvetenskap (SCI), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-210856.

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When conducting experiments on the human eye it is sometimes required to correct some form of astigmatism. A fexible and cost effective way to achieve this is using two identical cross-cylinder lenses, as described in the article ‘Adaptive Astigmatism-Correcting Device for Eyepieces' by Arines and Acosta. When rotating these lenses the strength and angle can be adjusted to correct for different types of astigmatism.The measurements were made on two identical SR = +2 D, CR = - 4 D lenseson rotating mounts. A Shack-Hartmann wavefront sensor detected the change in a beam of collimated light directed through the lenses. Two types of measurements were conducted, to record the results of just the relative angle between the lenses and to find the aberrations the lenses themselves introduce to the system in combination with rotation. The two-lens-system we created adhered well to the theory and the results obtained by Arines and Acosta, although we obtained a slight variation in our values. The minimum cylindrical strength was close to -9 D and the aberrations were very small (< 0:01 μm). The reasons for these systematic errors are discussed but for the purposes of aiding in visual optics research this solution is well suited for its ease of use, and cost effectiveness.
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Colucci, D'nardo. "Atmospheric wavefront sensing and correction including the stellar phase shifting interferometer." Diss., The University of Arizona, 1993. http://hdl.handle.net/10150/186571.

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Because atmospheric turbulence causes distortions in stellar wavefronts, passive ground based telescopes, no matter how large, are limited to the resolution limit of a 0.1-0.2m aperture when imaging in the visible. If the new class of large aperture (10 m) telescopes is to reach its resolution potential, adaptive optics must be employed to compensate for the atmospheric wavefront distortions. Vital to an adaptive optics system is the ability to accurately sense the distorted wavefront. Two new methods for wavefront sensing show great promise for the field of adaptive optics. A reflective hybrid of the traditional Shack-Hartmann wavefront sensor has produced near diffraction limited imaging with the Multiple Mirror Telescope, a hexagonal array of six, 1.83 m mirrors. It is also directly applicable to filled aperture telescopes. Another wavefront sensor, the stellar phase shifting interferometer, has produced for the first time ever direct phase map measurements of atmospherically distorted wavefronts. The ability to directly measure the phase of the wavefront at each detector pixel paves the way for a new generation of light efficient and accurate wavefront sensors for adaptive optics.
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Riggs, A. J. Eldorado. "Integrated Wavefront Correction and Bias Estimation for the High-Contrast Imaging of Exoplanets." Thesis, Princeton University, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10120340.

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Just over two decades ago the first planet outside our solar system was found, and thousands more have been discovered since. Nearly all these exoplanets were indirectly detected by sensing changes in their host stars' light. However, exoplanets must be directly imaged to determine their atmospheric compositions and the orbital parameters unavailable from only indirect detections. The main challenge of direct imaging is to observe stellar companions much fainter than the star and at small angular separations. Coronagraphy is one method of suppressing stellar diffraction to provide high star-to-planet contrast, but coronagraphs are extremely sensitive to quasi-static aberrations in the optical system. Active correction of the stellar wavefront is performed with deformable mirrors to recover high-contrast regions in the image. Estimation and control of the stellar electric field is performed iteratively in the camera's focal plane to avoid non-common path aberrations arising from a separate pupil sensor. Estimation can thus be quite time consuming because it requires several high-contrast intensity images per correction iteration.

This thesis focuses on efficient focal plane wavefront correction (FPWC) for coronagraphy. Time is a precious commodity for a space telescope, so there is a strong incentive to reduce the total exposure time required for focal plane wavefront estimation. Much of our work emphasizes faster, more robust estimation via Kalman filtering, which optimally combines prior data with new measurements. The other main contribution of this thesis is a paradigm shift in the use of estimation images. Time for FPWC has generally been considered to be lost overhead, but we demonstrate that estimation images can be used for the detection and characterization of exoplanets and disks. These science targets are incoherent with their host stars, so we developed and implemented an iterated extended Kalman filter (IEKF) for simultaneous estimation of the stellar electric field and the incoherent signal. From simulations and testbed experiments, we report the increased FPWC speed enabled by Kalman filtering and the use of the IEKF for exoplanet detection during FPWC. We discuss the relevance and future directions of this work for planned or proposed coronagraph missions.

