Results 231 to 240 of about 30,667 (264)
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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 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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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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Surface solution to correct a freeform wavefront
Applied Optics, 2021In this paper an equation is presented to design a refractive surface such that, given an arbitrary wavefront, the surface refracts it into a perfect spherical wave. The equation that computes these refractive surfaces is exhaustively tested using ray-tracing techniques, and the performance is as expected.
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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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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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High-speed Holographic Wavefront Correction
Imaging and Applied Optics 2016, 2016We present details of a compact, holographic adaptive optics system with 64 actuators and 100kHz bandwidth, but no computer. We are currently modifying our system with a view towards an on-sky test in a large astronomical telescope in late-2016.
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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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Monolithic piezoelectric mirror for wavefront correction
Applied Physics Letters, 1974Experimental and theoretical analysis show that a spatially varying potential applied to one surface of a thick block of piezoelectric material will induce a piezoelectric deformation of that surface proportional to the potential at each point of the surface.
J. Feinleib, S. G. Lipson, P. F. Cone
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Wavefront correction inside unbalanced nulling interferometer
SPIE Proceedings, 2012In an unbalanced nulling interferometer (UNI) of our coronagraph system, the incidence light is divided into two, and they interfere by a reverse phase with different amplitude. Thereby, phase errors are magnified and we can correct a wavefront with higher precision.
Masaaki Horie +9 more
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