Dissertations / Theses on the topic 'Wavefront'
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FREISCHLAD, KLAUS REINHARD. "WAVEFRONT SENSING BY HETERODYNE SHEARING INTERFEROMETRY (WAVEFRONT RECONSTRUCTION)." Diss., The University of Arizona, 1986. http://hdl.handle.net/10150/183952.
Full textMahajan, Virendra N., and Eva Acosta. "Wavefront analysis from its slope data." SPIE-INT SOC OPTICAL ENGINEERING, 2017. http://hdl.handle.net/10150/626489.
Full textLundström, Linda. "Wavefront Aberrations and Peripheral Vision." Doctoral thesis, KTH, Tillämpad fysik, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4385.
Full textQC 20100809
Lundström, Linda. "Wavefront aberrations and peripheral vision /." Stockholm : Department of Applied Physics, Royal Institute of Technology, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4385.
Full textChew, Theam Yong. "Wavefront sensors in Adaptive Optics." Thesis, University of Canterbury. Electrical and Computer Engineering, 2008. http://hdl.handle.net/10092/1645.
Full textCampbell, Heather Isla. "Generalised Phase Diversity wavefront sensing." Thesis, Heriot-Watt University, 2006. http://hdl.handle.net/10399/167.
Full textPape, Ulrich v. "Wavefront sensing in the human eye." [S.l.] : [s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=963766163.
Full textMuyo, Nieto Gonzalo D. "Principles and applications of wavefront coding." Thesis, Heriot-Watt University, 2007. http://hdl.handle.net/10399/2043.
Full textWeddell, Stephen John. "Optical Wavefront Prediction with Reservoir Computing." Thesis, University of Canterbury. Electrical and Computer Engineering, 2010. http://hdl.handle.net/10092/4070.
Full textCuratu, Costin. "Wavefront Sensor for Eye Aberrations Measurements." Doctoral diss., University of Central Florida, 2009. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2274.
Full textPh.D.
Optics and Photonics
Optics and Photonics
Optics PhD
Koukourakis, N., B. Fregin, L. Büttner, and J. W. Czarske. "Adaptive wavefront shaping for flowfield measurements." SPIE, 2016. https://tud.qucosa.de/id/qucosa%3A35058.
Full textMohanty, Siddharth. "Autotuning wavefront patterns for heterogeneous architectures." Thesis, University of Edinburgh, 2015. http://hdl.handle.net/1842/10557.
Full textWilliby, Gregory Allen. "Transmitted wavefront testing of complex optics." Diss., The University of Arizona, 2003. http://hdl.handle.net/10150/289995.
Full textTan, Zhen. "Electromagnetic metagratings for efficient wavefront manipulation." Electronic Thesis or Diss., Paris 10, 2024. http://www.theses.fr/2024PA100031.
Full textCompared to traditional metasurfaces, metagratings have demonstrated pronounced advantages in efficient wavefront manipulation in recent years. These advantages primarily stem from two key factors: first, metagratings effectively eliminate wave impedance mismatch between incoming and outgoing waves, thus facilitating near-optimal efficiency in wavefront manipulation. Second, the sparsely arranged and simplified structure of metagratings renders them significantly easier to fabricate compared to traditional metasurfaces, which often entail complex structural resolution requirements particularly at high frequencies. This doctoral research endeavors to establish a more intuitive and rigorous design methodology for metagrating-based wavefront manipulation while also exploring novel avenues in the domain. Conducted jointly by Université Paris Nanterre and Xi’an Jiaotong University, the study starts with a comprehensive analysis of the electromagnetic characteristics inherent to metagratings, aiming to elucidate the fundamental principles governing wavefront manipulation. This analysis encompasses the derivation of reflection and transmission coefficients in multilayered media, examination of radiation characteristics, and meticulous considerations for achieving optimal wavefront manipulation. Subsequent investigations deal with the design intricacies of reflective metagratings, addressing challenges and devising strategies for both single-beam and multi-beam radiations and for electromagnetic absorption, exploring the influence of diverse structural configurations on absorption bandwidth. Notably, the concept of zero load-impedance metagratings is introduced and potential applications are explored particularly in high-frequency band scenarios. Finally, the research extends its exploration to transmissive metagratings, aiming to demonstrate their capabilities in achieving diverse wavefront manipulations, encompassing anomalous reflection, anomalous refraction, beam splitting, uni- and bi-directional wave absorption, and asymmetrical wavefront manipulation
Powell, Keith. "Next generation wavefront controller for the MMT adaptive optics system: Algorithms and techniques for mitigating dynamic wavefront aberrations." Diss., The University of Arizona, 2012. http://hdl.handle.net/10150/222838.