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Huang, Lei, Chenlu Zhou, Mali Gong, Xingkun Ma, and Qi Bian. "Development of a novel three-dimensional deformable mirror with removable influence functions for high precision wavefront correction in adaptive optics system." SPIE-INT SOC OPTICAL ENGINEERING, 2016. http://hdl.handle.net/10150/622017.

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Deformable mirror is a widely used wavefront corrector in adaptive optics system, especially in astronomical, image and laser optics. A new structure of DM-3D DM is proposed, which has removable actuators and can correct different aberrations with different actuator arrangements. A 3D DM consists of several reflection mirrors. Every mirror has a single actuator and is independent of each other. Two kinds of actuator arrangement algorithm are compared: random disturbance algorithm (RDA) and global arrangement algorithm (GAA). Correction effects of these two algorithms and comparison are analyzed through numerical simulation. The simulation results show that 3D DM with removable actuators can obviously improve the correction effects.
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Radner, Hannes, Lars Büttner, and Jürgen Czarske. "Interferometric velocity measurements through a fluctuating interface using a Fresnel guide star-based wavefront correction system." SPIE, 2018. https://tud.qucosa.de/id/qucosa%3A71762.

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To improve optical measurements, which are degraded by optical distortions, wavefront correction systems can be used. Generally, these systems evaluate a guide star in transmission. The guide star emits wellknown wavefronts, which sample the distortion by propagating through it. The system is able to directly measure the distortion and correct it. There are setups, where it is not possible to generate a guide star behind the distortion. Here, we consider a liquid jet with a radially open surface. A Mach–Zehnder interferometer is presented where both beams are stabilized through a fluctuating liquid jet surface with the Fresnel guide star (FGS) technique. The wavefront correction system estimates the beam path behind the surface by evaluating the incident beam angle and reflected beam angle of the Fresnel reflex with an observer to control the incident angle for the desired beam path. With this approach, only one optical access through the phase boundary is needed for the measurement, which can be traversed over a range of 250 μm with a significantly increased rate of valid signals. The experiment demonstrates the potential of the FGS technique for measurements through fluctuating phase boundaries, such as film flows or jets.
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Salmon, Anne. "Higher-order aberrations in amblyopia : an analysis of pre- and post-wavefront-guided laser refractive correction." Thesis, Aston University, 2015. http://publications.aston.ac.uk/25159/.

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For more than a century it has been known that the eye is not a perfect optical system, but rather a system that suffers from aberrations beyond conventional prescriptive descriptions of defocus and astigmatism. Whereas traditional refraction attempts to describe the error of the eye with only two parameters, namely sphere and cylinder, measurements of wavefront aberrations depict the optical error with many more parameters. What remains questionable is the impact these additional parameters have on visual function. Some authors have argued that higher-order aberrations have a considerable effect on visual function and in certain cases this effect is significant enough to induce amblyopia. This has been referred to as ‘higher-order aberration-associated amblyopia’. In such cases, correction of higher-order aberrations would not restore visual function. Others have reported that patients with binocular asymmetric aberrations display an associated unilateral decrease in visual acuity and, if the decline in acuity results from the aberrations alone, such subjects may have been erroneously diagnosed as amblyopes. In these cases, correction of higher-order aberrations would restore visual function. This refractive entity has been termed ‘aberropia’. In order to investigate these hypotheses, the distribution of higher-order aberrations in strabismic, anisometropic and idiopathic amblyopes, and in a group of visual normals, was analysed both before and after wavefront-guided laser refractive correction. The results show: (i) there is no significant asymmetry in higher-order aberrations between amblyopic and fixing eyes prior to laser refractive treatment; (ii) the mean magnitude of higher-order aberrations is similar within the amblyopic and visually normal populations; (iii) a significant improvement in visual acuity can be realised for adult amblyopic patients utilising wavefront-guided laser refractive surgery and a modest increase in contrast sensitivity was observed for the amblyopic eye of anisometropes following treatment (iv) an overall trend towards increased higher-order aberrations following wavefront-guided laser refractive treatment was observed for both visually normal and amblyopic eyes. In conclusion, while the data do not provide any direct evidence for the concepts of either ‘aberropia’ or ‘higher-order aberration-associated amblyopia’, it is clear that gains in visual acuity and contrast sensitivity may be realised following laser refractive treatment of the amblyopic adult eye. Possible mechanisms by which these gains are realised are discussed.
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Herscovici-Schiller, Olivier. "Analyse et correction de surface d’onde post-coronographique pour l’imagerie d’exoplanètes." Thesis, Paris Sciences et Lettres (ComUE), 2018. http://www.theses.fr/2018PSLEO022/document.

