Birefringence measurement on the liquid crystal by phase modulation technique

1990 ◽  
Vol 7 (1) ◽  
pp. 18-21 ◽  
Author(s):  
Kang Ho Yoon ◽  
O Ok Park ◽  
Jong-Duk Kim
Keyword(s):  
Liquid Crystal ◽  
Phase Modulation ◽  
Modulation Technique

Binary phase modulation properties of a programmable liquid-crystal television display

1992 ◽  
Vol 31 (35) ◽  
pp. 7393 ◽  
Author(s):  
B. S. Lowans ◽  
B. Bates ◽  
R. G. H. Greer ◽  
J. Aiken
Keyword(s):  
Liquid Crystal ◽  
Phase Modulation ◽  
Binary Phase ◽  
Liquid Crystal Television

Experimental verification of a computer model for optimizing a liquid crystal TV for spatial phase modulation

1998 ◽  
Author(s):  
Mark C. Gardner ◽  
Robin E. Kilpatrick ◽  
Sally E. Day ◽  
Robert E. Renton ◽  
David R. Selviah
Keyword(s):  
Liquid Crystal ◽  
Computer Model ◽  
Experimental Verification ◽  
Phase Modulation ◽  
Spatial Phase

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.

Interferometric analysis of self-phase-modulation at 10.6μm in a nematic liquid crystal

2003 ◽  
Author(s):  
Enrico Allaria ◽  
Stefano Brugioni ◽  
Sergio M. De Nicola ◽  
Pietro Ferraro ◽  
Simonetta Grilli ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Phase Modulation ◽  
Self Phase Modulation
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