Full textMoshirfar, Majid, Tirth Shah, David Skanchy, Steven Linn, Paul Kang, and Daniel Durrie. "Comparison and analysis of FDA reported visual outcomes of the three latest platforms for LASIK: wavefront guided Visx iDesign, topography guided WaveLight Allegro Contoura, and topography guided Nidek EC-5000 CATz." DOVE MEDICAL PRESS LTD, 2017. http://hdl.handle.net/10150/622646.
Full textVarslot, 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.
Full textMedisinsk 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.
Roney, Caroline Helen. "Mathematical techniques for assessing cardiac wavefront dynamics." Thesis, Imperial College London, 2015. http://hdl.handle.net/10044/1/39976.
Full textOag, Thomas J. D. "Interferometric wavefront sensing for extreme adaptive optics." Thesis, Durham University, 2004. http://etheses.dur.ac.uk/3101/.
Full textAsh, Darren. "Optimal wavefront sensing for adaptive optics systems." Thesis, University of Kent, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.297368.
Full textLu, Jiahui. "Designing wavefront sensors from liquid crystal microlenses." Thesis, University of Cambridge, 2014. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.707989.
Full textTeich, M., J. Sturm, L. Büttner, and J. Czarske. "Distortion-free 3D imaging using wavefront shaping." SPIE, 2017. https://tud.qucosa.de/id/qucosa%3A34966.
Full textKhandekar, Rahul M. "Advanced wavefront manipulation technologies in optical systems." Diss., Online access via UMI:, 2008.
Find full textIncludes bibliographical references.
Korablinova, Nina. "Measuring corneal topography using wavefront analysis technique." [S.l. : s.n.], 2004. http://nbn-resolving.de/urn:nbn:de:bsz:16-opus-65645.
Full textChang, YuChun. "Diffraction wavefront analysis of computer-generated holograms." Diss., The University of Arizona, 1999. http://hdl.handle.net/10150/284879.
Full textZhu, Mingxia. "Microfluctuations of Wavefront Aberrations of the Eye." Thesis, Queensland University of Technology, 2005. https://eprints.qut.edu.au/16121/1/Mingxia_Zhu_Thesis.pdf.
Full textZhu, Mingxia. "Microfluctuations of Wavefront Aberrations of the Eye." Queensland University of Technology, 2005. http://eprints.qut.edu.au/16121/.
Full textBARTOLUCCI, FRANCESCA. "Radon transforms: Unitarization, Inversion and Wavefront sets." Doctoral thesis, Università degli studi di Genova, 2020. http://hdl.handle.net/11567/997903.
Full textLin, Menglan. "Functionality-multiplexing metasurfaces for electromagnetic wavefront manipulation." Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPAST052.
