As an astronomical image post-processing technique, deconvolution from wavefront sensing (DWFS) is a powerful and
low cost method for adaptive optics (AO) images reduction. It is based on deconvolution of short exposure images and
simultaneous measuring wavefront sensor data, both are provided by adaptive optics system to improve the quality of
images. However, for extended or dim sources observing, limited precision of the Wave Front Sensor (WFS) will lead to
inferior correction quality of AO images, also these can hardly enhanced by DWFS method. We show here a simple and
efficient solution, which combines the DWFS method with a shift-and-add (SAA) image reconstruction technique,
designed for reduction of astronomical data obtained with AO system, especially extended objects. This scheme has been
applied to the upgraded 61-actuator Shack-Hartmann based adaptive optics system, partially primary corrected extended
object images at Yunnan observatory 1.2m telescope for astronomical high resolution imaging. Experimental result of
Mars was presented.
A 61-actuator adaptive optical system has been upgraded at Yunnan
observatory 1.2m telescope since 2004, and is
only one visible wavelength AO system in China now. Considering its relative small diameter and angular resolution,
the main purpose of this AO system, besides the high resolution astronomical imaging, is for long distance laser
ranging. This paper describes these AO system performances and its observation results, and the possible application
on lunar laser ranging.
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