Wavefront sensors for adaptive optical systems
نویسندگان
چکیده
منابع مشابه
X-ray wavefront characterization with two-dimensional wavefront sensors: shearing interferometers and Hartmann wavefront sensors
Phase reconstructions from a two-dimensional shearing inter-ferometer, based on two orthogonal phase gratings in a single plane, and a Hartmann sensor are compared. Design alternatives for both wavefront sensors are given, and simulated performance of both the two-dimensional x-ray shearing interferometer and Hartmann wavefront sensor are presented for two different phase profiles. The first co...
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In tomographic adaptive-optics (AO) systems, errors due to tomographic wavefront reconstruction limit the performance and angular size of the scientific field of view (FoV), where AO correction is effective. We propose a multi time-step tomographic wavefront reconstruction method to reduce the tomographic error by using measurements from both the current and previous time steps simultaneously. ...
متن کاملWavefront Estimation for Adaptive Optics Systems on Ground-Based Telescopes
Here M(x, y) is the telescope’s pupil indicator function, i.e. is 1 inside the pupil and 0 otherwise, and the function φ(x, y) denotes the phase error, or simply the phase, and is determined by the deviation from planarity of the incoming wavefronts of light at the point (x, y). In Figure 1, we plot (2) in the diffraction limited case, i.e. when φ = 0, and with a nonzero φ generated by a physic...
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We are currently facing an increasing amount of challenges in the area of photonics as more and more applications in need for active “photon control” sprout in different fields of science. Adaptive Optics (AO) is the subject which deals with measuring, reconstructing, and reshaping the phase of a photon wavefront in real-time and can, thus, provide the framework for controlling the photons in a...
متن کاملPhoton counting arrays for AO wavefront sensors
Future wavefront sensors for AO on large telescopes will require a large number of pixels and must operate at high frame rates. Unfortunately for CCDs, there is a readout noise penalty for operating faster, and this noise can add up rather quickly when considering the number of pixels required for the extended shape of a sodium laser guide star observed with a large telescope. Imaging photon co...
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ژورنال
عنوان ژورنال: Measurement Science Review
سال: 2010
ISSN: 1335-8871
DOI: 10.2478/v10048-010-0016-4