Results 291 to 300 of about 2,071,972 (337)
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MEMS reflective wavefront sensor
SPIE Proceedings, 2007Sandia National Laboratory has constructed several segmented MEMS deformable mirrors that are under investigation for their suitability in Adaptive Optics systems for the Naval Research Laboratory. These mirrors are constructed in a hexagonal array and have been constructed with flat surfaces, or with optical power allowing each mirror to bring its
Jonathan R. Andrews +6 more
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Integrated Optical Wavefront Sensor
SPIE Proceedings, 1985This 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
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Fourier wavefront reconstruction with a pyramid wavefront sensor
Adaptive Optics Systems VI, 2018Using Fourier methods to reconstruct the phase measured by a wavefront sensor (WFS) can significantly re- duce the number of computations required, as well as easily enable predictive reconstruction methods based on knowledge of the adaptive optics system, atmospheric turbulence and wind profile. Previous work on Fourier re- construction has focused on
Bond, Charlotte +5 more
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SPIE Proceedings, 2003
The method of reconstruction of wavefront modes such as the Hartmann one is considered. Complete data about modes using magnification of number of measured numerical performances of the image created by each of them, not using magnification of number of the subapertures is offered.
Gennadii Degtyarev +3 more
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The method of reconstruction of wavefront modes such as the Hartmann one is considered. Complete data about modes using magnification of number of measured numerical performances of the image created by each of them, not using magnification of number of the subapertures is offered.
Gennadii Degtyarev +3 more
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Improved linear response in a modal wavefront sensor.
Journal of The Optical Society of America A-optics Image Science and Vision, 2019The 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
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Digital pyramid wavefront sensor
Imaging and Applied Optics, 2013We demonstrate the possibility of sensing defocus and a combination of defocus and astigmatism aberrations using a digital pyramid wavefront sensor based on a spatial light modulator which allows easy modulation of the pyramid without the need for moving parts.
Vyas Akondi +3 more
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1998
Abstract The development of adaptive optics has fostered a new generation of wavefront sensors, instruments with speeds and sensitivities that are orders of magnitude greater than anything known before 1970. Compensation for atmospheric turbulence requires the measurement of randomly distorted wavefronts in real time, using only a faint ...
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Abstract The development of adaptive optics has fostered a new generation of wavefront sensors, instruments with speeds and sensitivities that are orders of magnitude greater than anything known before 1970. Compensation for atmospheric turbulence requires the measurement of randomly distorted wavefronts in real time, using only a faint ...
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Hybrid wavefront sensor for the fast detection of wavefront disturbances
Applied Optics, 2012Strongly aberrated wavefronts lead to inaccuracies and nonlinearities in holography-based modal wavefront sensing (HMWS). In this contribution, a low-resolution Shack-Hartmann sensor (LRSHS) is incorporated into HMWS via a compact holographic design to extend the dynamic range of HMWS.
Shihao, Dong +2 more
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Absolute calibration of a Shack-Hartmann wavefront sensor for measurements of wavefronts
OPTO, 2019A high-quality flat wave front is usually used to calibrate the Shach-Hartmann wave-front sensors. The article discusses the possibility of calibrating sensors with spherical wave fronts.
A. Nikitin +7 more
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Fast holographic wavefront sensor
SPIE Proceedings, 2006In this talk we will present a new zonal wavefront sensor. The device is able to take a single incident beam and diffract it into multiple beams with different focal locations, according to the presence and strength of particular aberrations. The Zernike terms in the beam are simply read out according to the location of the foci on the image plane ...
Peter Dyrud, Geoff Andersen
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