Results 21 to 30 of about 23,503 (294)

Amplitude Zone Plate in Adaptive Optics: Proposal of the Principle

open access: yesPhotonics, 2022
One of the main elements in hardware-based adaptive optics systems is a deformable mirror. There is quite a large number of such mirrors based on different principles and exhibiting varying performance.
Vasily Matkivsky   +3 more
doaj   +1 more source

Wide-Field Telescope Alignment Using the Model-Based Method Combined with the Stochastic Parallel Gradient Descent Algorithm

open access: yesPhotonics, 2021
To acquire images with higher accuracy of wide-field telescopes, deformable mirrors with more than 100 actuators are used, making the telescope alignment more complex and time-consuming.
Min Li, Ang Zhang, Junbo Zhang, Hao Xian
doaj   +1 more source

Active Optics–Freeform Segment Mirror Replications from a Deformable Matrix

open access: yesPhotonics, 2022
We present a new active optics method for making smooth aspheric, or freeform, mirrors by replication technique from an elastically deformable matrix.
Gerard R. Lemaitre, Patrick Lanzoni
doaj   +1 more source

A magnetic liquid deformable mirror for high stroke and low order axially symmetrical aberrations [PDF]

open access: yes, 2006
We present a new class of magnetically shaped deformable liquid mirrors made of a magnetic liquid (ferrofluid). Deformable liquid mirrors offer advantages with respect to deformable solid mirrors: large deformations, low costs and the possibility of very
Anna Ritcey   +4 more
core   +2 more sources

Swept source optical coherence tomography Gabor fusion splicing technique for microscopy of thick samples using a deformable mirror [PDF]

open access: yes, 2015
We present a swept source optical coherence tomography (OCT) system at 1060 nm equipped with a wavefront sensor at 830 nm and a deformable mirror in a closed-loop adaptive optics (AO) system.
Adrian Bradu   +5 more
core   +1 more source

Suppressing low-order eigenmodes with local control for deformable mirrors [PDF]

open access: yes, 2012
To improve the mechanical characteristics of actively controlled continuous faceplate deformable mirrors in adaptive optics, a strategy for reducing crosstalk between adjacent actuators and for suppressing low-order eigenmodes is proposed.
Andersen, Torben   +4 more
core   +1 more source

A direct comparison between a MEMS deformable mirror and a liquid crystal spatial light modulator in signal-based wavefront sensing [PDF]

open access: yesJournal of the European Optical Society-Rapid Publications, 2013
Aberrations degrade the performance of optical systems in terms of resolution and signal-to-noise ratio. This work explores the feasibility of a signal-based wavefront sensor, which employs a search algorithm to estimate Zernike coefficients of given ...
Jewel A. R., Akondi V., Vohnsen B.
doaj   +1 more source

Analysis of a discrete-layout bimorph disk elements piezoelectric deformable mirror [PDF]

open access: yes, 2018
We introduce a discrete-layout bimorph disk elements piezoelectric deformable mirror (DBDEPDM), driven by the circular flexural-mode piezoelectric actuators.
Chen, Ziguang   +4 more
core   +1 more source

Calibration and performance evaluation of a monomorph deformable mirror

open access: yesResults 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   +3 more
doaj   +1 more source

Research on a Decoupling Algorithm for the Dual-Deformable-Mirrors Correction System

open access: yesApplied Sciences, 2023
Wavefront distortion caused by atmospheric turbulence can be described as different types of aberrations, such as piston, tilt, defocusing, astigmatism, coma and so on.
Jingyuan Liang   +3 more
doaj   +1 more source

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