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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
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Maddalena, L. (author)Optogenetics is a powerful addition to the spectrum of techniques available in neuroscience to investigate neurophysiology and unravel how neural circuit structure is related to circuit function. This technique relies on introducing lightsensitive proteins or molecules as actuators to transduce an optical signal into a physiological perturbation...doctoral thesis 2022
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Hung, S. (author), Llobet Rosell, Arnau (author), Jurriens, Daphne (author), Soloviev, O.A. (author), Kapitein, Lukas C. (author), Grußmayer, K.S. (author), Neukomm, Lukas J. (author), Verhaegen, M.H.G. (author), Smith, C.S. (author)Single-molecule localization microscopy (SMLM) enables the high-resolution visualization of organelle structures and the precise localization of individual proteins. However, the expected resolution is not achieved in tissue as the imaging conditions deteriorate. Sample-induced aberrations distort the point spread function (PSF), and high...journal article 2022
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Navikas, Vytautas (author), Descloux, Adrien C. (author), Grußmayer, K.S. (author), Marion, Sanjin (author), Radenovic, Aleksandra (author)A variety of modern super-resolution microscopy methods provide researchers with previously inconceivable biological sample imaging opportunities at a molecular resolution. All of these techniques excel at imaging samples that are close to the coverslip, however imaging at large depths remains a challenge due to aberrations caused by the...journal article 2021
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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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Gupta, Abhimanyu (author)The use of radial basis function (RBF) expansion as a means to represent the generalized pupil function for aberration retrieval from intensity point-spread function has been investigated in this research article. The optimal choice of RBF hyper-parameters is derived empirically to achieve an increased accuracy of approximation along with well...master thesis 2017
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Varnai, Peter (author)We study the important mathematical problem of approximating the inverse of low Kronecker-rank matrices in this same form. A traditional alternating least squares (ALS) scheme for solving such problems is presented, and we discuss two efficient solutions to the subproblems arising in the corresponding iterations. The first relies on a least...master thesis 2017
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Çağlayan, Fatihhan (author)Recently, with the switch to the new generation adaptive optics systems like the VLT and ELT an important identification problem emerged. These telescopes are so-called integrated systems, which means that open-loop calibration of the interaction matrix is not possible anymore. The first and foremost reason for this is that the new generation of...master thesis 2017
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Bucsa, R.E. (author)In the DCSC group of Prof. Michel Verhaegen a new type of fluorescence microscope has been developed that relies on adaptive optics to correct for aberrations using optimisation of an image metric. The aim of this thesis is to realise a complete simulation of the optical system, and to test a variety of optimisation algorithms in simulation,...master thesis 2016
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Gong, H. (author), Pozzi, P. (author), Soloviev, O.A. (author), Verhaegen, M.H.G. (author), Vdovin, 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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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
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Kant, N. (author)In this thesis a model-based filter is developed to improve the estimates of the lens aberrations.master thesis 2015
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Mulder, Y.T.B. (author), Romijn, J. (author), Verhaert, D.S.M. (author)In this project, a USB DAC was designed. This was done according to a proposal from Flexible Optical B.V. which is located in Rijswijk. This device is used to correct for atmospheric interference in optical measurement systems. The existing DAC is ten years old and needs to be updated to requirements of today. The 'next generation' DAC has been...bachelor thesis 2015
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Van Dam, L. (author), Van Dijk, S.A. (author), Van der Kaay, M.S. (author)A High-Speed Digital-to-Analog converter system is proposed that is controlled using USB 3.0. Possibilities to improve the refresh rate and resolution are researched to meet the standards of modern measurement systems. For instance, adaptive optics often uses a DAC in its feedback loop, but the USB DAC systems currently available provide...bachelor 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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Polo, A. (author)In the semiconductor industry, optical lithography is presently the most widespread technology used to print a geometrical pattern on a semiconductor wafer. Because of the plans imposed by the International Technology Roadmap for Semiconductors (ITRS) for more powerful and smaller chips, new printing technologies capable of printing smaller...doctoral thesis 2014
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Saathof, R. (author)In highly precise systems the thermal expansion of system-parts is of increasing concern, since it can severely compromise its performance at sub-nanometre level. An example of such a system is an Extreme UltraViolet (EUV)-lithography machine that is used in the semi-conductor industry to project the pattern of the chip onto a silicon wafer. In...doctoral thesis 2013
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Tesch, J. (author), Gibson, S. (author), Verhaegen, M. (author)A new method for adaptive prediction and correction of wavefront errors in adaptive optics (AO) is introduced. The new method is based on receding-horizon control design and an adaptive lattice filter. Experimental results presented illustrate the capability of the new adaptive controller to predict and correct aero-optical wavefronts derived...journal article 2013
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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
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