Full textFunctionality-multiplexing metasurfaces have attracted considerable attention as prominent candidates for coping with device integration and miniaturization. Such metasurfaces enable different functionalities to be achieved from a single device. To develop meta-devices in the microwave regime, some issues cannot be ignored. This PhD thesis is devoted to exploring different methodologies to realize functionality-multiplexing meta-devices, focusing on critical issues such as independent spin-state manipulation, wide operating bandwidth, independent controllability and real-time regulation. Numerical and experimental validation have been conducted for several applications of electromagnetic wave manipulation in each functionality-multiplexing meta-device. The work was done jointly by Université Paris-Saclay and Xidian University. First, a polarization-multiplexing passive meta-device is developed to achieve independent amplitude manipulation and dependent full-phase modulation for orthogonal circularly polarized states. Diverse vortex beam generators are then implemented for orthogonal spin-states in a wide frequency band and a spin-selective absorption at the resonance frequency is targeted. A mechanically re-organizable meta-device is also realized, where a dynamic phase modulation is achieved by plugging meta-atoms in an all-dielectric structure. The capability of this meta-device for wavefront manipulation is investigated through two functionalities in a wide frequency band, i.e., vortex beam generators with different topological charges and near-field holograms with tunable imaging patterns. Finally, an electronically reconfigurable metasurface, consisting of individually addressable meta-atom, is exploited for near-field focusing at different focal lengths based on the superoscillation mechanism. Additionally, one-dimensional and two-dimensional bottle beams are generated with different radii of circular trajectories
Costa, Joana Büchler. "Development of a new infrared pyramid wavefront sensor." [S.l. : s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=974121045.
Full textRicciardi, Sébastien. "Polymeric Microcavities for Dye Lasers and Wavefront Shapers." Licentiate thesis, KTH, Microelectronics and Applied Physics, MAP, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4655.
Full textOver the last few years, the available computing power allows us to have a deeper insight into photonics components than we ever had before. In this thesis we use the finite element method (FEM) to explore the behavior of the waves in 2D planar microcavities. We demonstrate the tunability of the cavity over a wide range of frequencies taking into account both the thermo-mechanical and the thermo-optical effect. Geometry and material choices are done so that the latter is predominant. We also demonstrate an odd mode disappearing phenomenon reported here for the first time as far as we know. Using this knowledge, we design two structures with these remarkable properties.
One of the devices will be used as micro-sized solid-state dye laser with Rhodamine 6G as the active medium and SU-8 polymer as a cavity material in sizes that have never been reached before. This opens new opportunities not only for future implementation for “labs-on-a-chip” (LOC) but also for a higher integration density of optical communication systems. The second device is a wavefront shaper creating plane waves from a point source performing the functions of beam shaper and beam splitter with plane wave as the output result.
After an introduction to FEM and comparison with a rival algorithm, some issues related to FEM in electromagnetic simulation are resolved and explained. Finally, some fabrication techniques with feature sizes <100 nm, such as electron beam lithography (EBL) and nano-imprint lithography (NIL), are described and compared with other lithographic techniques.
Clare, Richard M. "Wavefront sensing and phase retrieval for astronomical imaging." Thesis, University of Canterbury. Electrical and Computer Engineering, 2004. http://hdl.handle.net/10092/7841.
Full textZou, Weiyao. "OPTIMIZATION OF ZONAL WAVEFRONT ESTIMATION AND CURVATURE MEASUREMENTS." Doctoral diss., University of Central Florida, 2007. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4134.
Full textPh.D.
Optics and Photonics
Optics and Photonics
Optics PhD
Torti, Cristiano. "Curvature-based wavefront sensors for the human eye." Thesis, City University London, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.446340.
Full textGelman, Geoffrey M. (Geoffrey Michael) 1977. "Distance estimation through wavefront curvature in cellular systems." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/80537.
Full textIncludes bibliographical references (leaves 78-79).
by Geoffrey M. Gelman.
S.B.and M.Eng.
Frigerio, Federico Ph D. Massachusetts Institute of Technology. "3-dimensional surface imaging using Active Wavefront Sampling." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/38258.
Full textIncludes bibliographical references (p. 129-130).
A novel 3D surface imaging technique using Active Wavefront Sampling (AWS) is presented. In this technique, the optical wavefront traversing a lens is sampled at two or more off-axis locations and the resulting motion of each target feature is measured. This target feature image motion can be used to calculate the feature's distance to the camera. One advantage of this approach over traditional stereo techniques is that only one optical train and one sensor can be used to obtain depth information, thereby reducing the bulk and the potential cost of the equipment. AWS based systems are also flexible operationally in that the number of sampling positions can be increased or decreased to respectively raise the accuracy or to raise the processing speed of the system. Potential applications include general machine vision tasks, 3D endoscopy, and microscopy. The fundamental depth sensitivity of an AWS based system will be discussed, and practical implementations of the approach will be described. Algorithms developed to track target features in the images captured at different aperture sampling positions will be discussed, and a method for calibrating an AWS based method will also be described.
by Federico Frigerio.
