Results 31 to 40 of about 695,193 (215)
Ultrafast laser stress figuring for accurate deformation of thin mirrors [PDF]
, 2022 Fabricating freeform mirrors relies on accurate optical figuring processes capable of arbitrarily modifying low-spatial frequency height without creating higher-spatial frequency errors. We present a scalable process to accurately figure thin mirrors using stress generated by a focused ultrafast laser.
arxiv +1 more source
Adaptive Optical Closed-Loop Control Based on the Single-Dimensional Perturbation Descent Algorithm
Sensors, 2023 Modal-free optimization algorithms do not require specific mathematical models, and they, along with their other benefits, have great application potential in adaptive optics.
Bo Chen +4 more
doaj +1 more source
A Design Study on Adaptive Primaries for 1-2 Meter Class Telescopes [PDF]
arXiv, 2021 Adaptive optics (AO) offers an opportunity to stabilize an image and maximize the spatial resolution achievable by ground based telescopes by removing the distortions due to the atmosphere. Typically, the deformable mirror in an AO system is integrated into the optical path between the secondary mirror and science instrument; in some cases, the ...
arxiv
Investigation of PZT Materials for Reliable Piezostack Deformable Mirror with Modular Design
Micromachines, 2023 This article presents a study of the electrophysical properties of a piezoceramic material for use in adaptive optics. The key characteristics that may be important for the manufacturing of piezoelectric deformable mirrors are the following ...
Vladimir Toporovsky +5 more
doaj +1 more source
Optics Express, 2018 Free-space quantum key distribution (QKD) is important to realize a global-scale quantum communication network. However, performing QKD in daylight against the strong background light noise is a major challenge.
Y. Gong +13 more
semanticscholar +1 more source
Micromachines, 2023 A common problem in deformable mirror assembly is that the adhesion of actuators to an optical mirror face sheet introduces unwanted topography due to large local stresses generated at the adhesive joint.
Wenkuan Man, Thomas G. Bifano
doaj +1 more source
An Efficient Method for Wavefront Aberration Correction Based on the RUN Optimizer
Photonics, 2023 The correction of wavefront aberrations in wavefront sensorless (WFS-less) adaptive optical (AO) systems requires control algorithms that can ensure rapid convergence while maintaining effective correction capabilities.
Huizhen Yang +6 more
doaj +1 more source
A magnetic liquid deformable mirror for high stroke and low order axially symmetrical aberrations [PDF]
, 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 large mirrors with added aberration control. They have some disadvantages (e.g.
arxiv +1 more source
Tuning the Thermal Expansion Properties of Optical Reference Cavities with Fused Silica Mirrors [PDF]
JOSA B, Vol. 27, Issue 5, pp. 914-919 (2010), 2010 We investigate the thermal expansion of low thermal noise Fabry-Perot cavities made of Low Thermal Expansion (LTE) glass spacers and Fused Silica (FS) mirrors. The different thermal expansion of mirror and spacer deforms the mirror. This deformation strongly contributes to the cavity's effective Coefficient of Thermal Expansion (CTE), decreasing the ...
arxiv +1 more source
Mode-Voltage Constrained Control for Adaptive Optics System
IEEE Photonics JournalIn the adaptive optics system of astronomical observation, the deformable mirror and the tip/tilt mirror are coupled during the correction process.
Ruitao Wang +7 more
doaj +1 more source