Results 51 to 60 of about 712,952 (286)
Suppressing low-order eigenmodes with local control for deformable mirrors [PDF]
, 2012 To improve the mechanical characteristics of actively controlled continuous faceplate deformable mirrors in adaptive optics, a strategy for reducing crosstalk between adjacent actuators and for suppressing low-order eigenmodes is proposed.
Andersen, Torben +4 more
core +1 more source
Terahertz adaptive optics with a deformable mirror [PDF]
Optics Letters, 2018 We report on the wavefront correction of a terahertz (THz) beam using adaptive optics, which requires both a wavefront sensor that is able to sense the optical aberrations, as well as a wavefront corrector. The wavefront sensor relies on a direct 2D electro-optic imaging system composed of a ZnTe crystal and a CMOS camera.
Brossard, Mathilde +3 more
openaire +6 more sources
A Lorentz Force Actuated Continuous Deformable Polymer Mirror for Wavefront Control
Proceedings, 2017 This paper describes MEMS deformable polymer mirror system for adaptive optics application. This system employs a 4 µm thick SU-8 membrane with a stress balanced double side aluminum coating as a mirror element.
Byoungyoul Park +2 more
doaj +1 more source
Recent Developments in (0,2) Mirror Symmetry [PDF]
SIGMA 8 (2012), 068, 28 pages, 2012 Mirror symmetry of the type II string has a beautiful generalization to the heterotic string. This generalization, known as (0,2) mirror symmetry, is a field still largely in its infancy. We describe recent developments including the ideas behind quantum sheaf cohomology, the mirror map for deformations of (2,2) mirrors, the construction of mirror ...
arxiv +1 more source
Active Optics in Astronomy: Freeform Mirror for the MESSIER Telescope Proposal
Mathematical and Computational Applications, 2018 Active optics techniques in astronomy provide high imaging quality. This paper is dedicated to highly deformable active optics that can generate non-axisymmetric aspheric surfaces—or freeform surfaces—by use of a minimum number of actuators ...
Gerard Rene Lemaitre +2 more
doaj +1 more source
A Mirror Theorem for the Mirror Quintic [PDF]
Geom. Topol. 18 (2014) 1437-1483, 2012 The celebrated Mirror Theorem states that the genus zero part of the A model (quantum cohomology, rational curves counting) of the Fermat quintic threefold is equivalent to the B model (complex deformation, variation of Hodge structure) of its mirror dual orbifold. In this article, we establish a mirror-dual statement.
arxiv +1 more source
Ultrafast laser stress figuring for accurate deformation of thin mirrors [PDF]
, 2022 Fabricating freeform mirrors relies on accurate optical figuring processes capable of arbitrarily modifying low-spatial frequency height without creating higher-spatial frequency errors. We present a scalable process to accurately figure thin mirrors using stress generated by a focused ultrafast laser.
arxiv +1 more source
A Design Study on Adaptive Primaries for 1-2 Meter Class Telescopes [PDF]
arXiv, 2021 Adaptive optics (AO) offers an opportunity to stabilize an image and maximize the spatial resolution achievable by ground based telescopes by removing the distortions due to the atmosphere. Typically, the deformable mirror in an AO system is integrated into the optical path between the secondary mirror and science instrument; in some cases, the ...
arxiv
Micromachines, 2023 A common problem in deformable mirror assembly is that the adhesion of actuators to an optical mirror face sheet introduces unwanted topography due to large local stresses generated at the adhesive joint.
Wenkuan Man, Thomas G. Bifano
doaj +1 more source
Deformable Mirrors developments at ESO [PDF]
, 2015 Already several deformable mirrors are in use at Paranal and more will come in the next years. With the next generation and telescope and associated instruments, adaptive optics become an integrated part of the telescope and provide as such the first layer of image correction.
Vernet, Elise, Stroebele, Sefan
openaire +2 more sources