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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 17 — Aug. 13, 2012
  • pp: 19331–19342

Optimal energy-splitting method for an open-loop liquid crystal adaptive optics system

Zhaoliang Cao, Quanquan Mu, Lifa Hu, Yonggang Liu, Zenghui Peng, Qingyun Yang, Haoran Meng, Lishuang Yao, and Li Xuan  »View Author Affiliations


Optics Express, Vol. 20, Issue 17, pp. 19331-19342 (2012)
http://dx.doi.org/10.1364/OE.20.019331


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Abstract

A waveband-splitting method is proposed for open-loop liquid crystal adaptive optics systems (LC AOSs). The proposed method extends the working waveband, splits energy flexibly, and improves detection capability. Simulated analysis is performed for a waveband in the range of 350 nm to 950 nm. The results show that the optimal energy split is 7:3 for the wavefront sensor (WFS) and for the imaging camera with the waveband split into 350 nm to 700 nm and 700 nm to 950 nm, respectively. A validation experiment is conducted by measuring the signal-to-noise ratio (SNR) of the WFS and the imaging camera. The results indicate that for the waveband-splitting method, the SNR of WFS is approximately equal to that of the imaging camera with a variation in the intensity. On the other hand, the SNR of the WFS is significantly different from that of the imaging camera for the polarized beam splitter energy splitting scheme. Therefore, the waveband-splitting method is more suitable for an open-loop LC AOS. An adaptive correction experiment is also performed on a 1.2-meter telescope. A star with a visual magnitude of 4.45 is observed and corrected and an angular resolution ability of 0.31″ is achieved. A double star with a combined visual magnitude of 4.3 is observed as well, and its two components are resolved after correction. The results indicate that the proposed method can significantly improve the detection capability of an open-loop LC AOS.

© 2012 OSA

OCIS Codes
(010.1080) Atmospheric and oceanic optics : Active or adaptive optics
(230.3720) Optical devices : Liquid-crystal devices
(010.1285) Atmospheric and oceanic optics : Atmospheric correction

ToC Category:
Adaptive Optics

History
Original Manuscript: June 26, 2012
Manuscript Accepted: July 25, 2012
Published: August 8, 2012

Citation
Zhaoliang Cao, Quanquan Mu, Lifa Hu, Yonggang Liu, Zenghui Peng, Qingyun Yang, Haoran Meng, Lishuang Yao, and Li Xuan, "Optimal energy-splitting method for an open-loop liquid crystal adaptive optics system," Opt. Express 20, 19331-19342 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-17-19331


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