- document
-
Tacx, Paul (author), Habraken, Roel (author), Witvoet, Gert (author), Heertjes, Marcel (author), Oomen, T.A.E. (author)Next-generation deformable mirrors are envisaged to exhibit low-frequency flexible dynamics and to contain a large number of spatially distributed actuators due to increasingly stringent performance requirements. The increasingly complex system characteristics necessitate identifying the flexible dynamic behavior for design validation and...journal article 2024
- document
-
Maroquin, Serena (author)IAC will be developing a new Transportable Optical Ground Station (TOGS). It is a telescope that is intended to be used for quantum key distribution in a number of events. Using AO for free-space propagation stabilises the optical signal on a detector significantly, and maximises the received signal by returning near-diffraction limited...master thesis 2023
- 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
-
Maddalena, L. (author), Pozzi, Paolo (author), Ceffa, Nicolò G. (author), Hoeven, Bas van der (author), Carroll, E.C.M. (author)Light-sheet microscopy is a powerful method for imaging small translucent samples in vivo, owing to its unique combination of fast imaging speeds, large field of view, and low phototoxicity. This chapter briefly reviews state-of-the-art technology for variations of light-sheet microscopy. We review recent examples of optogenetics in...book chapter 2023
- document
-
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
- document
-
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
- 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
-
de Bruijne, Bas (author)Ground based telescope imaging suffers from interference from the earth’s atmosphere. Fluctuations in the refractive index of the air delay incoming light randomly, resulting in blurred images. A deconvolution from wavefront sensing system is an adaptive optics system that measures the modes in which the light is corrupted (i.e. the wavefront)...master thesis 2021
- document
-
Stouten, Simon (author)Turbulent layers high in the atmosphere cause anisoplanatic phase aberrations, that are responsible for image degradation [6, 33, 46]. Adaptive Optics (AO) aims to correct for these aberrations by sensing them with a wavefront sensor and performing the correction with phase conjugate devices [18]. Various wavefront sensors have been designed and...master thesis 2021
- document
-
Kazasidis, O. (author)Fast adaptive optics and comparatively slower active optics are cornerstones of modern-day astronomy. Such systems are installed on most current large ground-based observatories in the visible or infrared and are included in the design of all future observatories. Their role is twofold; first, to compensate for astronomical seeing, and second,...doctoral thesis 2021
- document
-
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
- document
-
Bekendam, Matthijs (author)The Delft Center for Systems and Control (DCSC) 'Smart Optics' aim to achieve higher resolution imaging through Adaptive Optics (AO). Adaptive optics is a modern technique for detecting and correcting real-time wavefront aberrations and is widely used in biomedical imaging and astronomical imaging. Wavefront sensing lies at the core of Adaptive...master thesis 2020
- document
-
Colaço Baptista Cerqueira, Paulo (author)The visualization of objects within or beyond a turbulent medium is hampered by the aberrations the medium induces in the wavefront. The sharpness of an image is maximal when the incoming wavefront is flat, with aberrated wavefronts yielding distorted images of limited utility. In the particular case of astronomy, the flat wavefront of the light...master thesis 2020
- document
-
Piscaer, P.J. (author), Soloviev, O.A. (author), Verhaegen, M.H.G. (author)This paper discusses various practical problems arising in the design and simulation of predictive control methods for adaptive optics. Although there has been increased attention towards optimal prediction and control methods for AO systems, they are often tested in simplified simulation environments. The use of advanced AO simulators...conference paper 2020
- document
-
Gong, H. (author)This dissertation has mainly aimed at developing novel techniques, methodologies for measuring the optical field, specifically both the amplitude and phase distribution. Furthermore, we have attempted to extend their applications in the scope of optical imaging, including lensless/holographic imaging, quantitative phase imaging and the...doctoral thesis 2019
- document
-
Gedon, Daniel (author)For large-scale system with tens of thousands of states and outputs the computation in the conventional Kalman filter becomes time-consuming such that Kalman filtering in large-scale real-time application is practically infeasible. A possible mathematical framework to lift the curse of dimensionality is to lift the problem in higher dimensions...master thesis 2019
- document
-
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
- document
-
Stuik, Remko (author), Arcier, Benjamin (author), Brandl, B.R. (author)METIS, the Mid-IR instrument for the ELT will be operating an internal Single Conjugate Adaptive Optics System (SCAO), which will be the work horse AO system and mainly serve the science cases targeting exoplanets and disks around bright stars. In order to extend the sky coverage and brightness range of targets requiring AO correction to...conference paper 2019
- document
-
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