Results 101 to 110 of about 3,571 (136)
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Holography-based wavefront sensing
Applied Optics, 2007We describe a modal wavefront sensing technique of using multiplexed holographic optical elements (HOEs). The phase pattern of a set of aberrations is angle multiplexed in a HOE, and the correlated information is obtained with a position sensing detector.
F, Ghebremichael +2 more
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Making sense out of wavefront sensing
American Journal of Ophthalmology, 2005a T p HE PRESENCE OF OPTICAL ABERRATIONS THAT BLUR retinal images were the subject of popular lectures by Helmholtz in the 1860s, and led him to state: Now, it is not too much to say that if an optician wanted o sell me an instrument which had all these defects, I hould think myself justified in blaming his carelessness in he strongest terms and giving
Jay S, Pepose, Raymond A, Applegate
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Comparison of wavefront sensing devices
Ophthalmology Clinics of North America, 2004Wavefront measurement is an emerging technology that can evaluate low-order and high-order aberrations. This review compiles the different wavefront sensing devices and compares the most popular Hartmann-Shack aberrometers.
Kerry D, Solomon +3 more
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Wavefront sensing with an axicon
Optics Letters, 2011The use of a large apex-angle axicon for common-path interferometric wavefront sensing is proposed. The approach is a variant of point-diffraction interferometry bearing similarities to pyramidal wavefront sensing. A theoretical basis for wavefront sensing with an axicon is developed, and the outcomes of numerical simulations are compared to ...
Brian, Vohnsen +2 more
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A reference wavefront for wavefront sensing instruments
Workshop on Optical Fabrication and Testing, 1986A reference light source (RLS) was designed to allow the measurement and removal of system wavefront errors in wavefront sensing instruments. The wavefront of the RLS is produced by collimating and re-focussing the output of a laser diode onto a 1 micron pinhole aperture.
Lars A. Selberg, Bruce E. Truax
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The optics of wavefront sensing
Ophthalmology Clinics of North America, 2004This article reviews the fundamental principles by which wavefront aberrometers measure ocular aberrations. Three different ways of interpreting aberration measurements are described in terms of wavefront phase, slope, and curvature. Although curvature is the more familiar concept from geometrical optics, the wave optics concept of wavefront phase is ...
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Synthetic aperture wavefront sensing
Optical Engineering, 2013We propose the synthetic aperture wavefront sensing approach. It is based on acquiring several sets of measurements of the wavefront slopes by displacing sequentially the microlens array with respect to the unknown wavefront. These measurements are stacked together and processed as if obtained with a single-sampling array with an effective number of ...
Salvador Bará +2 more
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Prism configurations for wavefront sensing
Applied Optics, 1990This Technical Note mentions two prism configurations for wavefront sensing, both stimulated by works of Roddier. One implements an interferometric pupil-plane sensor, the other a noninterferometric wavefront curvature sensor.
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Gemini Wavefront Sensing Subsystems
SPIE Proceedings, 2003The Acquisition and Guiding Unit of the Gemini Telescope is able to support two major signal-processing functions: off axis active optics correction, and off axis fast guiding and focus. Both functions are performed by using up to two different Shack-Hartmann wavefront sensors working in the visible (called the Peripheral Wavefront Sensors).
Corinne Boyer +4 more
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SPIE Proceedings, 2009
As a wavefront sensing (WFS) tool, Baseline algorithm, which is classified as the iterative-transform algorithm of phase retrieval, estimates the phase distribution at pupil from some known PSFs at defocus planes. By using multiple phase diversities and appropriate phase unwrapping methods, this algorithm can accomplish reliable unique solution and ...
Heng Mao, Xiao Wang, Dazun Zhao
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As a wavefront sensing (WFS) tool, Baseline algorithm, which is classified as the iterative-transform algorithm of phase retrieval, estimates the phase distribution at pupil from some known PSFs at defocus planes. By using multiple phase diversities and appropriate phase unwrapping methods, this algorithm can accomplish reliable unique solution and ...
Heng Mao, Xiao Wang, Dazun Zhao
openaire +1 more source