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L’imagerie d’exoplanètes est limitée par deux obstacles intrinsèques : le faible écart angulaire entre planète et étoile, et le très faible flux lumineux en provenance de la planète par rapport à la lumière de l’étoile. Le premier obstacle est surmonté par l’utilisation de très grands télescopes, de la classe des dix mètres de diamètre, et éventuellement depuis le sol de systèmes d’optique adaptative, qui permettent d’atteindre de hautes résolutions angulaires. Le deuxième obstacle est surmonté par l’utilisation de coronographes. Les coronographes sont des instruments conçus pour filtrer la lumière de l’étoile tout en laissant passer la lumière de l’environnement circumstellaire. Cependant, toute aberration optique en amont du coronographe engendre des fuites de lumière stellaire à travers le coronographe. Ces fuites se traduisent par un fouillis de tavelures dans les images scientifiques, tavelures qui cachent d’éventuelles planètes. Il est donc nécessaire de mesurer et de corriger les aberrations quasi-statiques à l’origine des tavelures. Cette thèse présente des contributions théoriques, numériques et expérimentales à la mesure et à la correction des aberrations des imageurs coronographiques. La première partie décrit le contexte et présente la méthode de la diversité de phase coronographique, un formalisme qui considère l’analyse de surface d’onde post-coronographique comme un problème inverse posé dans un cadre bayésien. La deuxième partie concerne l’imagerie depuis le sol. Elle présente tout d’abord une expression analytique permettant de modéliser l’imagerie coronographique en présence de turbulence, puis l’extension de la méthode de diversité de phase coronographique à la mesure depuis les télescopes au sol donc en présence de turbulence résiduelle, et enfin une validation en laboratoire de cette méthode étendue. La troisième partie est consacrée aux futurs imageurs spatiaux à très hauts contrastes pour lesquels il faut corriger non pas seulement la phase mais tout le champ complexe. Elle présente la validation en laboratoire de la mesure d’un champ complexe d’aberrations par diversité de phase coronographique, ainsi que des premiers résultats d’extinction de la lumière en plan focal par une méthode non linéaire, le non-linear dark hole
Exoplanet imaging has two intrinsic limitations, namely the small angular separation between the star and the planet, and the very low light flux from the planet compared to the starlight. The first limitation is overcome by using very large telescopes of the ten-metre diameter class, and, for ground-based telescopes, adaptive optics systems, which allow high angular resolution imaging. The second limitation is overcome by using a coronagraph. Coronagraphs are optical devices which filter the starlight while granting passage to the light coming from the stellar environment. However, any optical aberration upstream of the coronagraph causes some of the starlight to leak through the coronagraph. This unfiltered starlight in turn causes speckles in the scientific images, and the light of the planets that could be there is lost among the speckles. Consequently, measurement and correction of the quasi-static aberration which generate the speckles are necessary for the exoplanet imagers to achieve their full potential. This thesis introduces theoretical, numerical, and experimental contributions to the topic of measurement and correction of the aberrations in coronagraphic imagers. The first part describes the context and introduces coronagraphic phase diversity, which is a Bayesian inverse problem formalism for post-coronagraphic wave-front sensing. The second part is focused on ground-based imaging. It introduces an analytic expression for coronagraphic imaging through turbulence, the extension of coronagraphic phase diversity to on-sky measurement through residual turbulence, and a laboratory validation of the extended method. The third part is concerned with future high-contrast space-based imagers, which will require not only phase correction, but a full complex wave-front correction. It presents the laboratory validation of coronagraphic phase diversity as a post-coronagraphic complex wave-front sensor, and first results of active contrast enhancement in the focal plane through thecreation of a non-linear dark hole
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Books on the topic "Wavefront correction"

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Wavefront optics for vision correction. Bellingham, Wash: SPIE Press, 2008.

