Results 21 to 30 of about 3,491,013 (300)

Active 3D Diffractive Optics [PDF]

, 2019
Diffractive optics have increasingly captured the attention of the scientific community. Classical diffractive optics are 2D diffractive optical elements (DOEs) and computer-generated holograms (CGHs), which modulate optical waves on a solitary ...
Wang, Haiyan
core   +8 more sources

Active optics system of the VLT Survey Telescope [PDF]

, 2016
This paper describes the active optics system of the VLT Survey Telescope, the 2.6-m survey telescope designed for visible wavelengths of the European Southern Observatory at Cerro Paranal, in the Atacama desert.
Demetrio Magrin, Ragazzoni, R., Savarese, Salvatore, Marty, L., Umbriaco, Gabriele, Kuijken, Konrad, Rakich, Andrew, Ronald Holzlöhner, Andrew Rakich, Savarese, S., Dall'Ora, M., Sergio D’Orsi, Magrin, D., Massimo Capaccioli, Molfese, C., Laurent Marty, Davide Fierro, Dall'Ora, Massimo, Roberto Ragazzoni, Arcidiacono, C., Francesco Perrotta, Konrad Kuijken, Pietro Schipani, Rakich, A., Massimo Dall’Ora, Jacopo Farinato, Molfese, Cesare, Argomedo, J, Arcidiacono, Carmelo, Kuijken, K.H., Magrin, Demetrio, Ragazzoni, Roberto, Farinato, Jacopo, Cesare Molfese, Perrotta, Francesco, Salvatore Savarese, Fierro, Davide, Argomedo, Javier, Gabriele Umbriaco, Fierro, D., Javier Argomedo, Marty, Laurent, Lothar Noethe, Capaccioli, M., Holzlöhner, Ronald, Schipani, Pietro, Noethe, Lothar, Umbriaco, G., Schipani, P., D'orsi, Sergio, Noethe, L., D'Orsi, S, Holzlöhner, R., Farinato, J., CAPACCIOLI, MASSIMO, Perrotta, F., Carmelo Arcidiacono   +56 more
core   +2 more sources

Active support with set-and-forget characteristics for reflective optics

, 2022
Paper 1056232, 5 S.An active support for large reflective optics is suitable to compensate for manufacturing-induced deformations and (re-)positioning-induced deformations such as induced by slewing of earth-based ...
Goy, M., Reinlein, C., Mohaupt, M., Damm, C., Brady, A., Kamm, A.   +5 more
core   +1 more source

Development of a prototype active optics system for future space telescopes

, 2022
S.E101-E106It is envisaged that future large space telescopes will be lightweight and employ active optics to maintain optical quality throughout the mission lifetime.
Devaney, N., Goy, M., Kenny, F., Reinlein, C., Goncharov, A.V.   +4 more
core   +1 more source

Extending Capture Range for Piston Error in Segmented Primary Mirror Telescopes Based on Wavelet Support Vector Machine With Improved Particle Swarm Optimization

IEEE Access, 2020
In the co-phasing techniques applied to the segmented telescope, a Shack-Hartmann wavefront sensor cannot accurately detect the piston error of the segment. Although the phase diversity (PD) algorithm can detect the piston error of each segment, it fails
Haifeng Cao, Jingxu Zhang, Fei Yang, Qichang An, Ye Wang   +4 more
doaj   +1 more source

Coarse Phasing Detection Using Multiwavelength Wavefront

Photonics, 2023
Presently, the segmented mirror is the mainstream development direction of large-aperture telescopes. The key problem affecting the performance of segmented mirror telescopes concerns the co-phase of the segments. The segments’ co-phase includes the fine
Rongjie Qin, Zihao Yin, Yinnian Liu
doaj   +1 more source

Anamorphic zoom system based on liquid crystal displays [PDF]

Journal of the European Optical Society-Rapid Publications, 2009
In this work we present an anamorphic zoom system, based on liquid crystal displays, which allows changing the magnification and distortion of an image very quickly, without mechanical parts and keeping the output plane stationary.
Iemmi Claudio, Campos Juan
doaj   +1 more source

Active flux schemes on moving meshes with applications to geometric optics [PDF]

, 2018
Active flux schemes are finite volume schemes that keep track of both point values and averages. The point values are updated using a semi-Lagrangian step, making active flux schemes highly suitable for geometric optics problems on phase space, i.e., to ...
Lith, BS Bart van, IJzerman, WL Wilbert, ten Thije Boonkkamp, Jan, ten Thije Boonkkamp, Jan H.M., ten Thije Boonkkamp, J.H.M., IJzerman, Wilbert, Thije Boonkkamp, JHM Jan ten, IJzerman, W.L., van Lith, Bart S., van Lith, B.S., IJzerman, Wilbert L.   +10 more
core   +4 more sources

Optical Activation of TrkA Signaling [PDF]

ACS Synthetic Biology, 2018
Abstract Nerve growth factor/tropomyosin receptor kinase A (NGF/TrkA) signaling plays a key role in neuronal development, function, survival, and growth. The pathway is implicated in neurodegenerative disorders including Alzheimer’s disease, chronic pain, inflammation, and cancer. NGF binds the extracellular domain of
Liting Duan, Jen M. Hope, Shunling Guo, Qunxiang Ong, Amaury François, Luke Kaplan, Grégory Scherrer, Bianxiao Cui   +7 more
openaire   +3 more sources

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, Pascal Vola, Eduard Muslimov   +2 more
doaj   +1 more source