Wide-band high-resolution synthetic imaging of a segmented large-scaled lightweight diffractive telescope

In this Letter, we report a segmented large-scaled lightweight diffractive telescope testbed newly built in our laboratory. The telescope, consisting of one 710-mm-diameter element in the center surrounded by eight 352-mm-diameter elements and a smaller eyepiece of achromatic lenses, can realize wid...

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Bibliographic Details
Published in:Optics letters 2020-04, Vol.45 (7), p.1790-1793
Main Authors: Liu, Yang, Xie, Zongliang, Ma, Haotong, Chu, Junqiu, Ma, Xiafei, Tan, Yufeng, Liu, Dun, Bian, Jiang, Hu, Hongyi, Fan, Bin, Qi, Bo
Format: Article
Language:English
Subjects:
High resolution
Image contrast
Image quality
Image resolution
Image restoration
Lightweight
Stitching
Telescopes
Tip tilt
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Summary:In this Letter, we report a segmented large-scaled lightweight diffractive telescope testbed newly built in our laboratory. The telescope, consisting of one 710-mm-diameter element in the center surrounded by eight 352-mm-diameter elements and a smaller eyepiece of achromatic lenses, can realize wide-band high-resolution imaging of 0.55-0.65 µm. The stitching errors are coarsely corrected by adjusting the motion stage mounted on each element. In particular, an optical synthesis system inserted behind the eyepiece is designed to compensate the residual tip-tilt-piston errors. We present the experimental imaging result of two stitched elements, which is the first successful experimental verification obtained by a practical segmented diffractive telescope to enhance the resolution. Moreover, spatial modulation diversity technology is used to restore the synthetic image so as to improve its quality and contrast.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.386694