Results 301 to 310 of about 2,024,523 (345)

Multiscale optimization of the geometric wavefront sensor

Applied Optics, 2021
Since wavefront distortions cannot be directly measured from an image, a wavefront sensor (WFS) can use intensity variations from a point source to estimate slope or curvature of a wavefront. However, processing of measured aberration data from WFSs is computationally intensive, and this is a challenge for real-time image restoration or correction.
Saloni Pal, Richard Clare, Andrew Lambert, Stephen Weddell   +3 more
openaire   +3 more sources

Wavefront reconstruction for the Shack-Hartmann wavefront sensor

SPIE Proceedings, 2002
The Shack-Hartmann wavefront sensor is a powerful tool for optical analysis. A vital step in the data analysis chain involves reconstructing the wavefront incident upon the lenslet array from hundreds or thousands of slope measurements. We discuss here the basics of reconstruction and the differences in reconstruction for the case of Hartmann and Shack-
openaire   +2 more sources

A fast wavefront reconstructor for the nonlinear curvature wavefront sensor

Adaptive Optics Systems VI, 2018
The Nonlinear Curvature Wavefront Sensor (nlCWFS), first proposed by Guyon, determines wavefront shape from images of a reference beacon in a number of planes between the pupil and focal plane of a telescope. We describe a new algorithm that rapidly recovers the low-order aberrations accurately enough to allow practical use of the nlCWFS in an adaptive
Johanan L. Codona, Michael Hart, Mala Mateen   +2 more
openaire   +2 more sources

Improved linear response in a modal wavefront sensor.

Journal of The Optical Society of America A-optics Image Science and Vision, 2019
The modal wavefront sensor provides a direct and less computationally intensive way, relative to a zonal wavefront sensor, of estimating the various aberration modes present in a beam of light.
Santanu Konwar, B. Boruah
semanticscholar   +1 more source

Wavefront reconstruction using smartphone based wavefront sensors

SPIE Proceedings, 2015
Smartphone camera system has the capability of being integrated into powerful field-sensing tools, capturing data and sharing these data with computing servers or cloud experts. The purpose of this work is to implement a wavefront sensor based on the smartphone platform, which has many potential applications in thin-films and bio-related sensing areas.
Zhenyu Yang, Qiwen Zhan
openaire   +2 more sources

Effects of the LGS geometry on the Shack-Hartmann wavefront sensor and the Pyramid wavefront sensor

Adaptive Optics Systems IX
In this work we study the effects of the laser guide star (LGS) on the measurements of both the Shack-Hartmann wavefront sensor (SHWFS) and the Pyramid wavefront sensor (PWFS). We started by describing the LGS geometry and the general effects on each wavefront sensor.
Oyarzun, Francisco, Heritier, Cedric Taïssir, Chambouleyron, Vincent, Fusco, Thierry, Rouquette, Paul, Neichel, Benoît   +5 more
openaire   +1 more source

Improvements to the modal holographic wavefront sensor

Applied Optics, 2016
The Zernike coefficients of a light wavefront can be calculated directly by intensity ratios of pairs of spots in the reconstructed image plane of a holographic wavefront sensor (HWFS). However, the response curve of the HWFS heavily depends on the position and size of the detector for each spot and the distortions introduced by other aberrations.
Andrew Lambert, Fanpeng Kong
openaire   +3 more sources

Digital holographic wavefront sensor

Imaging and Applied Optics 2015, 2015
For free-space laser communications and for tracking of high-speed airborne objects Shack-Hartmann sensor is not effective. Its performance is limited by scintillation. We characterize a promising modal alternative: digital holographic wavefront sensor. The sensor is very robust to scintillation, residual tip/tilt and misalignments.
Marin-Palomo, P., Zepp, A., Gladysz, S.
openaire   +3 more sources

Integrated Optical Wavefront Sensor

SPIE Proceedings, 1985
This paper presents a design for an integrated optical wavefront sensor. Light from an aperture is focussed by a lens onto a detector array. The resulting signals can be used to determine the amount of angular tilt of the wavefront. Parameters affecting angular resolution are analyzed. Tilt angles as small as 10 -5 rad are detectable.
H. E. Tomaschke, R. R. Rice
openaire   +2 more sources

An Improved Holographic Wavefront Sensor

Imaging and Applied Optics 2016, 2016
We present a more robust holographic wavefront sensor (HWFS) which is less affected by aberrations during reconstruction and works in multiwavelength and broadband light.
Andrew Lambert, Fanpeng Kong
openaire   +2 more sources