Searched for: subject%3A%22deformable%255C+mirror%22
(1 - 20 of 25)

Pages

List view
Grid view
document
Shen, Dong (author)
Deformable Mirror (DM) is the key part in the AO system. Characterization of DM is important as it maps between input voltage signal and output mirror deformation. The precision of characterization largely affects the control performance. While characterizing the DM with wavefront sensors is easy and straightforward, there is very few research...
master thesis 2023
document
Broekens, K.A. (author), Klop, Wimar (author), Moens, Thijs (author), Eschen, M. (author), Castro do Amaral, G. (author), Silverstri, Fabrizio (author), Visser, Martijn (author), Kaffa, Lauren (author), Saathof, R. (author)
For the next generation of very high throughput communication satellites, free-space optical (FSO) communication between ground stations and geostationary telecommunication satellites is a potential solution to overcome the limitations of RF links. To mitigate atmospheric turbulence effects, TNO proposes Adaptive Optics (AO) to apply uplink...
conference paper 2023
document
van Genderen, Rick (author)
In the field of Adaptive Optics (AO) a new development has been introduced recently: the Wavefront Sensorless Adaptive Optics (WFSless AO) approach, which only uses camera measurements to optimize image quality and does not use a Shack-Hartman (SH) Wavefront Sensor (WFS) [Booth, 2006, Débarre et al., 2009, Hinnen et al., 2008]. In order to...
master thesis 2021
document
van Marrewijk, Gijsbert (author)
Launch costs for high-resolution space telescopes for Earth observation can be reduced when the telescope mirrors are made deployable. However, such a system is subject to optical aberrations that decreases image quality. To counter these aberrations, an Aberration Correction System (ACS) is proposed that uses a deformable mirror (DM) which is...
master thesis 2018
document
Rozene Vallespín, Alejandro (author)
The resolution of ground-based telescopes is limited by the blurring caused by Earth’s turbulent atmosphere. Adaptive Optics (AO) is a technique used to correct atmospheric distortions, restoring images to diffraction-limited resolution. The main element of an AO system is the Deformable Mirror (DM), which compensates the distortions of the...
master thesis 2018
document
Habets, Michel (author), Scholten, Joni (author), Weiland, Siep (author), Coene, W.M.J.M. (author)
The imaging quality of the projection optics of an extreme ultraviolet lithography scanner degrades under the influence of thermally induced deformations of its mirrors. Wavefronts of different reticle points encounter different parts of the deformed mirrors, resulting in a field dependent wavefront error. This paper presents how ideas from...
conference paper 2016
document
Theulings, E.C.A.S. (author)
Deformable mirrors are widely used in adaptive optics to correct wavefront aberrations. Actuators are used to deform the mirror into the shape that is needed for this correction. The most common type of actuation is with out-of-plane actuators that are placed on the backside of the mirror surface. Actuation with in-plane actuators placed on the...
master thesis 2015
document
Agbana, T.E. (author), Soloviev, O. (author), Bezzubik, V. (author), Patlan, V. (author), Verhaegen, M. (author), Vdovin, G.V. (author)
We have implemented an extended depth of field optical system by wavefront coding with a micromachined membrane deformable mirror. This approach provides a versatile extension to standard wavefront coding based on fixed phase mask. First experimental results validate the feasibility of the use of adaptive optics for variable depth wavefront...
conference paper 2015
document
Soloviev, O.A. (author), Verhaegen, M.H.G. (author), Vdovin, Gleb (author)
Shack-Hartmann (SH) sensor, based on sampling of wavefront tilts in subapertures, is a simple, reliable, and widely used in adaptive optics wavefront sensor. A wavefront curvature sensor has the advantage of providing the results suitable for direct control of membrane and bimorph deformable mirrors [1], but requires linear registration of...
conference paper 2015
document
Ten Have, E.S. (author)
This thesis investigates a novel deformable mirror that works on the basis of the electrostatic deformation of a liquid surface. The liquid mirror allows large surface displacements, a large number of actuators, and the modification of its properties, while at the same time the mirror design is simple and may be realized without sophisticated...
doctoral thesis 2014
document
Ursum, L.J. (author)
The semiconductor industry is on an ongoing quest to realize smaller feature size, requiring the constant implementation of new technology. A possible new technology is the use of a spatially controlled heat source to actively deform a mirror substrate to compensate for wavefront aberrations. In order to validate the ability to generate...
master thesis 2013
document
Ellenbroek, R.M.L. (author)
The refractive index of air varies a.o. with temperature, humidity, pressure and the CO2 concentration. Due to atmospheric turbulence this refractive index varies both in space and in time, leading to aberrations in images of light having passed though it. These aberrations limit the achievable resolution of optical telescopes such that the...
doctoral thesis 2011
document
Schutten, G.J.M. (author)
master thesis 2011
document
Ten Have, E.S. (author), Vdovin, G. (author)
Closed-loop adaptive optical correction using a deformable mirror based on the total internal reflection (TIR) from an electrostatically deformed liquid-air interface was performed on a collimated beam of a HeNe-laser that was aberrated by a rotating phase disk. The frequency response of the system was measured and the influence of liquid...
conference paper 2011
document
Loktev, M. (author), Vdovin, G. (author), Soloviev, O. (author)
We describe a compact integrated module implementing a low-cost adaptive optics system. It is targeted as a correction system for small telescopes with primary mirror diameter up to 1 m, operating on a natural guide star with magnitude at least 4 (for a 25 cm telescope). It is supposed to provide stable diffraction-limited imaging of stars,...
conference paper 2008
document
Hamelinck, R. (author), Ellenbroek, R. (author), Rosielle, N. (author), Steinbuch, M. (author), Verhaegen, M. (author), Doelman, N. (author)
A new prototype adaptive deformable mirror for future AO-systems is presented that consists of a thin continuous membrane on which push-pull actuators impose out-of-plane displacements. Each actuator has ±10?m stroke, nanometer resolution and only mW’s heat dissipation. The mirror’s modular design makes the mechanics, electronics and control...
conference paper 2008
document
Vuelban, E.M. (author)
Abstract not available
doctoral thesis 2006
document
Vuelban, E.M. (author), Bhattacharya, N. (author), Braat, J.M. (author)
Recently, a new type of liquid based deformable mirror has been proposed and demonstrated. The device consists of an array of vertically oriented open capillary channels immersed in a pool of two immiscible liquids and a freefloating reflective membrane, which serves as the reflecting surface. Liquid surface and membrane deformations are...
conference paper 2006
document
Simonov, A.N. (author), Hong, S., (author), Vdovin, G. (author)
journal article 2006
document
Song, H. (author), Simonov, A.N. (author), Vdovin, G. (author)
Addressing of massive arrays of piezoelectric actuators is usually achieved by using separate high-voltage output drivers, one per channel. This approach applied to high-order adaptive optics systems results in complex, expensive and vulnerable to handling abuse driver electronics, hardly scalable to 103-104 actuators. To reduce the number of...
conference paper 2005
Searched for: subject%3A%22deformable%255C+mirror%22
(1 - 20 of 25)

Pages

List view
Grid view