Measurement of additional phase modulation of an amplitude liquid crystal spatial light modulator HoloEye LC 2002 by dual-beam interferometric method

2018 ◽  
Author(s):  
Vitaly V. Krasnov ◽  
Dmitriy S. Goncharov ◽  
Nikolay N. Ponomarev ◽  
Rostislav S. Starikov
Keyword(s):  
Liquid Crystal ◽  
Phase Modulation ◽  
Spatial Light Modulator ◽  
Light Modulator ◽  
Interferometric Method ◽  
Dual Beam ◽  
Additional Phase

scholarly journals The influence of additional phase modulation of an amplitude liquid crystal STLM on the image recognition characteristics in the invariant optical digital correlator

2019 ◽  
Vol 43 (2) ◽  
pp. 200-208 ◽  
Author(s):  
D.S. Goncharov ◽  
N.N. Evtikhiev ◽  
V.V. Krasnov ◽  
N.M. Ponomarev ◽  
R.S. Starikov
Keyword(s):  
Liquid Crystal ◽  
Phase Shift ◽  
Phase Modulation ◽  
Spatial Light Modulator ◽  
Correlation Energy ◽  
Correlation Filters ◽  
Light Modulator ◽  
Recognition Error ◽  
Digital Correlator ◽  
Additional Phase

We present the results of measurements of additional phase modulation characteristics of a serial amplitude liquid crystal spatial light modulator HoloEye LC 2002. It is found in which way the phase shift of the liquid crystal spatial light modulator depends on the applied signal. The mathematical simulation of the performance of an invariant diffractive optical-digital correlator based on a liquid crystal spatial light modulator with the amplitude-dependent phase shift is carried out using previously measured data. The correlation filters used in the work are an optimal tradeoff maximum average correlation height filter and a minimum noise and correlation energy optical correlation filter. A method for correlation filters optimization was proposed to compensate for the recognition error caused by the presence of the additional phase modulation. In some cases, the optimization allows one not only to compensate for the recognition error, but also to reduce it.

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.

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.

Investigation on Pure Phase Modulation Characteristics of Liquid Crystal Spatial Light Modulator at Oblique Incidence

2016 ◽  
Vol 43 (1) ◽  
pp. 0112001
Author(s):  
鲁强 Lu Qiang ◽  
盛磊 Sheng Lei ◽  
张鑫 Zhang Xin ◽  
白继清 Bai Jiqing ◽  
乔彦峰 Qiao Yanfeng
Keyword(s):  
Liquid Crystal ◽  
Phase Modulation ◽  
Oblique Incidence ◽  
Spatial Light Modulator ◽  
Light Modulator ◽  
Pure Phase

Self-Interference for Spatial Light Modulator Phase Modulation Characteristics by Liquid Crystal Grating

2017 ◽  
Vol 54 (6) ◽  
pp. 061204
Author(s):  
赵自新 Zhao Zixin ◽  
肖昭贤 Xiao Zhaoxian ◽  
张航瑛 Zhang Hangying ◽  
赵 宏 Zhao Hong
Keyword(s):  
Liquid Crystal ◽  
Phase Modulation ◽  
Spatial Light Modulator ◽  
Light Modulator ◽  
Liquid Crystal Grating
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