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Dai, Guang-ming. Wavefront Optics for Vision Correction. Society of Photo-Optical Instrumentation Engineers, 2008. http://dx.doi.org/10.1117/3.769212.

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(Editor), Ronald Krueger, Scott MacRae (Editor), and Raymond Applegate (Editor), eds. Wavefront Customized Visual Correction: The Quest for Super Vision II. Slack Incorporated, 2003.

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(Editor), Ronald Krueger, Scott MacRae (Editor), and Raymond Applegate (Editor), eds. Wavefront Customized Visual Correction: The Quest for Super Vision II PDF CD-ROM. Slack Incorporated, 2004.

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Cleary, Georgia, Allon Barsam, and Eric Donnenfeld. Refractive surgery. Oxford University Press, 2016. http://dx.doi.org/10.1093/med/9780199672516.003.0004.

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In a perfect optical system, a point source of light is focused onto a single point on the image plane; in the eye, light is focused on the retina. Optical aberrations are caused by imaging system imperfections which cause deviations in the transmission of light, preventing the convergence of light to a single point of focus. In recent years an increased understanding of higher-order wavefront aberrations has allowed improvements in both the measurement and treatment of refractive error. This chapter discusses refractive surgery. It details refractive error, aberrations, and presbyopia, along with preoperative evaluation for refractive surgery, laser refractive surgery, other corneal refractive procedures, refractive lens surgery, intraocular lenses, phakic intraocular lenses, and presbyopia correction.
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Book chapters on the topic "Wavefront correction"

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Tyson, Robert K., and Benjamin W. Frazier. "Wavefront Correction." In Principles of Adaptive Optics, 193–220. 5th ed. Boca Raton: CRC Press, 2022. http://dx.doi.org/10.1201/9781003140191-7.

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Sinjab, Mazen M., and Arthur B. Cummings. "Introduction to Wavefront Science." In Customized Laser Vision Correction, 65–93. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-72263-4_2.

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Awwad, Shady T., Sam Arba Mosquera, and Shweetabh Verma. "Corneal Wavefront-Guided Ablation." In Customized Laser Vision Correction, 167–84. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-72263-4_5.

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Shaheen, Mohamed Shafik, Ahmed Shalaby Bardan, and Hani Ezzeldin. "Ocular Wavefront-Guided Treatment." In Customized Laser Vision Correction, 185–205. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-72263-4_6.

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Chériaux, G., F. Druon, A. Maksimchuk, M. Nantel, G. Vdovin, and G. Mourou. "Wavefront Correction of High Intensity Femtosecond Lasers." In Springer Series in Chemical Physics, 90–91. Berlin, Heidelberg: Springer Berlin Heidelberg, 1998. http://dx.doi.org/10.1007/978-3-642-72289-9_27.

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Gross, Erik, and Seema Somani. "Variable Spot Scanning and Wavefront-Guided Laser Vision Correction." In Aberration-Free Refractive Surgery, 171–92. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-642-18161-0_10.

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Nishikawa, Jun, Yutaka Hayano, Naruhisa Takato, Motokazu Noguchi, Masanori Iye, Kohichiro Morita, and Masato Ishiguro. "Minimum Redundant Aperture Masking Interferometry with Tip-Tilt Wavefront Correction." In Very High Angular Resolution Imaging, 296–98. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-0880-5_50.

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Toadere, F. "A Study about Human Eyes Wavefront Aberrations Capture and Correction." In IFMBE Proceedings, 101–4. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-04292-8_23.

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Schäfer, Bernd, Bernhard Flöter, Tobias Mey, and Klaus Mann. "Correction to: Wavefront and Coherence Characteristics of Extreme UV and Soft X-ray Sources." In Topics in Applied Physics, C1. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-34413-9_25.

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Durán, V., V. Climent, J. Lancis, E. Tajahuerce, S. Bará, J. Arines, J. Ares, P. Andrés, and Z. Jaroszewicz. "Dynamic Wavefront Sensing and Correction with Low-Cost Twisted Nematic Spatial Light Modulators." In Information Optics and Photonics, 63–76. New York, NY: Springer New York, 2010. http://dx.doi.org/10.1007/978-1-4419-7380-1_5.

