Abstract
The plenoptic wavefront sensor (PlWFS) has been proposed as being suitable for operating on extended objects in adaptive optics (AO) systems. We propose a new self-referencing method that uses the cell image of PlWFS as a correlation reference and enables the simultaneous measurement of high-order aberrations and tilt. Simulations have been performed for different operating conditions to verify the feasibility of the proposed method. These show that using the cell image results in better AO performance compared to existing reference generation techniques and allows stable wavefront tilt control with a small residual variance.
Highlights
The imaging performance of ground-based telescopes is always constrained by the atmosphere that causes degradation of the image quality
The deformable mirror (DM) simulated in this paper is a piezoelectric stack-array actuator DM, where the influence function of each actuator is simulated by a Gaussian function
We presented a new way to select correlation reference images in PlWFS wavefront sensing on extended objects
Summary
The imaging performance of ground-based telescopes is always constrained by the atmosphere that causes degradation of the image quality. We investigate both PlWFS tilt and high-order wavefront sensing using different methods of generating the reference for the correlation algorithm. We investigate this performance in both open- and closed-loop AO systems. Where Sx , Sy are the local wavefront gradients, x , y are the shifts of the recomposed subaperture images in pixels, d is the lenslet pitch, and f M is the focal length of the main lens forming the image on the lenslet array. A thresholded and windowed center-of-mass (COM) algorithm is applied to obtain subpixel measurement accuracy
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