Effect of oblique incidence on the optical engine of extinction ratio

Wu, Linghao; Zhang, Guoyu; Sun, Gaofei; Liu, S.; Zhang, Jian; Yang, Junjie; Wang, Hao

doi:10.1016/j.ijleo.2019.164037

Optik

2020

DOI: 10.1016/j.ijleo.2019.164037

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Effect of oblique incidence on the optical engine of extinction ratio

Linghao Wu

Guoyu Zhang

Gaofei Sun

et al.

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2024

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Cited by 2 publications

References 12 publications

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Research on the background stray light suppression method of a dim target projector based on the orthogonal polarization extinction principle

Peng,

Sun,

Zhang

et al. 2024

Opt. Express

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Aiming at the problem of background stray light affecting the display of dim target scenes in existing projectors, a stray light suppression optical engine based on a polarizer is proposed. First, the effect of the background stray light of traditional LCOS target projectors on the display of dim targets is analyzed with simulation, and the sources of stray light in the target projector were analyzed as well. Secondly, we theoretically analyze the causes of different stray light paths and stray light polarization states, propose the method of stray light suppression based on the polarizer, and calculate the rotation angle of the polarizer. Then, we simulate and analyze the stray light suppression effect of the polarizer-based target projector model. Finally, a dim target projector test experiment system is built to verify the actual level of stray light suppression. The simulation results show that the highest stray light energy of the target projector with the polarizer-based stray light suppression optical engine has decreased by 2.37 times compared to the conventional LCOS target projector, the stray light coefficient has decreased from the previous 2.12% to 0.60%, and the simulated contrast ratio has been improved by 2.98 times. The experimental results show that the polarizer-based stray light suppression optical engine is able to reduce the peak gray level of the background stray light energy of the projected display image of the target projector by nearly 2 times, and improve the contrast of the gray level by 2.79 times. The suppression of dim target projector background stray light and the improvement of the contrast of the projected display image are realized.

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Research on the background stray light suppression method of a dim target projector based on the orthogonal polarization extinction principle

Peng,

Sun,

Zhang

et al. 2024

Opt. Express

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Research on polarization effect suppression method of weak starlight simulation device

Wu,

Wang,

Sheng

et al. 2024

Opt. Express

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Under the influence of the polarization effect, the background stray light of the weak starlight simulator and the polarization state of the simulated target star point are doped with each other, so it is difficult to achieve accurate suppression of polarized stray light. In this paper, the mechanism of background stray light induced by the optical engine in a weak starlight simulation device is analyzed, and the principle of mutual doping between stray light and simulated target starlight polarization state is studied. The correlation model of polarization parameters, point source transmittal, and simulated target magnitude was established, and the optimization process of polarization effect was constructed to achieve accurate suppression of polarized stray light in the star map background. The simulation results show that after the optimization of the optical engine, the maximum point source transmittivity is 6.084 × 10−6, which meets the 6-magnitude star accurate recognition threshold. The experimental results show that the stray light suppression ability of the weak starlight simulation device is improved by nearly 2 times, and the magnitude simulation accuracy is improved by 1.8 times.

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Effect of oblique incidence on the optical engine of extinction ratio

Cited by 2 publications

References 12 publications

Research on the background stray light suppression method of a dim target projector based on the orthogonal polarization extinction principle

Research on the background stray light suppression method of a dim target projector based on the orthogonal polarization extinction principle

Research on polarization effect suppression method of weak starlight simulation device

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