Liquid crystal on silicon spatial light modulator for infrared scene generation

In order to calibrate the spatial phase response nonuniformity of liquid crystal on silicon (LCoS), we propose to use a Twyman-Green interferometer to characterize the wavefront distortion, due to the inherent curvature of the device. During the characterization, both the residual carrier frequency introduced by the Fourier transform evaluation method and the lens aberration are error sources. For the tilted phase error introduced by residual carrier frequency, the least mean square fitting method is used to obtain the tilted phase error. Meanwhile, we use Zernike polynomials fitting based on plane mirror calibration to mitigate the lens aberration. For a typical LCoS with 1×12,288 pixels after calibration, the peak-to-valley value of the inherent wavefront distortion is approximately 0.25λ at 1550 nm, leading to a half-suppression of wavefront distortion. All efforts can suppress the root mean squares value of the inherent wavefront distortion to approximately λ/34.

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多谱段复杂红外场景模拟技术

Li Zhuo,

Gao Yanze,

Zhang Jinying

2023

光学学报

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Liquid crystal on silicon spatial light modulator for infrared scene generation

Cited by 3 publications

References 4 publications

Photoinduced opaque effect model for light down-converter of dynamic infrared scene projection

Photoinduced opaque effect model for light down-converter of dynamic infrared scene projection

Precise calibration of spatial phase response nonuniformity arising in liquid crystal on silicon

多谱段复杂红外场景模拟技术

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