Searched for: subject:"Adaptive%5C+Optics"
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Sinquin, B. (author)
The extremely large telescopes that should see first light in coming years demand so-called adaptive optics systems to overcome the devastating effect of the atmospheric turbulence on the image quality. A sensor measures the incoming distortion of the light and is used for reshaping the latter using a deformable mirror. Processing the large...
doctoral thesis 2019
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Brunner, A.E. (author)
In the coming decade, a new generation of extremely large-scale ground-based astronomical telescopes will see first light. It is well known that increasing the size of the telescope aperture is only beneficial if the adaptive optics (AO) system, which compensates for turbulence-induced wavefront aberrations, scales accordingly. For the extreme...
doctoral thesis 2018
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Wilding, D. (author)
The goal of this thesis, called Physical and Computational Approaches to Aberration Correction In Fluorescence Microscopy, concerns itself with the development of new techniques to control adaptive fluorescence microscopes, so that they can adapt and image with increased resolution, contrast and speed inside complex three-dimensional biological...
doctoral thesis 2018
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Quintavalla, M. (author), Pozzi, P. (author), Verhaegen, M.H.G. (author), Verstraete, H.R.G.W. (author), Bonora, S. (author)
Adaptive Optics (AO) has revealed as a very promising technique for high-resolution microscopy, where the presence of optical aberrations can easily compromise the image quality. Typical AO systems however, are almost impossible to implement on commercial microscopes. We propose a simple approach by using a Multi-actuator Adaptive Lens (MAL)...
conference paper 2018
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Wilding, D. (author), Pozzi, P. (author), Soloviev, O.A. (author), Vdovine, Gleb (author), Fiolka, Reto (author), Verhaegen, M.H.G. (author)
The light-sheet fluorescence microscopy is an excellent tool for the investigation of large three dimensional microscopy samples at the cellular level, however, the ability to resolve features is strongly affected by the presence of scattering and aberrations. These effects are two fold in light-sheet microscopy, as the illumination path...
conference paper 2018
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Pozzi, P. (author), Wilding, D. (author), Soloviev, O.A. (author), Vdovine, Gleb (author), Verhaegen, M.H.G. (author)
In this work, we present a new confocal laser scanning microscope capable to perform sensorless wavefront optimization in real time. The device is a parallelized laser scanning microscope in which the excitation light is structured in a lattice of spots by a spatial light modulator, while a deformable mirror provides aberration correction and...
conference paper 2018
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Wilding, D. (author), Pozzi, P. (author), Soloviev, O.A. (author), Vdovine, Gleb (author), Verhaegen, M.H.G. (author)
In life sciences, interest in the microscopic imaging of increasingly complex three dimensional samples, such as cell spheroids, zebrafish embryos, and in vivo applications in small animals, is growing quickly. Due to the increasing complexity of samples, more and more life scientists are considering the implementation of adaptive optics in...
conference paper 2018
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Verstraete, H.R.G.W. (author)
Optical coherence tomography (OCT) is a technique for non-invasive imaging based on low coherence interferometry. Its main application is found in ophthalmology, where it is used for 3D in vivo imaging of the cornea and the retina. OCT has evolved over the past decade as one of the most important ancillary tests in ophthalmic practice, providing...
doctoral thesis 2017
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Mocci, J. (author), Cua, M. (author), Lee, S (author), Jian, Y (author), Pozzi, P. (author), Quintavalla, M. (author), Trestino, C. (author), Verstraete, H.R.G.W. (author), Wahl, D. (author), Muradore, R. (author), Zawadzki, R.J. (author), Verhaegen, M.H.G. (author), Sarunic, M.V. (author), Bonora, S. (author)
The use of adaptive lenses instead of deformable mirrors can simplify the implementation of an adaptive optics system. The recently introduced Multi-actuator Adaptive Lens (MAL) can be used in closed loop with a wavefront sensor to correct for time-variant wavefront aberrations. The MAL can guarantee a level of correction and a response time...
