Results 21 to 30 of about 864,560 (239)

Various Wavefront Sensing and Control Developments on the Santa Cruz Extreme AO Laboratory (SEAL) Testbed

, 2022
Ground-based high contrast imaging (HCI) and extreme adaptive optics (AO) technologies have advanced to the point of enabling direct detections of gas-giant exoplanets orbiting beyond the snow lines around nearby young star systems.
Jensen-Clem, Rebecca, Cetre, Sylvain, Amata, Hadi, Gerard, Benjamin L., Fu, Qiang, Perez-Soto, Javier, Dillon, Daren, Heidrich, Wolfgang, Chambouleyron, Vincent, van Kooten, Maaike A. M.   +9 more
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Depth-Resolved Wavefront Aberrations using a Coherence-Gated Shack-Hartmann Wavefront Sensor [PDF]

, 2010
In the present paper we investigate the possibility of narrowing the depth range of a physical Shack - Hartmann (SH) wavefront sensor (WFS) by using coherence gating.
Tuohy, Simon, Podoleanu, Adrian G.H.
core   +1 more source

A Tip–Tilt and Piston Detection Approach for Segmented Telescopes

Photonics, 2020
Accurate segmented mirror wavefront sensing and control is essential for next-generation large aperture telescope system design. In this paper, a direct tip–tilt and piston error detection technique based on model-based phase retrieval with multiple ...
Shun Qin, Wai Kin Chan
doaj   +1 more source

Near-infrared wavefront sensing [PDF]

, 2018
We discuss the advantages of wavefront sensing at near-infrared (IR) wavelengths with low-noise detector technologies that have recently become available.
Rigaut, Francois, Wizinowich, Peter, Agapito, Guido, Fusco, Thierry, Chun, Mark, Dekany, Richard G, Mawet, Dimitri, Guyon, Olivier, Esposito, Simone, Hall, Donald, Plantet, Cedric   +10 more
core   +3 more sources

Digging Deeper through Biological Specimens Using Adaptive Optics-Based Optical Microscopy

Photonics, 2023
Optical microscopy is a vital tool for visualizing the cellular and sub-cellular structures of biological specimens. However, due to its limited penetration depth, its biological applicability has been hindered.
Gagan Raju, Nirmal Mazumder
doaj   +1 more source

Focal plane wavefront sensing on SUBARU/SCExAO [PDF]

, 2020
Focal plane wavefront sensing is an elegant solution for wavefront sensing since near-focal images of any source taken by a detector show distortions in the presence of aberrations.
Norris, B., Keller, Christoph U., Sahoo, Ananya, Lozi, Julien, Mugnier, Laurent, M, Christoph U. Keller, Mamadou N'Diaye, Miller, Kelsey L., Lozi, J., Nour Skaf, Aurélie Bonnefois, Ananya Sahoo, Vincent Deo, Nemanja Jovanovic, Bos, S. P., Currie, T., Masen P. Lamb, Thayne Currie, Vievard, S., N'Diaye, M., Lopez, Coline, Snik, Frans, Bos, Steven,, Lamb, Masen, Vievard, Sébastien, Mary, D, Lopez, C., Mugnier, Laurent M., Wilby, M. J., Frans Snik, N'Diaye, Mamadou, Steven P. Bos, Montmerle-Bonnefois, A, Guyon, O., Sahoo, A., Keller, Christoph,, Martinache, F., Montmerle-Bonnefois, A., Skaf, N., Alison Wong, Mugnier, L. M., Bonnefois, Aurélie, Deo, V., Coline Lopez, Cassaing, F., Jean-Francois Sauvage, Lamb, M., Wong, Alison, Martinache, Frantz, Keller, Christoph, U, Frédéric Cassaing, Laurent M. Mugnier, Barnaby Norris, Norris, Barnaby, Julien Lozi, Bos, Steven P., Sauvage, J-F, Keller, C. U., Miller, K., Sauvage, J.-F., Currie, Thayne, Wilby, Michael,, Jovanovic, Nemanja, Montmerle-Bonnefois, Aurélie, Miller, Kelsey, Frantz Martinache, Mary, D., Lamb, Masen P., Olivier Guyon, Sauvage, Jean-Francois, Wilby, Michael, J, Mugnier, Laurent,, Snik, F., Deo, Vincent, Jovanovic, N., Cassaing, Frédéric, Sébastien Vievard, Michael J. Wilby, Bos, Steven, P, Kelsey L. Miller, Skaf, Nour, Wong, A., Guyon, Olivier, Wilby, Michael J.   +83 more
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Wavefront measurement method based on improved light field camera

Results in Physics, 2020
The light field camera is used in the wavefront sensing field because of its simple structure, large field of view, high utilization rate of light energy, etc.
Xin Chen, Wenke Xie, Haotong Ma, Junqiu Chu, Bo Qi, Ge Ren, Xuecheng Sun, Fanglin Chen   +7 more
doaj   +1 more source

Beam wavefront retrieval by convoluted spatial spectral benchmark

Matter and Radiation at Extremes, 2021
We propose a method for retrieving a beam wavefront from its near-field intensity distribution after a 4f system by simply inserting a benchmark at the Fourier plane.
Xuewei Deng, Xiaoxia Huang, Deen Wang, Ying Yang, Xin Zhang, Dongxia Hu   +5 more
doaj   +1 more source

Calibration and performance evaluation of a monomorph deformable mirror

Results in Optics, 2022
To achieve diffraction-limited performance with a 50 cm solar telescope at the Udaipur solar observatory the development of a high-order adaptive optics (AO) system is currently in progress. The system includes a monomorph deformable mirror (MDM) with 85
A. Raja Bayanna, Bireddy Ramya, Shibu K. Mathew, Rohan E. Louis   +3 more
doaj   +1 more source

Wavefront-sensing with a thin diffuser

, 2017
We propose and implement a broadband, compact, and low-cost wavefront sensing scheme by simply placing a thin diffuser in the close vicinity of a camera. The local wavefront gradient is determined from the local translation of the speckle pattern.
Pascal Berto (1919980), Hervé Rigneault (2482108), Marc Guillon (4180657)   +2 more
core   +1 more source