Dr. Pan Zhang Profile

Dr. Pan Zhang

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Proceedings Article | 28 February 2021 Paper

Auto-optimized compensation of pixel alignment in digital optical phase conjugation system

Pan Zhang, Zhan Li, Lu Han, Shuaishuai Yang, Dean Liu, Jianqiang Zhu

Proceedings Volume 11781, 117810D (2021) https://doi.org/10.1117/12.2591315

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We propose a method for auto-optimized compensation of pixel alignment and overall curvature in digital optical phase conjugation system named AOC-DOPC system. The theory of the AOC-DOPC system is described, and the optimized compensation capability of AOC-DOPC system is verified experimentally in the situation of system instability, overall curvature and pixel match misalignment. With the proposed system, the compensation effect is improved, the size and shape of the focus are more similar to the target pattern. Compared with the DOPC, the PIB curve showed a decrease from 0.162 to 0.007 of area ratio of 50% energy with AOC-DOPC compensation, which is about 16 times relative to the DOPC compensation. Besides, the correlation coefficient (R) increases from 0.0465 to 0.7743, which shows 3.4 times of improvement of compensation effect.

Proceedings Article | 28 February 2021 Paper

High efficiency vector beam generation method based on a single LCSLM

Lu Han, Zhan Li, Pan Zhang, Dean Liu

Proceedings Volume 11781, 117811V (2021) https://doi.org/10.1117/12.2590962

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In this paper, a high efficiency method to generate vector beam based on a single liquid crystal spatial light modulator (LCSLM) is proposed. In this method, the system used to generate vector beam adopts a collinear configuration which makes the system more stable and the core components of the system include a half-wave plate, a reflective phase-only LCSLM and a quarter-wave plate. With the proposed system, the polarization states distribution of output beam could be modulated by controlling the phase pattern displayed on LCSLM and the relative intensity of the two orthogonal components in the beam reflected by LCSLM. We conducted a theoretical analysis of the method and demonstrated the validity and feasibility of the method experimentally. The experiment results are highly consistent with the results obtained through theoretical simulations.

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