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The discrete sampling of a wave-front using a Shack-Hartmann sensor limits the maximum spatial frequency we can measure and impacts sensitivity to frequencies at the high end of the correction band due to aliasing.
23 de nov. de 2018 · Noise, aliasing, and modal cross-coupling (Herrmann 1981) are effects introduced by the SH-WFS which degrade the quality of the wavefront reconstructions and limit the accuracy of the method. Aliasing results from the finite spatial resolution of the SH-WFS when sampling phase gradients of turbulence-induced distorted phases which have non ...
We propose in this paper an analytical study of the aliasing effect, and study how the aliasing error distributes over temporal frequencies. An analytical expression of the temporal spectrum of the aliasing error maybe of importance for system modeling or performance prediction in adaptive optics.
Further-more, the finite resolution of the sensor introduces aliasing. In this article the impact of these effects on atmospheric turbulence parameter estimation is addressed with sim-ulations. It is found that cross coupling is the dominant bias. An iterative algorithm to overcome it is presented.
6 de ene. de 2023 · Shack-Hartmann wavefront sensor plays a key role in adaptive optics (AO) systems, which detect the aberrant wavefront by an array of micro-lenslets across the aperture pupil.
6 de ene. de 2023 · Shack-Hartmann wavefront sensor plays a key role in adaptive optics (AO) systems, which detect the aberrant wavefront by an array of micro-lenslets across the aperture pupil. However, some sub-apertures would be a lack of light induced by the imperfectness of micro-lenslets or pupil shift away from the optical path.
We propose a simple optical modification to a SH WFS (borrowed from the digital video camera industry), and present simulation results showing that the aliasing errors are reduced.
