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

PLUTO / PLUTO-2 Spatial Light Modulators
Adaptive Optics / Wavefront Control Misc.: Speckle / Characterization / Metrology
Published on:
Authors: Zeng, Zhen; Li, Zexiao; Fang, Fengzhou & Zhang, Xiaodong
Abstract:
“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.”

Open Access

Publication: Sensors
Issue/Year: Sensors, Volume 21; Number 3; Pages 967; 2021
DOI: 10.3390/s21030967
Link: https://doi.org/10.3390/s21030967

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