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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 10 — May. 12, 2008
  • pp: 7006–7013

Correction of horizontal turbulence with nematic liquid crystal wavefront corrector

Zhaoliang Cao, Quanquan Mu, Lifa Hu, Dayu Li, Yonggang Liu, Lu Jin, and Li Xuan  »View Author Affiliations

Optics Express, Vol. 16, Issue 10, pp. 7006-7013 (2008)

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To correct horizontal turbulences, a nematic liquid crystal wavefront corrector (NLC WFC) with a fast response is used. It can linearly modulate 2π radian at a wavelength of 633 nm. The closed-loop frequency of the adaptive optics system was originally only 12 Hz. Hence, a control system using the NLC WFC was developed, graphic processing units (GPUs) were used to compute the compensated wavefront, and the driving software for the NLC WFC was optimized. With these improvements, the closed loop frequency increased up to 60 Hz. Finally, the correction of a 500-m horizontal turbulence was performed with this fast adaptive system. After the correction, the averaged peak-to-valley (PV) and root-mean-square (RMS) values of the wavefront were reduced to 0.2λ and 0.06λ, respectively. The core of a fiber bundle is also resolved with a field angle of 0.68″. As the limit of the angular resolution of the telescope is 0.65″, the quasi-diffraction limited image is acquired with the closed-loop correction. It is shown that the NLC WFC has the ability to correct weak turbulences.

© 2008 Optical Society of America

OCIS Codes
(010.1080) Atmospheric and oceanic optics : Active or adaptive optics
(010.1330) Atmospheric and oceanic optics : Atmospheric turbulence
(230.3720) Optical devices : Liquid-crystal devices

ToC Category:
Adaptive Optics

Original Manuscript: February 25, 2008
Revised Manuscript: April 11, 2008
Manuscript Accepted: April 23, 2008
Published: May 1, 2008

Zhaoliang Cao, Quanquan Mu, Lifa Hu, Dayu Li, Yonggang Liu, Lu Jin, and Li Xuan, "Correction of horizontal turbulence with nematic liquid crystal wavefront corrector," Opt. Express 16, 7006-7013 (2008)

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