Correcting the wavefront aberration of membrane mirror based on liquid crystal spatial light modulator

2014 ◽  
Author(s):  
Bin Yang ◽  
Yin Wei ◽  
Xinhua Chen ◽  
Minxue Tang
Keyword(s):  
Liquid Crystal ◽  
Spatial Light Modulator ◽  
Wavefront Aberration ◽  
Light Modulator

High-Resolution Correction of Arbitrary Wavefront Aberration Using Liquid Crystal Spatial Light Modulator

2011 ◽  
Vol 121-126 ◽  
pp. 877-881
Author(s):  
Hong Xin Zhang ◽  
Xiao Xi Xu
Keyword(s):  
Liquid Crystal ◽  
High Resolution ◽  
Spatial Light Modulator ◽  
Low Cost ◽  
Phase Conjugation ◽  
Astronomical Observation ◽  
Wavefront Aberration ◽  
Strehl Ratio ◽  
Light Modulator ◽  
Wavefront Correction

Wavefront correction plays significant role in some fields like astronomical observation, laser processing and medical imaging, etc. Liquid crystal spatial light modulator ( LC SLM) is an ideal device for high-resolution wavefront correction because of its low cost, low consumption, large number of pixels and independent programming control of each unit. It is researched experimentally that LC SLM is used as a wavefront correction device and corrects arbitrary wavefront aberration. Wavefront correction is performed based on phase conjugation and periodic phase modulation with modulo-2π. The experimental results show that the PV value of the irregular wavefront aberration is 1.56λ, RMS value is 0.25 and Strehl ratio is 0.08 before correction, but the PV value of the residual aberration is reduced to 0.26λ, RMS value is 0.02 and Strehl ratio is increased to 0.97 which is approximated diffraction limit after correction. It is proved to be feasible and effective that LC SLM is used to the high-precision and high-resolution wavefront correction.

128 x 128 analog liquid crystal spatial light modulator

1995 ◽  
Author(s):  
Steven A. Serati ◽  
Gary D. Sharp ◽  
Roylnn A. Serati ◽  
Douglas J. McKnight ◽  
Jay E. Stockley
Keyword(s):  
Liquid Crystal ◽  
Spatial Light Modulator ◽  
Light Modulator

Hyperresolving phase-only filters with an optically addressable liquid crystal spatial light modulator

Micron ◽  
2003 ◽  
Vol 34 (6-7) ◽  
pp. 327-332 ◽  
Author(s):  
J. McOrist ◽  
M.D. Sharma ◽  
C.J.R. Sheppard ◽  
E. West ◽  
K. Matsuda
Keyword(s):  
Liquid Crystal ◽  
Spatial Light Modulator ◽  
Light Modulator

scholarly journals Phase Compensation of the Non-Uniformity of the Liquid Crystal on Silicon Spatial Light Modulator at Pixel Level

Sensors ◽  
2021 ◽  
Vol 21 (3) ◽  
pp. 967
Author(s):  
Zhen Zeng ◽  
Zexiao Li ◽  
Fengzhou Fang ◽  
Xiaodong Zhang
Keyword(s):  
Liquid Crystal ◽  
Phase Modulation ◽  
Spatial Light Modulator ◽  
Characteristic Curve ◽  
Physical Structure ◽  
Measuring System ◽  
Light Modulator ◽  
Phase Compensation ◽  
Modulation Characteristic ◽  
Liquid Crystal On Silicon

Phase compensation is a critical step for the optical measuring system using spatial light modulator (SLM). The wavefront distortion from SLM is mainly caused by the phase modulation non-linearity and non-uniformity of SLM’s physical structure and environmental conditions. A phase modulation characteristic calibration and compensation method for liquid crystal on silicon spatial light modulator (LCoS-SLM) with a Twyman-Green interferometer is illustrated in this study. A method using two sequences of phase maps is proposed to calibrate the non-uniformity character over the whole aperture of LCoS-SLM at pixel level. A phase compensation matrix is calculated to correct the actual phase modulation of the LCoS-SLM and ensure that the designed wavefront could be achieved. Compared with previously known compensation methods, the proposed method could obtain the phase modulation characteristic curve of each pixel on the LCoS-SLM, rather than a mono look-up table (LUT) curve or multi-LUT curves corresponding to an array of blocks over the whole aperture of the LCoS-SLM. The experiment results show that the phase compensation precision could reach a peak-valley value of 0.061λ in wavefront and this method can be applied in generating freeform wave front for precise optical performance.

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