Results 181 to 190 of about 5,982 (227)
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Wavefront correction with photon echoes
Optics Communications, 1977Abstract If a first pulse with accumulated phase ϕ( x , y , z 0 ) and a plane wave second pulse generate a photon echo, the echo has phase -ϕ( x , y , z 0 ) and is wavefront corrected when returned along the path of the first pulse.
C.V. Heer, P.F. McManamon
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Wavefront correction based on a reflective liquid crystal wavefront sensor
Journal of Optics A: Pure and Applied Optics, 2008A novel wavefront sensor (WFS) based on liquid crystal on silicon (LCOS) is demonstrated. The design of the liquid crystal microlens array with LCOS is given in detail. To save the energy of the incident light, an optimized optical design of the WFS is also considered.
L Hu +7 more
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Wavefront shaping for intraocular scattering correction
OSA Imaging and Applied Optics Congress 2021 (3D, COSI, DH, ISA, pcAOP), 2021In this work we propose a non-invasive alternative to cataracts surgery by means of manipulating the wavefront of the incident light. We show a two-fold improvement in the Strehl ratio of the ocular Point Spread Function.
Alba Maria Paniagua-Diaz, Pablo Artal
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Wavefront correcting properties of corner-cube arrays
Applied Optics, 1988The performance of corner-cube arrays as pseudophase-conjugation wavefront correctors is investigated theoretically and experimentally. Hollow electroformed arrays and solid plastic arrays of corner-cube retroreflectors have been optically characterized and studied in a pseudophase-conjugate imaging system.
R A, Chipman +3 more
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A discussion of two wavefront aberration correction procedures
Ultrasonic Imaging, 1992This review paper discusses the basic properties of two adaptive signal processing procedures for dealing with weak scattering in a phased array transducer system. A fundamental improvement in the lateral resolution of ultrasonic echo scanners will result if the weight vector of a large phased array transducer can be modified to account for distortion ...
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Liquid crystal lens with corrected wavefront asymmetry
Applied Optics, 2018We propose a simple technique allowing the correction of the inherent wavefront asymmetry in electrically variable liquid crystal lenses with relatively small diameters. This is achieved by splitting the peripheral hole patterned electrode of the lens in the direction of the ground-state anisotropy axis.
Louis, Begel, Tigran, Galstian
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Aperture size effect on ultrasonic wavefront distortion correction
IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 2004The influences of aperture size on wavefront distortion correction are investigated both theoretically and numerically. A multilayer, phase-screen model is assumed to be the underlying, distorting medium. Numerical simulations were performed using three wavefront distortion correction methods: time-shift compensation (TSC), backpropagation followed by ...
Deng-Huei, Huang, Jenho, Tsao
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Fundamentals of Ocular Wavefront Correction
2009For vision correction, the key is to help patients achieve good visual performance. In most cases, this means good visual acuity and good contrast sensitivity. The ocular aberrations can be considered as a combination of the spherocylindrical aberrations and irregular aberrations.
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[The practicality of wavefront correction in ophthalmology].
Klinische Monatsblatter fur Augenheilkunde, 2004"Wavefront correction" has become an often used concept in refractive surgery, even though it is not always uniquely defined. Clinical results, however, are lagging behind the original expectations.The physical items wavefront error, light ray, ray tracing and refraction error first have to be well defined, including demonstration of the applicability ...
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