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Conference papers on the topic "Wavefront correction"

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Gehner, Andreas, Michael Wildenhain, and Hubert K. Lakner. "Micromirror arrays for wavefront correction." In Micromachining and Microfabrication, edited by M. Edward Motamedi and Rolf Goering. SPIE, 2000. http://dx.doi.org/10.1117/12.396506.

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Andersen, Geoff. "High-speed Holographic Wavefront Correction." In Adaptive Optics: Analysis, Methods & Systems. Washington, D.C.: OSA, 2016. http://dx.doi.org/10.1364/aoms.2016.aom4c.3.

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Williams, David. "Emerging Ocular Applications of Wavefront Correction." In Frontiers in Optics. Washington, D.C.: OSA, 2016. http://dx.doi.org/10.1364/fio.2016.fth4i.1.

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Murray, L. P., J. C. Dainty, and E. Daly. "Wavefront correction through image sharpness maximisation." In OPTO-Ireland, edited by Fionn D. Murtagh. SPIE, 2005. http://dx.doi.org/10.1117/12.605161.

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Cornelissen, S. A., P. A. Bierden, T. G. Bifano, R. H. Webb, S. Burns, and S. Pappas. "Correction of large amplitude wavefront aberrations." In 5th International Workshop on Adaptive Optics for Industry and Medicine, edited by Wenhan Jiang. SPIE, 2005. http://dx.doi.org/10.1117/12.669370.

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Phillion, Donald W., Scot S. Olivier, Kevin Baker, Lynn Seppala, and Stacie Hvisc. "Tomagraphic wavefront correction for the LSST." In SPIE Astronomical Telescopes + Instrumentation. SPIE, 2006. http://dx.doi.org/10.1117/12.673770.

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Horie, Masaaki, Jun Nishikawa, Masahito Oya, Naoshi Murakami, Lyu Abe, Ryo Waki, Shiomi Kumagai, Motohide Tamura, Takashi Kurokawa, and Hiroshi Murakami. "Wavefront correction inside unbalanced nulling interferometer." In SPIE Astronomical Telescopes + Instrumentation, edited by Françoise Delplancke, Jayadev K. Rajagopal, and Fabien Malbet. SPIE, 2012. http://dx.doi.org/10.1117/12.926737.

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Scheidt, Dennis, and Pedro A. Quinto-Su. "Compressive wavefront correction with Bessel beams." In Laser Beam Shaping XXII, edited by Angela Dudley and Alexander V. Laskin. SPIE, 2022. http://dx.doi.org/10.1117/12.2634614.

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Artzner, G. "Static Wavefront Correction By Linnik Interferometry." In 1988 International Congress on Optical Science and Engineering, edited by Andre Masson, Joachim J. Schulte-in-den-Baeumen, and Hannfried Zuegge. SPIE, 1989. http://dx.doi.org/10.1117/12.949384.

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Paniagua-Diaz, Alba Maria, and Pablo Artal. "Wavefront shaping for intraocular scattering correction." In Imaging Systems and Applications. Washington, D.C.: OSA, 2021. http://dx.doi.org/10.1364/isa.2021.itu1d.2.

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Reports on the topic "Wavefront correction"

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Liao, Z. Initial Demonstration of Mercury Wavefront Correction System. Office of Scientific and Technical Information (OSTI), February 2006. http://dx.doi.org/10.2172/888617.

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Hellwarth, Robert W. Unconventional Laser Guide Stars and Wavefront Correction of Blue Starlight. Fort Belvoir, VA: Defense Technical Information Center, May 2002. http://dx.doi.org/10.21236/ada407962.

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DOREN, NEALL E. Space-Variant Post-Filtering for Wavefront Curvature Correction in Polar-Formatted Spotlight-Mode SAR Imagery. Office of Scientific and Technical Information (OSTI), October 1999. http://dx.doi.org/10.2172/14165.

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Thompson, C. A., and J. Wilhelmsen. An adaptive optic for correcting low-order wavefront aberrations. Office of Scientific and Technical Information (OSTI), September 1999. http://dx.doi.org/10.2172/14416.

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