Prof. Xiaoquan Sun Profile

Prof. Xiaoquan Sun

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Publications (3)

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Proceedings Article | 18 December 2023 Paper

Laser protection performance of a wavefront encoding imaging system with a tangent phase mask

Yangliang Li, Qing Ye, Yunlong Wu, Hao Zhang, Haoqi Luo, Xiaoquan Sun

Proceedings Volume 12967, 1296708 (2023) https://doi.org/10.1117/12.3006313

KEYWORDS: Imaging systems, Image sensors, Modulation

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Wavefront encoding is an efficient way to extend the depth of focus of optical imaging systems, and its core component, the phase mask, determines its performance in extending the depth of focus. It is worth noting that wavefront coding technology is also an important method for laser protection. On the one hand, its optical field modulation effect realizes the redistribution of laser energy at the imaging plane, reduces the maximum single-pixel received power, and improves the laser blinding protection capability of the imaging system; on the other hand, its out-of-focus imaging plane can reduce the echo detection received power, and achieves the goal of improving the laser reconnaissance protection capability while ensuring the imaging quality. This article presents a laser transmission model for the tangent phase plate wavefront coding imaging system while exploring its protective performance at varying defocus distances to verify its laser protection potential. The findings show that the system offers efficient protective capabilities, as the maximum single-pixel receiving power decreases by an order of magnitude, and the echo detection receiving power reduces nearly three orders of magnitude. Further, the study assesses the protective performance of the system at different propagation distances. The results indicate that when propagation distances vary between 100 m and 10,000 m, the maximum single-pixel receiving power of the wavefront coding imaging system decreases rapidly and then stabilizes, whereas the echo detection receiving power rapidly decreases to approximately 0 mW. Through systematic simulation, the study successfully explores the laser protection performance of the tangent phase mask wavefront coding imaging system, verifying its effectiveness.

Proceedings Article | 18 December 2019 Paper

A review on the retroreflection reduction techniques

Lei Wang, Qing Ye, Xiaoquan Sun

Proceedings Volume 11338, 113380Q (2019) https://doi.org/10.1117/12.2542103

KEYWORDS: Imaging systems, Retroreflectors, Optical filters, Reconnaissance, Image filtering, Bandpass filters, Computational imaging

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Retroreflection, which is also known as the cat-eye effect, occurs in many imaging systems. The laser beam that irradiates on the focused photodetector would be reflected along its entranceway, by means of which the focused imaging system could be easily discovered and located. The paper analyzes the present research status of retroreflection reduction techniques. It shows that the related techniques mainly focus on four aspects: defocusing, masking, filtering, and one-way optical device. However, there are still some apparent disadvantages among the above technical schemes, which are generally manifested in the severe loss of imaging quality and the restricted application scope. Along with the rapid development of parallel computing platforms in recent years, computational imaging is widely applied in many fields. The paper proposes two novel configurations of anti-laser reconnaissance imaging systems based on the wavefront coding and the light-field rendering. Applying the computational imaging techniques will hopefully achieve a substantial retroreflection reduction without severely degrading the imaging quality, which shows us a broad prospect.

SPIE Journal Paper | 15 October 2019

Anti-cat-eye effect imaging technique based on the light-field imaging technique

Lei Wang, Qing Ye, Xianan Dou, Jinsong Nie, Xiaoquan Sun

JEI, Vol. 28, Issue 05, 053020, (October 2019) https://doi.org/10.1117/12.10.1117/1.JEI.28.5.053020

KEYWORDS: Imaging systems, Retroreflectors, Sensors, Microlens array, Reconnaissance, Microlens, Image sensors, Sun, Diffraction, Cameras

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Based on previous anti-cat-eye effect imaging techniques sacrificing too much imaging quality to achieve substantial retroreflection reduction, an anti-cat-eye effect imaging technique based on light-field imaging is proposed. Relevant studies have been carried out regarding the mechanism and effectiveness of both antilaser reconnaissance and blinding for this technique. By applying the Fresnel–Kirchhoff diffraction theory and defining the microlens array as a superposition of a series of microlens units, the retroreflection formation of the light-field imaging system is theoretically modeled. Based on the physical model, the influences of defocusing on the intensity distributions of spots on both the light-field detector and observation planes are further studied. The results show that, compared with a conventional system with the defocus invariant and flexible reconstruction properties, the light-field imaging system not only increases the interference and blinding thresholds by nearly one order of magnitude but also reduces both the retroreflection maximum intensity and the echo-detector receiving power by more than one order of magnitude, which sufficiently manifests the superior antilaser reconnaissance and blinding performances of the light-field imaging system.

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