Document Detail

Open-loop control of liquid-crystal spatial light modulators for vertical atmospheric turbulence wavefront correction.
MedLine Citation:
PMID:  21221164     Owner:  NLM     Status:  In-Data-Review    
We present an open-loop adaptive optics (AO) system based on two liquid-crystal spatial light modulators (LCSLMs) that profit from high precision wavefront generation and good repeatability. A wide optical bandwidth of 300nm is designed for the system, and a new open-loop optical layout is invented to conveniently switch between the open and closed loop. The corresponding control algorithm is introduced with a loop frequency (the reciprocal of the total time delay of a correction loop) of 103Hz. The system was mounted onto a 2.16m telescope for vertical atmospheric turbulence correction. The full width at half-maximum of the image of the star α Boo reached 0.636arcsec⁡ after the open-loop correction, while it was 2.12arcsec⁡ before the correction. The result indicates that the open-loop AO system based on LCSLMs potentially has the ability to be used for general astronomical applications.
Chao Liu; Lifa Hu; Quanquan Mu; Zhaoliang Cao; Li Xuan
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Applied optics     Volume:  50     ISSN:  1539-4522     ISO Abbreviation:  Appl Opt     Publication Date:  2011 Jan 
Date Detail:
Created Date:  2011-01-11     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0247660     Medline TA:  Appl Opt     Country:  United States    
Other Details:
Languages:  eng     Pagination:  82-9     Citation Subset:  IM    
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