Ph.D.
Brooks, Keira J., Laure Catala, Matthew A. Kenworthy, Steven M. Crawford, and Johanan L. Codona. "Polarization dOTF: on-sky focal plane wavefront sensing." SPIE-INT SOC OPTICAL ENGINEERING, 2016. http://hdl.handle.net/10150/622419.
Full textSala, Simone. "Wavefront and nanostructure characterisation with X-ray ptychography." Thesis, University College London (University of London), 2018. http://discovery.ucl.ac.uk/10057099/.
Full textXue, Jing. "Wavefront Healing and Tomographic Resolution of Mantle Plumes." Thesis, Virginia Tech, 2014. http://hdl.handle.net/10919/50423.
Full textMaster of Science
Glazar, Nikolaus. "Micropatterned Photoalignment for Wavefront Controlled Switchable Optical Devices." Kent State University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=kent1460650961.
Full textMurthy, Vinay. "Recovery from transient faults in wavefront processor arrays." Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-06302009-040356/.
Full textCai, Wenrui. "Wavefront Analysis and Calibration for Computer Generated Holograms." Diss., The University of Arizona, 2013. http://hdl.handle.net/10150/311214.
Full textLombini, Matteo <1977>. "Laser guide stars wavefront sensors for the EELT." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2011. http://amsdottorato.unibo.it/3706/1/Lombini_Matteo_tesi.pdf.
Full textLombini, Matteo <1977>. "Laser guide stars wavefront sensors for the EELT." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2011. http://amsdottorato.unibo.it/3706/.
Full textPatti, Mauro <1989>. "MAORY: wavefront sensor prototype and instrument optical design." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amsdottorato.unibo.it/8534/1/Mauro_Patti.pdf.
Full textOlivier, Nicolas. "Contrast Mechanisms & Wavefront Control in Coherent Nonlinear Microscopy." Phd thesis, Ecole Polytechnique X, 2009. http://pastel.archives-ouvertes.fr/pastel-00006255.
Full textMcGaughey, Donald. "Spectral modelling and simulation of atmospherically distorted wavefront data." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/NQ54425.pdf.
Full textAllen, Matthew R. "Wavefront control for space telescope applications using adaptive optics." Thesis, Monterey, Calif. : Naval Postgraduate School, 2007. http://bosun.nps.edu/uhtbin/hyperion-image.exe/07Dec%5FAllen%5FM.pdf.
Full textThesis Advisor(s): Agrawal, Brij. "December 2007." Description based on title screen as viewed on January 16, 2008. Includes bibliographical references (p. 89-90). Also available in print.
Brooks, Jonathan Mark. "A compact Shack-Hartmann wavefront sensor for the eye." Thesis, Imperial College London, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.416449.
Full textHe, Qubao. "Coherent power combining on spacecraft via wavefront Multiplexing techniques." Thesis, California State University, Long Beach, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=1527380.
Full textA novel orthogonal wavefront (WF) Multiplexing (Muxing) and De-Multiplexing (Demuxing) scheme is proposed for uplink from antenna array elements to multiple spacecraft (S/C). By using an adaptive equalization at the receiver of S/C, the phase deviation due to different near field distances of the uplink from antenna array elements to S/C is compensated via the WF Demuxing method on S/C. This scheme allows power combining from antenna array elements to S/C. Besides, this scheme can be extended and applied to multiple S/C. Simulations verify that the proposed scheme achieves the same bit error rate (BER) performance as the theoretical BER in additive white Gaussian noise (AWGN) channels and one path flat fading channel. Furthermore, although the radiated signals among the multiple radiating antenna array elements are non-coherent, the coherent power combining of the radiations of multiple radiating antenna array elements is accomplished on the S/C receiver in the proposed techniques.