Issue |
J. Eur. Opt. Soc.-Rapid Publ.
Volume 10, 2015
|
|
---|---|---|
Article Number | 15036 | |
Number of page(s) | 6 | |
DOI | https://doi.org/10.2971/jeos.2015.15036 | |
Published online | 12 July 2015 |
Regular paper
Compensation of phase nonlinearity of liquid crystal spatial light modulator for high-resolution wavefront correction
1
Intelligent Machine Institute, Harbin University of Science and Technology
2
Institute of Photonics and Optical Fiber Technology, Harbin University of Science and Technology, No. 52 Xuefu Road, Harbin, Heilongjiang, 150080, China
Received:
10
May
2015
Revised:
20
June
2015
The ability of phase modulation enables liquid crystal spatial light modulator (LCSLM) to control wavefront. However, the disadvantage of its inherent nonlinear phase response will decrease the wavefront control accuracy. In this paper, a compensation for the nonlinear phase response is proposed based on Inverse Interpolation method. Characteristic curve of phase retardation versus gray levels for a 256×256 pixels phase-only LCSLM has been measured and calibrated by Inverse Interpolation. A mapping relationship between input gray levels and driving gray levels has been built and recorded by a linear look-up table ANTI2.LUT. The nonlinear error of the phase drops from 15.9% to 2.42% by using ANTI2.LUT. Further more, the mapping curve of ANTI2.LUT is almost consistent with 290.LUT from the manufacturer, which proved the efficiency of the compensation of phase nonlinearity. Finally, the distorted wavefront caused by a liquid crystal flake is corrected using LCSLM based on ANTI2.LUT. Experimental results show that the peak-valley value of the distorted wavefront decreases from 1.56λ to 0.26λ (λ =0.6328 μm), the root-mean-square value decreases from 0.25λ to 0.02λ and the Strehl ratio of diffractive spots increases from 0.08 to 0.97. So LCSLM can be applied to realize high-precision and high-resolution wavefront correction with linear phase response.
Key words: Wavefront correction / phase nonlinearity compensation / inverse interpolation / liquid crystal spatial light modulator
© The Author(s) 2015. All rights reserved.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.