conference paper 2017
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Li, X. (author), Wei, L. (author), Poelma, René H. (author), Vollebregt, S. (author), Wei, J. (author), Urbach, Paul (author), Sarro, P.M. (author), Zhang, G.Q. (author)
This paper presents a tuneable binary amplitude Fresnel lens produced by wafer-level microfabrication. The Fresnel lens is fabricated by encapsulating lithographically defined vertically aligned carbon nanotube (CNT) bundles inside a polydimethyl-siloxane (PDMS) layer. The composite lens material combines the excellent optical absorption...
journal article 2016
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Wilding, D. (author), Pozzi, P. (author), Soloviev, O.A. (author), Vdovine, Gleb (author), Verhaegen, M.H.G. (author)
Aberrations, scattering and absorption degrade the performance light-sheet fluorescence microscopes (LSFM). An adaptive optics system to correct for these artefacts and to optimize the light-sheet illumination is presented. This system allows a higher axial resolution to be recovered over the field-of-view of the detection objective. It is...
conference paper 2016
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Verstraete, H.R.G.W. (author), Almasian, M. (author), Pozzi, P. (author), Bilderbeek, R (author), Kalkman, J. (author), Faber, DJ (author), Verhaegen, M.H.G. (author)
In this manuscript, we present a lens setup for large defocus and astigmatism correction. A deformable defocus lens and two rotational cylindrical lenses are used to control the defocus and astigmatism. The setup is calibrated using a simple model that allows the calculation of the lens inputs so that a desired defocus and astigmatism are...
conference paper 2016
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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
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Gong, H. (author), Pozzi, P. (author), Soloviev, O.A. (author), Verhaegen, M.H.G. (author), Vdovine, Gleb (author)
We present a reference-less and time-multiplexing phase retrieval method by making use of the digital micromirror device (DMD). In this method, the DMD functions not only as a flexible binary mask which modulates the optical field, but also as a sampling mask for measuring corresponding phases, which makes the whole setup simple and robust. The...
conference paper 2016
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Yoo, H.W. (author), van Royen, M.E. (author), van Cappellen, WA (author), Houtsmuller, AB (author), Verhaegen, M.H.G. (author), Schitter, G (author)
The pinhole plays an important role in confocal laser scanning microscopy (CLSM) for adaptive optics (AO) as well as in imaging, where the size of the pinhole denotes a trade-off between out-of-focus rejection and wavefront distortion. This contribution proposes an AO system for a commercial CLSM with an adjustable square pinhole to cope with...
conference paper 2016
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Agbana, T.E. (author), Yang, H. (author), Soloviev, O.A. (author), Vdovine, Gleb (author), Verhaegen, M.H.G. (author)
This paper presents experimental results of a static aberration control algorithm based on the linear relation be- tween mean square of the aberration gradient and the second moment of point spread function for the generation of control signal input for a deformable mirror (DM). Results presented in the work of Yang et al.1 suggested a good...
conference paper 2016
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Yoo, H.W. (author)
Confocal laser scanning microscopy (CLSM) is considered as one of the major advancements in microscopy in the last century and is widely accepted as a 3D fluorescence imaging tool for biological studies. For the emerging biological questions CLSM requires fast imaging to detect rapid biological processes and aberration-corrected imaging to...
doctoral thesis 2015
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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
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Vdovine, Gleb (author), Gong, H. (author), Soloviev, O.A. (author), Pozzi, P. (author), Verhaegen, M.H.G. (author)
We have experimentally demonstrated a lensless coherent microscope based on direct registration of the complex optical field by sampling the pupil with a sequence of two-point interferometers formed by a digital micromirror device. Complete registration of the complex amplitude in the pupil of the imaging system, without any reference beam,...
journal article 2015
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Soloviev, O.A. (author), Verhaegen, M.H.G. (author), Vdovine, 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
Searched for: subject:"Adaptive%5C+Optics"
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