Adaptive Shack-Hartmann wavefront sensor accommodating large wavefront variations
نویسندگان
چکیده
منابع مشابه
Measurement Error of Shack-Hartmann Wavefront Sensor
A Shack-Hartmann sensor is one of the most important and popular wavefront sensors used in an adaptive optics system to measure the aberrations caused by either atmospheric turbulence, laser transmission, or the living eye [1-7]. Its design was based on an aperture array that was developed in 1900 by Johannes Franz Hartmann as a means to trace individual rays of light through the optical system...
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The design of a wavefront sensor may be determined by the lenslet array and camera selection. There are numerous different applications for these sensors, requiring widely differing dynamic range and accuracy. Performance metrics are needed to evaluate candidate designs and to compare results. We have developed a standard methodology for measuring the repeatability, accuracy and dynamic range o...
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A Shack-Hartmann wavefront sensor (SHWFS) that consists of a microlens array and an image sensor has been used to measure the wavefront aberrations of human eyes. However, a conventional SHWFS has finite dynamic range depending on the diameter of the each microlens. The dynamic range cannot be easily expanded without a decrease of the spatial resolution. In this study, an adaptive spot search m...
متن کاملDetection of phase singularities with a Shack-Hartmann wavefront sensor.
While adaptive optical systems are able to remove moderate wavefront distortions in scintillated optical beams, phase singularities that appear in strongly scintillated beams can severely degrade the performance of such an adaptive optical system. Therefore the detection of these phase singularities is an important aspect of strong-scintillation adaptive optics. We investigate the detection of ...
متن کاملCoherence-gated Shack-Hartmann wavefront sensor insensitive to stray reflections
Due to the limited numerical aperture in the beams associated with each microlens in the lenslet array (LA), a Shack – Hartmann wavefront sensor (SH/WFS) has little sensitivity to the position in depth in the object where the signal comes from. This makes the SH/WFS insensitive to depth variations of aberrations. Consequently, stray reflections from the interface optics cannot be rejected and t...
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ژورنال
عنوان ژورنال: Optics Express
سال: 2018
ISSN: 1094-4087
DOI: 10.1364/oe.26.034428