A Robust and Fast Polarimeter Based on Spatial Phase Modulation of Liquid Crystal on Silicon (LCoS)

2015 ◽  
Author(s):  
Zhikun Hong ◽  
Lei Zhu ◽  
Songnian Fu ◽  
Ming Tang ◽  
P. Shum ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Phase Modulation ◽  
Spatial Phase ◽  
Liquid Crystal On Silicon

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.

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

1999 ◽  
Vol 1 (2) ◽  
pp. 299-303 ◽  
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 ◽  
Liquid Crystal Display ◽  
Spatial Phase

scholarly journals Implementation of 10-Bit Phase Modulation for Phase-Only LCOS Devices Using Deep Learning

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Yuan Tong ◽  
Mike Pivnenko ◽  
Daping Chu
Keyword(s):  
Deep Learning ◽  
Liquid Crystal ◽  
Phase Modulation ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
Spatial Information ◽  
Learning Model ◽  
High Definition ◽  
Liquid Crystal On Silicon ◽  
Deep Learning Model

A deep learning model was built to optimize the phase flicker performance for given pulse width modulation (PWM) driving patterns of a liquid crystal on silicon (LCOS) device. 10-bit phase modulation was physically realized with a phase flicker of 0.055% over 1024 addressed phase levels in respect to the total modulation range of 2π and a separation probability of 62.63% for the phase to stay within its level without overlapping with the adjacent ones. The spatial information bandwidth of the full high-definition (HD) LCOS device at 100 Hz was improved by 25%, from ~1.6 Gb/sec to ~2 Gb/sec.

scholarly journals Study on Aided Optical Alignment by Programmable Spots Array Generated by Off-Axis Parabolic Phase Based on LCoS-SLM

2020 ◽  
Vol 10 (23) ◽  
pp. 8382
Author(s):  
Zhen Zeng ◽  
Zexiao Li ◽  
Fengzhou Fang ◽  
Xiaodong Zhang
Keyword(s):  
Liquid Crystal ◽  
Optical System ◽  
Phase Modulation ◽  
Spatial Light Modulator ◽  
Incident Light ◽  
Alignment Method ◽  
Light Modulator ◽  
Optical Alignment ◽  
Liquid Crystal On Silicon

We present an aided optical alignment method using the liquid crystal on silicon spatial light modulator (LCoS-SLM). An optical system composed of an interferometer and an LCoS-SLM was established to verify the effectiveness of the method. The system was also calibrated to solve the phase modulation nonlinear and nonuniformity problem for better performance of LCoS-SLM as an easily programmable phase compensator. The LCoS-SLM could modulate the phase of incident light precisely to generate an accurate phase desired to achieve a virtual off-axis parabolic phase to generate light spots array. Finally, the 2 × 2 light spots array generated by the optical system was used to verify its potential in optical alignment.

scholarly journals Liquid Crystal Spatial Light Modulator with Optimized Phase Modulation Ranges to Display Multiorder Diffractive Elements

2019 ◽  
Vol 9 (13) ◽  
pp. 2592 ◽  
Author(s):  
Elisabet Pérez-Cabré ◽  
María Sagrario Millán
Keyword(s):  
Liquid Crystal ◽  
Phase Modulation ◽  
Spatial Light Modulator ◽  
Visible Spectrum ◽  
Chromatic Aberration ◽  
Light Modulator ◽  
Optical Elements ◽  
First Order ◽  
Large Phase ◽  
Liquid Crystal On Silicon

A liquid crystal on silicon spatial light modulator (LCoS SLM) with large phase modulation has been thoroughly characterized to operate optimally with several linear phase modulation ranges (π, 2π, 3π, 4π, 6π, and 8π) for an intermediate wavelength of the visible spectrum (λG = 530 nm). For each range, the device response was also measured for two additional wavelengths at the blue and red extremes of the visible spectrum (λB = 476 nm and λR = 647 nm). Multiorder diffractive optical elements, displayed on the LCoS SLM with the appropriate phase modulation range, allowed us to deal with some widely known encoding issues of conventional first-order diffractive lenses such as undersampling and longitudinal chromatic aberration. We designed an achromatic multiorder lens and implemented it experimentally on the SLM. As a result, the residual chromatic aberration reduces to one-third that of the chromatic aberration of a conventional first-order diffractive lens.

scholarly journals Wave-aberration control with a liquid crystal on silicon (LCOS) spatial phase modulator

2009 ◽  
Vol 17 (13) ◽  
pp. 11013 ◽  
Author(s):  
Enrique J. Fernández ◽  
Pedro M. Prieto ◽  
Pablo Artal
Keyword(s):  
Liquid Crystal ◽  
Phase Modulator ◽  
Spatial Phase ◽  
Liquid Crystal On Silicon ◽  
Wave Aberration
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